Abstract

A direct diode laser was built with > 800 W output power at 940 nm to 980 nm. The radiation is coupled into a 100 µm fiber and the NA ex fiber is 0.17. The laser system is based on pump modules that are wavelength stabilized by VBGs. Dense and coarse wavelength multiplexing are realized with commercially available ultra-steep dielectric filters. The electro-optical efficiency is above 30%. Based on a detailed analysis of losses, an improved e-o-efficiency in the range of 40% to 45% is expected in the near future. System performance and reliability were demonstrated with sheet metal cutting tests on stainless steel with a thickness of 4.2 mm.

© 2016 Optical Society of America

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References

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2016 (6)

J. Skidmore, M. Peters, V. Rossin, J. Guo, Y. Xiao, J. Cheng, A. Shieh, R. Srinivasan, J. Singh, C. Wei, R. Duesterberg, J. J. Morehead, and E. Zucker, “Advances in high-power 9XXnm laser diodes for pumping fiber lasers,” Proc. SPIE 9733, 97330B (2016).

F. Ferrario, H. Fritsche, A. Grohe, T. Hagen, H. Kern, R. Koch, B. Kruschke, A. Reich, D. Sanftleben, R. Steger, T. Wallendorf, and W. Gries, “Building block diode laser concept for high brightness laser output in the kW range and its applications,” Proc. SPIE 9733, 97330G (2016).
[Crossref]

Y. Kasai, S. Sakamoto, Y. Takahashi, K. Katagiri, Y. Yamagata, A. Sakamoto, and D. Tanaka, “High-brightness laser diode module over 300W with 100μm/Na 0.22 fiber,” Proc. SPIE 9733, 973309 (2016).
[Crossref]

U. Witte, M. Traub, A. Di Meo, M. Hamann, D. Rubel, S. Hengesbach, and D. Hoffmann, “Compact 35 µm fiber coupled diode laser module based on dense wavelength division multiplexing of NBA mini-bars,” Proc. SPIE 9733, 97330H (2016).
[Crossref]

S. Hengesbach, S. Klein, C. Holly, U. Witte, M. Traub, and D. Hoffmann, “Simultaneous frequency stabilization and high-power dense wavelength division multiplexing (HP-DWDM) using an external cavity based on volume Bragg gratings (VBGs),” Proc. SPIE 9733, 97330K (2016).
[Crossref]

D. Bonsendorf, S. Schneider, J. Meinschien, and J. W. Tomm, “Reliability of high power laser diodes with external optical feedback,” Proc. SPIE 9733, 973302 (2016).
[Crossref]

2015 (2)

B. Leonhäuser, H. Kissel, J. W. Tomm, M. Hempel, A. Unger, and J. Biesenbach, “High-power diode lasers under external optical feedback,” Proc. SPIE 9348, 93480M (2015).

A. Unger, R. Uthoff, M. Stoiber, T. Brand, H. Kissel, B. Köhler, and J. Biesenbach, “Tailored bar concepts for 10mm-mrad fiber coupled modules scalable to kW-class direct diode lasers,” Proc. SPIE 9348, 934809 (2015).
[Crossref]

2014 (3)

D. Belforte, “Fiber laser revenues boost the 2013 laser market,” J. Indust. Laser Sol. 29(01), 6–9 (2014), http://www.industrial-lasers.com/articles/print/volume-29/issue-1/features/fiber-laser-revenues-boost-the-2013-laser-market.html .

G. C. Rodrigues, H. Vanhove, and J. R. Duflou, “Direct diode lasers for industrial laser cutting: A performance comparison with conventional fiber and CO2 technologies,” J. Phys. Procedia 56, 901–908 (2014).
[Crossref]

S. Hengesbach, C. Holly, N. Krauch, U. Witte, T. Westphalen, M. Traub, and D. Hoffmann, “High-power dense wavelength division multiplexing (HP-DWDM) of frequency stabilized 9xx diode laser bars with a channel spacing of 1.5 nm,” Proc. SPIE 8965, 89650C (2014).
[Crossref]

2013 (2)

C. Holly, S. Hengesbach, M. Traub, and D. Hoffmann, “Simulation of spectral stabilization of high-power broad-area edge emitting semiconductor lasers,” Opt. Express 21(13), 15553–15567 (2013).
[Crossref] [PubMed]

S. Heinemann, H. Fritsche, B. Kruschke, T. Schmidt, and W. Gries, “Compact high brightness diode laser emitting 500W from a 100μm fiber,” Proc. SPIE 8605, 86050Q (2013).
[Crossref]

2011 (2)

R. K. Huang, B. Chann, and J. D. Glenn, “Ultra-high brightness wavelength-stabilized kW-class fiber coupled diode laser,” Proc. SPIE 7918, 791810 (2011).
[Crossref]

P. Leisher, M. Reynolds, A. Brown, K. Kennedy, L. Bao, J. Wang, M. Grimshaw, M. DeVito, S. Karlsen, J. Small, C. Ebert, R. Martinsen, and J. Haden, “Reliability of high power diode laser systems based on single emitters,” Proc. SPIE 7918, 791802 (2011).
[Crossref]

2010 (2)

K. Price, S. Karlsen, P. Leisher, and R. Martinsen, “High-brightness fiber-coupled pump laser development,” Proc. SPIE 7583, 758308 (2010).
[Crossref]

P. Crump, A. Pietrzak, F. Bugge, H. Wenzel, G. Erbert, and G. Tränkle, “975 nm high power diode lasers with high efficiency and narrow vertical far field enabled by low index quantum barrier,” Appl. Phys. Lett. 96(13), 131110 (2010).
[Crossref]

2006 (2)

Ban, V. S.

Bao, L.

P. Leisher, M. Reynolds, A. Brown, K. Kennedy, L. Bao, J. Wang, M. Grimshaw, M. DeVito, S. Karlsen, J. Small, C. Ebert, R. Martinsen, and J. Haden, “Reliability of high power diode laser systems based on single emitters,” Proc. SPIE 7918, 791802 (2011).
[Crossref]

Belforte, D.

D. Belforte, “Fiber laser revenues boost the 2013 laser market,” J. Indust. Laser Sol. 29(01), 6–9 (2014), http://www.industrial-lasers.com/articles/print/volume-29/issue-1/features/fiber-laser-revenues-boost-the-2013-laser-market.html .

Biesenbach, J.

A. Unger, R. Uthoff, M. Stoiber, T. Brand, H. Kissel, B. Köhler, and J. Biesenbach, “Tailored bar concepts for 10mm-mrad fiber coupled modules scalable to kW-class direct diode lasers,” Proc. SPIE 9348, 934809 (2015).
[Crossref]

B. Leonhäuser, H. Kissel, J. W. Tomm, M. Hempel, A. Unger, and J. Biesenbach, “High-power diode lasers under external optical feedback,” Proc. SPIE 9348, 93480M (2015).

Bonsendorf, D.

D. Bonsendorf, S. Schneider, J. Meinschien, and J. W. Tomm, “Reliability of high power laser diodes with external optical feedback,” Proc. SPIE 9733, 973302 (2016).
[Crossref]

Brand, T.

A. Unger, R. Uthoff, M. Stoiber, T. Brand, H. Kissel, B. Köhler, and J. Biesenbach, “Tailored bar concepts for 10mm-mrad fiber coupled modules scalable to kW-class direct diode lasers,” Proc. SPIE 9348, 934809 (2015).
[Crossref]

Brown, A.

P. Leisher, M. Reynolds, A. Brown, K. Kennedy, L. Bao, J. Wang, M. Grimshaw, M. DeVito, S. Karlsen, J. Small, C. Ebert, R. Martinsen, and J. Haden, “Reliability of high power diode laser systems based on single emitters,” Proc. SPIE 7918, 791802 (2011).
[Crossref]

Bugge, F.

P. Crump, A. Pietrzak, F. Bugge, H. Wenzel, G. Erbert, and G. Tränkle, “975 nm high power diode lasers with high efficiency and narrow vertical far field enabled by low index quantum barrier,” Appl. Phys. Lett. 96(13), 131110 (2010).
[Crossref]

Chann, B.

Cheng, J.

J. Skidmore, M. Peters, V. Rossin, J. Guo, Y. Xiao, J. Cheng, A. Shieh, R. Srinivasan, J. Singh, C. Wei, R. Duesterberg, J. J. Morehead, and E. Zucker, “Advances in high-power 9XXnm laser diodes for pumping fiber lasers,” Proc. SPIE 9733, 97330B (2016).

Crump, P.

P. Crump, A. Pietrzak, F. Bugge, H. Wenzel, G. Erbert, and G. Tränkle, “975 nm high power diode lasers with high efficiency and narrow vertical far field enabled by low index quantum barrier,” Appl. Phys. Lett. 96(13), 131110 (2010).
[Crossref]

DeVito, M.

P. Leisher, M. Reynolds, A. Brown, K. Kennedy, L. Bao, J. Wang, M. Grimshaw, M. DeVito, S. Karlsen, J. Small, C. Ebert, R. Martinsen, and J. Haden, “Reliability of high power diode laser systems based on single emitters,” Proc. SPIE 7918, 791802 (2011).
[Crossref]

Di Meo, A.

U. Witte, M. Traub, A. Di Meo, M. Hamann, D. Rubel, S. Hengesbach, and D. Hoffmann, “Compact 35 µm fiber coupled diode laser module based on dense wavelength division multiplexing of NBA mini-bars,” Proc. SPIE 9733, 97330H (2016).
[Crossref]

Duesterberg, R.

J. Skidmore, M. Peters, V. Rossin, J. Guo, Y. Xiao, J. Cheng, A. Shieh, R. Srinivasan, J. Singh, C. Wei, R. Duesterberg, J. J. Morehead, and E. Zucker, “Advances in high-power 9XXnm laser diodes for pumping fiber lasers,” Proc. SPIE 9733, 97330B (2016).

Duflou, J. R.

G. C. Rodrigues, H. Vanhove, and J. R. Duflou, “Direct diode lasers for industrial laser cutting: A performance comparison with conventional fiber and CO2 technologies,” J. Phys. Procedia 56, 901–908 (2014).
[Crossref]

Ebert, C.

P. Leisher, M. Reynolds, A. Brown, K. Kennedy, L. Bao, J. Wang, M. Grimshaw, M. DeVito, S. Karlsen, J. Small, C. Ebert, R. Martinsen, and J. Haden, “Reliability of high power diode laser systems based on single emitters,” Proc. SPIE 7918, 791802 (2011).
[Crossref]

Erbert, G.

P. Crump, A. Pietrzak, F. Bugge, H. Wenzel, G. Erbert, and G. Tränkle, “975 nm high power diode lasers with high efficiency and narrow vertical far field enabled by low index quantum barrier,” Appl. Phys. Lett. 96(13), 131110 (2010).
[Crossref]

Fan, T. Y.

Ferrario, F.

F. Ferrario, H. Fritsche, A. Grohe, T. Hagen, H. Kern, R. Koch, B. Kruschke, A. Reich, D. Sanftleben, R. Steger, T. Wallendorf, and W. Gries, “Building block diode laser concept for high brightness laser output in the kW range and its applications,” Proc. SPIE 9733, 97330G (2016).
[Crossref]

Fritsche, H.

F. Ferrario, H. Fritsche, A. Grohe, T. Hagen, H. Kern, R. Koch, B. Kruschke, A. Reich, D. Sanftleben, R. Steger, T. Wallendorf, and W. Gries, “Building block diode laser concept for high brightness laser output in the kW range and its applications,” Proc. SPIE 9733, 97330G (2016).
[Crossref]

S. Heinemann, H. Fritsche, B. Kruschke, T. Schmidt, and W. Gries, “Compact high brightness diode laser emitting 500W from a 100μm fiber,” Proc. SPIE 8605, 86050Q (2013).
[Crossref]

Glenn, J. D.

R. K. Huang, B. Chann, and J. D. Glenn, “Ultra-high brightness wavelength-stabilized kW-class fiber coupled diode laser,” Proc. SPIE 7918, 791810 (2011).
[Crossref]

Goyal, A. K.

Gries, W.

F. Ferrario, H. Fritsche, A. Grohe, T. Hagen, H. Kern, R. Koch, B. Kruschke, A. Reich, D. Sanftleben, R. Steger, T. Wallendorf, and W. Gries, “Building block diode laser concept for high brightness laser output in the kW range and its applications,” Proc. SPIE 9733, 97330G (2016).
[Crossref]

S. Heinemann, H. Fritsche, B. Kruschke, T. Schmidt, and W. Gries, “Compact high brightness diode laser emitting 500W from a 100μm fiber,” Proc. SPIE 8605, 86050Q (2013).
[Crossref]

Grimshaw, M.

P. Leisher, M. Reynolds, A. Brown, K. Kennedy, L. Bao, J. Wang, M. Grimshaw, M. DeVito, S. Karlsen, J. Small, C. Ebert, R. Martinsen, and J. Haden, “Reliability of high power diode laser systems based on single emitters,” Proc. SPIE 7918, 791802 (2011).
[Crossref]

Grohe, A.

F. Ferrario, H. Fritsche, A. Grohe, T. Hagen, H. Kern, R. Koch, B. Kruschke, A. Reich, D. Sanftleben, R. Steger, T. Wallendorf, and W. Gries, “Building block diode laser concept for high brightness laser output in the kW range and its applications,” Proc. SPIE 9733, 97330G (2016).
[Crossref]

Guo, J.

J. Skidmore, M. Peters, V. Rossin, J. Guo, Y. Xiao, J. Cheng, A. Shieh, R. Srinivasan, J. Singh, C. Wei, R. Duesterberg, J. J. Morehead, and E. Zucker, “Advances in high-power 9XXnm laser diodes for pumping fiber lasers,” Proc. SPIE 9733, 97330B (2016).

Haden, J.

P. Leisher, M. Reynolds, A. Brown, K. Kennedy, L. Bao, J. Wang, M. Grimshaw, M. DeVito, S. Karlsen, J. Small, C. Ebert, R. Martinsen, and J. Haden, “Reliability of high power diode laser systems based on single emitters,” Proc. SPIE 7918, 791802 (2011).
[Crossref]

Hagen, T.

F. Ferrario, H. Fritsche, A. Grohe, T. Hagen, H. Kern, R. Koch, B. Kruschke, A. Reich, D. Sanftleben, R. Steger, T. Wallendorf, and W. Gries, “Building block diode laser concept for high brightness laser output in the kW range and its applications,” Proc. SPIE 9733, 97330G (2016).
[Crossref]

Hamann, M.

U. Witte, M. Traub, A. Di Meo, M. Hamann, D. Rubel, S. Hengesbach, and D. Hoffmann, “Compact 35 µm fiber coupled diode laser module based on dense wavelength division multiplexing of NBA mini-bars,” Proc. SPIE 9733, 97330H (2016).
[Crossref]

Heinemann, S.

S. Heinemann, H. Fritsche, B. Kruschke, T. Schmidt, and W. Gries, “Compact high brightness diode laser emitting 500W from a 100μm fiber,” Proc. SPIE 8605, 86050Q (2013).
[Crossref]

Hempel, M.

B. Leonhäuser, H. Kissel, J. W. Tomm, M. Hempel, A. Unger, and J. Biesenbach, “High-power diode lasers under external optical feedback,” Proc. SPIE 9348, 93480M (2015).

Hengesbach, S.

S. Hengesbach, S. Klein, C. Holly, U. Witte, M. Traub, and D. Hoffmann, “Simultaneous frequency stabilization and high-power dense wavelength division multiplexing (HP-DWDM) using an external cavity based on volume Bragg gratings (VBGs),” Proc. SPIE 9733, 97330K (2016).
[Crossref]

U. Witte, M. Traub, A. Di Meo, M. Hamann, D. Rubel, S. Hengesbach, and D. Hoffmann, “Compact 35 µm fiber coupled diode laser module based on dense wavelength division multiplexing of NBA mini-bars,” Proc. SPIE 9733, 97330H (2016).
[Crossref]

S. Hengesbach, C. Holly, N. Krauch, U. Witte, T. Westphalen, M. Traub, and D. Hoffmann, “High-power dense wavelength division multiplexing (HP-DWDM) of frequency stabilized 9xx diode laser bars with a channel spacing of 1.5 nm,” Proc. SPIE 8965, 89650C (2014).
[Crossref]

C. Holly, S. Hengesbach, M. Traub, and D. Hoffmann, “Simulation of spectral stabilization of high-power broad-area edge emitting semiconductor lasers,” Opt. Express 21(13), 15553–15567 (2013).
[Crossref] [PubMed]

Hoffmann, D.

S. Hengesbach, S. Klein, C. Holly, U. Witte, M. Traub, and D. Hoffmann, “Simultaneous frequency stabilization and high-power dense wavelength division multiplexing (HP-DWDM) using an external cavity based on volume Bragg gratings (VBGs),” Proc. SPIE 9733, 97330K (2016).
[Crossref]

U. Witte, M. Traub, A. Di Meo, M. Hamann, D. Rubel, S. Hengesbach, and D. Hoffmann, “Compact 35 µm fiber coupled diode laser module based on dense wavelength division multiplexing of NBA mini-bars,” Proc. SPIE 9733, 97330H (2016).
[Crossref]

S. Hengesbach, C. Holly, N. Krauch, U. Witte, T. Westphalen, M. Traub, and D. Hoffmann, “High-power dense wavelength division multiplexing (HP-DWDM) of frequency stabilized 9xx diode laser bars with a channel spacing of 1.5 nm,” Proc. SPIE 8965, 89650C (2014).
[Crossref]

C. Holly, S. Hengesbach, M. Traub, and D. Hoffmann, “Simulation of spectral stabilization of high-power broad-area edge emitting semiconductor lasers,” Opt. Express 21(13), 15553–15567 (2013).
[Crossref] [PubMed]

C. Wessling, M. Traub, D. Hoffmann, and R. Poprawe, “Dense wavelength multiplexing for a high power diode laser,” Proc. SPIE 6104, 61040O (2006).
[Crossref]

Holly, C.

S. Hengesbach, S. Klein, C. Holly, U. Witte, M. Traub, and D. Hoffmann, “Simultaneous frequency stabilization and high-power dense wavelength division multiplexing (HP-DWDM) using an external cavity based on volume Bragg gratings (VBGs),” Proc. SPIE 9733, 97330K (2016).
[Crossref]

S. Hengesbach, C. Holly, N. Krauch, U. Witte, T. Westphalen, M. Traub, and D. Hoffmann, “High-power dense wavelength division multiplexing (HP-DWDM) of frequency stabilized 9xx diode laser bars with a channel spacing of 1.5 nm,” Proc. SPIE 8965, 89650C (2014).
[Crossref]

C. Holly, S. Hengesbach, M. Traub, and D. Hoffmann, “Simulation of spectral stabilization of high-power broad-area edge emitting semiconductor lasers,” Opt. Express 21(13), 15553–15567 (2013).
[Crossref] [PubMed]

Huang, R. K.

R. K. Huang, B. Chann, and J. D. Glenn, “Ultra-high brightness wavelength-stabilized kW-class fiber coupled diode laser,” Proc. SPIE 7918, 791810 (2011).
[Crossref]

Karlsen, S.

P. Leisher, M. Reynolds, A. Brown, K. Kennedy, L. Bao, J. Wang, M. Grimshaw, M. DeVito, S. Karlsen, J. Small, C. Ebert, R. Martinsen, and J. Haden, “Reliability of high power diode laser systems based on single emitters,” Proc. SPIE 7918, 791802 (2011).
[Crossref]

K. Price, S. Karlsen, P. Leisher, and R. Martinsen, “High-brightness fiber-coupled pump laser development,” Proc. SPIE 7583, 758308 (2010).
[Crossref]

Kasai, Y.

Y. Kasai, S. Sakamoto, Y. Takahashi, K. Katagiri, Y. Yamagata, A. Sakamoto, and D. Tanaka, “High-brightness laser diode module over 300W with 100μm/Na 0.22 fiber,” Proc. SPIE 9733, 973309 (2016).
[Crossref]

Katagiri, K.

Y. Kasai, S. Sakamoto, Y. Takahashi, K. Katagiri, Y. Yamagata, A. Sakamoto, and D. Tanaka, “High-brightness laser diode module over 300W with 100μm/Na 0.22 fiber,” Proc. SPIE 9733, 973309 (2016).
[Crossref]

Kennedy, K.

P. Leisher, M. Reynolds, A. Brown, K. Kennedy, L. Bao, J. Wang, M. Grimshaw, M. DeVito, S. Karlsen, J. Small, C. Ebert, R. Martinsen, and J. Haden, “Reliability of high power diode laser systems based on single emitters,” Proc. SPIE 7918, 791802 (2011).
[Crossref]

Kern, H.

F. Ferrario, H. Fritsche, A. Grohe, T. Hagen, H. Kern, R. Koch, B. Kruschke, A. Reich, D. Sanftleben, R. Steger, T. Wallendorf, and W. Gries, “Building block diode laser concept for high brightness laser output in the kW range and its applications,” Proc. SPIE 9733, 97330G (2016).
[Crossref]

Kissel, H.

B. Leonhäuser, H. Kissel, J. W. Tomm, M. Hempel, A. Unger, and J. Biesenbach, “High-power diode lasers under external optical feedback,” Proc. SPIE 9348, 93480M (2015).

A. Unger, R. Uthoff, M. Stoiber, T. Brand, H. Kissel, B. Köhler, and J. Biesenbach, “Tailored bar concepts for 10mm-mrad fiber coupled modules scalable to kW-class direct diode lasers,” Proc. SPIE 9348, 934809 (2015).
[Crossref]

Klein, S.

S. Hengesbach, S. Klein, C. Holly, U. Witte, M. Traub, and D. Hoffmann, “Simultaneous frequency stabilization and high-power dense wavelength division multiplexing (HP-DWDM) using an external cavity based on volume Bragg gratings (VBGs),” Proc. SPIE 9733, 97330K (2016).
[Crossref]

Koch, R.

F. Ferrario, H. Fritsche, A. Grohe, T. Hagen, H. Kern, R. Koch, B. Kruschke, A. Reich, D. Sanftleben, R. Steger, T. Wallendorf, and W. Gries, “Building block diode laser concept for high brightness laser output in the kW range and its applications,” Proc. SPIE 9733, 97330G (2016).
[Crossref]

Köhler, B.

A. Unger, R. Uthoff, M. Stoiber, T. Brand, H. Kissel, B. Köhler, and J. Biesenbach, “Tailored bar concepts for 10mm-mrad fiber coupled modules scalable to kW-class direct diode lasers,” Proc. SPIE 9348, 934809 (2015).
[Crossref]

Krauch, N.

S. Hengesbach, C. Holly, N. Krauch, U. Witte, T. Westphalen, M. Traub, and D. Hoffmann, “High-power dense wavelength division multiplexing (HP-DWDM) of frequency stabilized 9xx diode laser bars with a channel spacing of 1.5 nm,” Proc. SPIE 8965, 89650C (2014).
[Crossref]

Kruschke, B.

F. Ferrario, H. Fritsche, A. Grohe, T. Hagen, H. Kern, R. Koch, B. Kruschke, A. Reich, D. Sanftleben, R. Steger, T. Wallendorf, and W. Gries, “Building block diode laser concept for high brightness laser output in the kW range and its applications,” Proc. SPIE 9733, 97330G (2016).
[Crossref]

S. Heinemann, H. Fritsche, B. Kruschke, T. Schmidt, and W. Gries, “Compact high brightness diode laser emitting 500W from a 100μm fiber,” Proc. SPIE 8605, 86050Q (2013).
[Crossref]

Leisher, P.

P. Leisher, M. Reynolds, A. Brown, K. Kennedy, L. Bao, J. Wang, M. Grimshaw, M. DeVito, S. Karlsen, J. Small, C. Ebert, R. Martinsen, and J. Haden, “Reliability of high power diode laser systems based on single emitters,” Proc. SPIE 7918, 791802 (2011).
[Crossref]

K. Price, S. Karlsen, P. Leisher, and R. Martinsen, “High-brightness fiber-coupled pump laser development,” Proc. SPIE 7583, 758308 (2010).
[Crossref]

Leonhäuser, B.

B. Leonhäuser, H. Kissel, J. W. Tomm, M. Hempel, A. Unger, and J. Biesenbach, “High-power diode lasers under external optical feedback,” Proc. SPIE 9348, 93480M (2015).

Martinsen, R.

P. Leisher, M. Reynolds, A. Brown, K. Kennedy, L. Bao, J. Wang, M. Grimshaw, M. DeVito, S. Karlsen, J. Small, C. Ebert, R. Martinsen, and J. Haden, “Reliability of high power diode laser systems based on single emitters,” Proc. SPIE 7918, 791802 (2011).
[Crossref]

K. Price, S. Karlsen, P. Leisher, and R. Martinsen, “High-brightness fiber-coupled pump laser development,” Proc. SPIE 7583, 758308 (2010).
[Crossref]

Meinschien, J.

D. Bonsendorf, S. Schneider, J. Meinschien, and J. W. Tomm, “Reliability of high power laser diodes with external optical feedback,” Proc. SPIE 9733, 973302 (2016).
[Crossref]

Morehead, J. J.

J. Skidmore, M. Peters, V. Rossin, J. Guo, Y. Xiao, J. Cheng, A. Shieh, R. Srinivasan, J. Singh, C. Wei, R. Duesterberg, J. J. Morehead, and E. Zucker, “Advances in high-power 9XXnm laser diodes for pumping fiber lasers,” Proc. SPIE 9733, 97330B (2016).

Peters, M.

J. Skidmore, M. Peters, V. Rossin, J. Guo, Y. Xiao, J. Cheng, A. Shieh, R. Srinivasan, J. Singh, C. Wei, R. Duesterberg, J. J. Morehead, and E. Zucker, “Advances in high-power 9XXnm laser diodes for pumping fiber lasers,” Proc. SPIE 9733, 97330B (2016).

Pietrzak, A.

P. Crump, A. Pietrzak, F. Bugge, H. Wenzel, G. Erbert, and G. Tränkle, “975 nm high power diode lasers with high efficiency and narrow vertical far field enabled by low index quantum barrier,” Appl. Phys. Lett. 96(13), 131110 (2010).
[Crossref]

Poprawe, R.

C. Wessling, M. Traub, D. Hoffmann, and R. Poprawe, “Dense wavelength multiplexing for a high power diode laser,” Proc. SPIE 6104, 61040O (2006).
[Crossref]

Price, K.

K. Price, S. Karlsen, P. Leisher, and R. Martinsen, “High-brightness fiber-coupled pump laser development,” Proc. SPIE 7583, 758308 (2010).
[Crossref]

Reich, A.

F. Ferrario, H. Fritsche, A. Grohe, T. Hagen, H. Kern, R. Koch, B. Kruschke, A. Reich, D. Sanftleben, R. Steger, T. Wallendorf, and W. Gries, “Building block diode laser concept for high brightness laser output in the kW range and its applications,” Proc. SPIE 9733, 97330G (2016).
[Crossref]

Reynolds, M.

P. Leisher, M. Reynolds, A. Brown, K. Kennedy, L. Bao, J. Wang, M. Grimshaw, M. DeVito, S. Karlsen, J. Small, C. Ebert, R. Martinsen, and J. Haden, “Reliability of high power diode laser systems based on single emitters,” Proc. SPIE 7918, 791802 (2011).
[Crossref]

Rodrigues, G. C.

G. C. Rodrigues, H. Vanhove, and J. R. Duflou, “Direct diode lasers for industrial laser cutting: A performance comparison with conventional fiber and CO2 technologies,” J. Phys. Procedia 56, 901–908 (2014).
[Crossref]

Rossin, V.

J. Skidmore, M. Peters, V. Rossin, J. Guo, Y. Xiao, J. Cheng, A. Shieh, R. Srinivasan, J. Singh, C. Wei, R. Duesterberg, J. J. Morehead, and E. Zucker, “Advances in high-power 9XXnm laser diodes for pumping fiber lasers,” Proc. SPIE 9733, 97330B (2016).

Rubel, D.

U. Witte, M. Traub, A. Di Meo, M. Hamann, D. Rubel, S. Hengesbach, and D. Hoffmann, “Compact 35 µm fiber coupled diode laser module based on dense wavelength division multiplexing of NBA mini-bars,” Proc. SPIE 9733, 97330H (2016).
[Crossref]

Sakamoto, A.

Y. Kasai, S. Sakamoto, Y. Takahashi, K. Katagiri, Y. Yamagata, A. Sakamoto, and D. Tanaka, “High-brightness laser diode module over 300W with 100μm/Na 0.22 fiber,” Proc. SPIE 9733, 973309 (2016).
[Crossref]

Sakamoto, S.

Y. Kasai, S. Sakamoto, Y. Takahashi, K. Katagiri, Y. Yamagata, A. Sakamoto, and D. Tanaka, “High-brightness laser diode module over 300W with 100μm/Na 0.22 fiber,” Proc. SPIE 9733, 973309 (2016).
[Crossref]

Sanchez-Rubio, A.

Sanftleben, D.

F. Ferrario, H. Fritsche, A. Grohe, T. Hagen, H. Kern, R. Koch, B. Kruschke, A. Reich, D. Sanftleben, R. Steger, T. Wallendorf, and W. Gries, “Building block diode laser concept for high brightness laser output in the kW range and its applications,” Proc. SPIE 9733, 97330G (2016).
[Crossref]

Schmidt, T.

S. Heinemann, H. Fritsche, B. Kruschke, T. Schmidt, and W. Gries, “Compact high brightness diode laser emitting 500W from a 100μm fiber,” Proc. SPIE 8605, 86050Q (2013).
[Crossref]

Schneider, S.

D. Bonsendorf, S. Schneider, J. Meinschien, and J. W. Tomm, “Reliability of high power laser diodes with external optical feedback,” Proc. SPIE 9733, 973302 (2016).
[Crossref]

Shieh, A.

J. Skidmore, M. Peters, V. Rossin, J. Guo, Y. Xiao, J. Cheng, A. Shieh, R. Srinivasan, J. Singh, C. Wei, R. Duesterberg, J. J. Morehead, and E. Zucker, “Advances in high-power 9XXnm laser diodes for pumping fiber lasers,” Proc. SPIE 9733, 97330B (2016).

Singh, J.

J. Skidmore, M. Peters, V. Rossin, J. Guo, Y. Xiao, J. Cheng, A. Shieh, R. Srinivasan, J. Singh, C. Wei, R. Duesterberg, J. J. Morehead, and E. Zucker, “Advances in high-power 9XXnm laser diodes for pumping fiber lasers,” Proc. SPIE 9733, 97330B (2016).

Skidmore, J.

J. Skidmore, M. Peters, V. Rossin, J. Guo, Y. Xiao, J. Cheng, A. Shieh, R. Srinivasan, J. Singh, C. Wei, R. Duesterberg, J. J. Morehead, and E. Zucker, “Advances in high-power 9XXnm laser diodes for pumping fiber lasers,” Proc. SPIE 9733, 97330B (2016).

Small, J.

P. Leisher, M. Reynolds, A. Brown, K. Kennedy, L. Bao, J. Wang, M. Grimshaw, M. DeVito, S. Karlsen, J. Small, C. Ebert, R. Martinsen, and J. Haden, “Reliability of high power diode laser systems based on single emitters,” Proc. SPIE 7918, 791802 (2011).
[Crossref]

Srinivasan, R.

J. Skidmore, M. Peters, V. Rossin, J. Guo, Y. Xiao, J. Cheng, A. Shieh, R. Srinivasan, J. Singh, C. Wei, R. Duesterberg, J. J. Morehead, and E. Zucker, “Advances in high-power 9XXnm laser diodes for pumping fiber lasers,” Proc. SPIE 9733, 97330B (2016).

Steger, R.

F. Ferrario, H. Fritsche, A. Grohe, T. Hagen, H. Kern, R. Koch, B. Kruschke, A. Reich, D. Sanftleben, R. Steger, T. Wallendorf, and W. Gries, “Building block diode laser concept for high brightness laser output in the kW range and its applications,” Proc. SPIE 9733, 97330G (2016).
[Crossref]

Stoiber, M.

A. Unger, R. Uthoff, M. Stoiber, T. Brand, H. Kissel, B. Köhler, and J. Biesenbach, “Tailored bar concepts for 10mm-mrad fiber coupled modules scalable to kW-class direct diode lasers,” Proc. SPIE 9348, 934809 (2015).
[Crossref]

Takahashi, Y.

Y. Kasai, S. Sakamoto, Y. Takahashi, K. Katagiri, Y. Yamagata, A. Sakamoto, and D. Tanaka, “High-brightness laser diode module over 300W with 100μm/Na 0.22 fiber,” Proc. SPIE 9733, 973309 (2016).
[Crossref]

Tanaka, D.

Y. Kasai, S. Sakamoto, Y. Takahashi, K. Katagiri, Y. Yamagata, A. Sakamoto, and D. Tanaka, “High-brightness laser diode module over 300W with 100μm/Na 0.22 fiber,” Proc. SPIE 9733, 973309 (2016).
[Crossref]

Tomm, J. W.

D. Bonsendorf, S. Schneider, J. Meinschien, and J. W. Tomm, “Reliability of high power laser diodes with external optical feedback,” Proc. SPIE 9733, 973302 (2016).
[Crossref]

B. Leonhäuser, H. Kissel, J. W. Tomm, M. Hempel, A. Unger, and J. Biesenbach, “High-power diode lasers under external optical feedback,” Proc. SPIE 9348, 93480M (2015).

Tränkle, G.

P. Crump, A. Pietrzak, F. Bugge, H. Wenzel, G. Erbert, and G. Tränkle, “975 nm high power diode lasers with high efficiency and narrow vertical far field enabled by low index quantum barrier,” Appl. Phys. Lett. 96(13), 131110 (2010).
[Crossref]

Traub, M.

U. Witte, M. Traub, A. Di Meo, M. Hamann, D. Rubel, S. Hengesbach, and D. Hoffmann, “Compact 35 µm fiber coupled diode laser module based on dense wavelength division multiplexing of NBA mini-bars,” Proc. SPIE 9733, 97330H (2016).
[Crossref]

S. Hengesbach, S. Klein, C. Holly, U. Witte, M. Traub, and D. Hoffmann, “Simultaneous frequency stabilization and high-power dense wavelength division multiplexing (HP-DWDM) using an external cavity based on volume Bragg gratings (VBGs),” Proc. SPIE 9733, 97330K (2016).
[Crossref]

S. Hengesbach, C. Holly, N. Krauch, U. Witte, T. Westphalen, M. Traub, and D. Hoffmann, “High-power dense wavelength division multiplexing (HP-DWDM) of frequency stabilized 9xx diode laser bars with a channel spacing of 1.5 nm,” Proc. SPIE 8965, 89650C (2014).
[Crossref]

C. Holly, S. Hengesbach, M. Traub, and D. Hoffmann, “Simulation of spectral stabilization of high-power broad-area edge emitting semiconductor lasers,” Opt. Express 21(13), 15553–15567 (2013).
[Crossref] [PubMed]

C. Wessling, M. Traub, D. Hoffmann, and R. Poprawe, “Dense wavelength multiplexing for a high power diode laser,” Proc. SPIE 6104, 61040O (2006).
[Crossref]

Unger, A.

A. Unger, R. Uthoff, M. Stoiber, T. Brand, H. Kissel, B. Köhler, and J. Biesenbach, “Tailored bar concepts for 10mm-mrad fiber coupled modules scalable to kW-class direct diode lasers,” Proc. SPIE 9348, 934809 (2015).
[Crossref]

B. Leonhäuser, H. Kissel, J. W. Tomm, M. Hempel, A. Unger, and J. Biesenbach, “High-power diode lasers under external optical feedback,” Proc. SPIE 9348, 93480M (2015).

Uthoff, R.

A. Unger, R. Uthoff, M. Stoiber, T. Brand, H. Kissel, B. Köhler, and J. Biesenbach, “Tailored bar concepts for 10mm-mrad fiber coupled modules scalable to kW-class direct diode lasers,” Proc. SPIE 9348, 934809 (2015).
[Crossref]

Vanhove, H.

G. C. Rodrigues, H. Vanhove, and J. R. Duflou, “Direct diode lasers for industrial laser cutting: A performance comparison with conventional fiber and CO2 technologies,” J. Phys. Procedia 56, 901–908 (2014).
[Crossref]

Volodin, B. L.

Wallendorf, T.

F. Ferrario, H. Fritsche, A. Grohe, T. Hagen, H. Kern, R. Koch, B. Kruschke, A. Reich, D. Sanftleben, R. Steger, T. Wallendorf, and W. Gries, “Building block diode laser concept for high brightness laser output in the kW range and its applications,” Proc. SPIE 9733, 97330G (2016).
[Crossref]

Wang, J.

P. Leisher, M. Reynolds, A. Brown, K. Kennedy, L. Bao, J. Wang, M. Grimshaw, M. DeVito, S. Karlsen, J. Small, C. Ebert, R. Martinsen, and J. Haden, “Reliability of high power diode laser systems based on single emitters,” Proc. SPIE 7918, 791802 (2011).
[Crossref]

Wei, C.

J. Skidmore, M. Peters, V. Rossin, J. Guo, Y. Xiao, J. Cheng, A. Shieh, R. Srinivasan, J. Singh, C. Wei, R. Duesterberg, J. J. Morehead, and E. Zucker, “Advances in high-power 9XXnm laser diodes for pumping fiber lasers,” Proc. SPIE 9733, 97330B (2016).

Wenzel, H.

P. Crump, A. Pietrzak, F. Bugge, H. Wenzel, G. Erbert, and G. Tränkle, “975 nm high power diode lasers with high efficiency and narrow vertical far field enabled by low index quantum barrier,” Appl. Phys. Lett. 96(13), 131110 (2010).
[Crossref]

Wessling, C.

C. Wessling, M. Traub, D. Hoffmann, and R. Poprawe, “Dense wavelength multiplexing for a high power diode laser,” Proc. SPIE 6104, 61040O (2006).
[Crossref]

Westphalen, T.

S. Hengesbach, C. Holly, N. Krauch, U. Witte, T. Westphalen, M. Traub, and D. Hoffmann, “High-power dense wavelength division multiplexing (HP-DWDM) of frequency stabilized 9xx diode laser bars with a channel spacing of 1.5 nm,” Proc. SPIE 8965, 89650C (2014).
[Crossref]

Witte, U.

U. Witte, M. Traub, A. Di Meo, M. Hamann, D. Rubel, S. Hengesbach, and D. Hoffmann, “Compact 35 µm fiber coupled diode laser module based on dense wavelength division multiplexing of NBA mini-bars,” Proc. SPIE 9733, 97330H (2016).
[Crossref]

S. Hengesbach, S. Klein, C. Holly, U. Witte, M. Traub, and D. Hoffmann, “Simultaneous frequency stabilization and high-power dense wavelength division multiplexing (HP-DWDM) using an external cavity based on volume Bragg gratings (VBGs),” Proc. SPIE 9733, 97330K (2016).
[Crossref]

S. Hengesbach, C. Holly, N. Krauch, U. Witte, T. Westphalen, M. Traub, and D. Hoffmann, “High-power dense wavelength division multiplexing (HP-DWDM) of frequency stabilized 9xx diode laser bars with a channel spacing of 1.5 nm,” Proc. SPIE 8965, 89650C (2014).
[Crossref]

Xiao, Y.

J. Skidmore, M. Peters, V. Rossin, J. Guo, Y. Xiao, J. Cheng, A. Shieh, R. Srinivasan, J. Singh, C. Wei, R. Duesterberg, J. J. Morehead, and E. Zucker, “Advances in high-power 9XXnm laser diodes for pumping fiber lasers,” Proc. SPIE 9733, 97330B (2016).

Yamagata, Y.

Y. Kasai, S. Sakamoto, Y. Takahashi, K. Katagiri, Y. Yamagata, A. Sakamoto, and D. Tanaka, “High-brightness laser diode module over 300W with 100μm/Na 0.22 fiber,” Proc. SPIE 9733, 973309 (2016).
[Crossref]

Zucker, E.

J. Skidmore, M. Peters, V. Rossin, J. Guo, Y. Xiao, J. Cheng, A. Shieh, R. Srinivasan, J. Singh, C. Wei, R. Duesterberg, J. J. Morehead, and E. Zucker, “Advances in high-power 9XXnm laser diodes for pumping fiber lasers,” Proc. SPIE 9733, 97330B (2016).

Appl. Phys. Lett. (1)

P. Crump, A. Pietrzak, F. Bugge, H. Wenzel, G. Erbert, and G. Tränkle, “975 nm high power diode lasers with high efficiency and narrow vertical far field enabled by low index quantum barrier,” Appl. Phys. Lett. 96(13), 131110 (2010).
[Crossref]

J. Indust. Laser Sol. (1)

D. Belforte, “Fiber laser revenues boost the 2013 laser market,” J. Indust. Laser Sol. 29(01), 6–9 (2014), http://www.industrial-lasers.com/articles/print/volume-29/issue-1/features/fiber-laser-revenues-boost-the-2013-laser-market.html .

J. Phys. Procedia (1)

G. C. Rodrigues, H. Vanhove, and J. R. Duflou, “Direct diode lasers for industrial laser cutting: A performance comparison with conventional fiber and CO2 technologies,” J. Phys. Procedia 56, 901–908 (2014).
[Crossref]

Opt. Express (1)

Opt. Lett. (1)

Proc. SPIE (14)

S. Heinemann, H. Fritsche, B. Kruschke, T. Schmidt, and W. Gries, “Compact high brightness diode laser emitting 500W from a 100μm fiber,” Proc. SPIE 8605, 86050Q (2013).
[Crossref]

A. Unger, R. Uthoff, M. Stoiber, T. Brand, H. Kissel, B. Köhler, and J. Biesenbach, “Tailored bar concepts for 10mm-mrad fiber coupled modules scalable to kW-class direct diode lasers,” Proc. SPIE 9348, 934809 (2015).
[Crossref]

U. Witte, M. Traub, A. Di Meo, M. Hamann, D. Rubel, S. Hengesbach, and D. Hoffmann, “Compact 35 µm fiber coupled diode laser module based on dense wavelength division multiplexing of NBA mini-bars,” Proc. SPIE 9733, 97330H (2016).
[Crossref]

S. Hengesbach, S. Klein, C. Holly, U. Witte, M. Traub, and D. Hoffmann, “Simultaneous frequency stabilization and high-power dense wavelength division multiplexing (HP-DWDM) using an external cavity based on volume Bragg gratings (VBGs),” Proc. SPIE 9733, 97330K (2016).
[Crossref]

S. Hengesbach, C. Holly, N. Krauch, U. Witte, T. Westphalen, M. Traub, and D. Hoffmann, “High-power dense wavelength division multiplexing (HP-DWDM) of frequency stabilized 9xx diode laser bars with a channel spacing of 1.5 nm,” Proc. SPIE 8965, 89650C (2014).
[Crossref]

K. Price, S. Karlsen, P. Leisher, and R. Martinsen, “High-brightness fiber-coupled pump laser development,” Proc. SPIE 7583, 758308 (2010).
[Crossref]

J. Skidmore, M. Peters, V. Rossin, J. Guo, Y. Xiao, J. Cheng, A. Shieh, R. Srinivasan, J. Singh, C. Wei, R. Duesterberg, J. J. Morehead, and E. Zucker, “Advances in high-power 9XXnm laser diodes for pumping fiber lasers,” Proc. SPIE 9733, 97330B (2016).

R. K. Huang, B. Chann, and J. D. Glenn, “Ultra-high brightness wavelength-stabilized kW-class fiber coupled diode laser,” Proc. SPIE 7918, 791810 (2011).
[Crossref]

F. Ferrario, H. Fritsche, A. Grohe, T. Hagen, H. Kern, R. Koch, B. Kruschke, A. Reich, D. Sanftleben, R. Steger, T. Wallendorf, and W. Gries, “Building block diode laser concept for high brightness laser output in the kW range and its applications,” Proc. SPIE 9733, 97330G (2016).
[Crossref]

P. Leisher, M. Reynolds, A. Brown, K. Kennedy, L. Bao, J. Wang, M. Grimshaw, M. DeVito, S. Karlsen, J. Small, C. Ebert, R. Martinsen, and J. Haden, “Reliability of high power diode laser systems based on single emitters,” Proc. SPIE 7918, 791802 (2011).
[Crossref]

D. Bonsendorf, S. Schneider, J. Meinschien, and J. W. Tomm, “Reliability of high power laser diodes with external optical feedback,” Proc. SPIE 9733, 973302 (2016).
[Crossref]

B. Leonhäuser, H. Kissel, J. W. Tomm, M. Hempel, A. Unger, and J. Biesenbach, “High-power diode lasers under external optical feedback,” Proc. SPIE 9348, 93480M (2015).

C. Wessling, M. Traub, D. Hoffmann, and R. Poprawe, “Dense wavelength multiplexing for a high power diode laser,” Proc. SPIE 6104, 61040O (2006).
[Crossref]

Y. Kasai, S. Sakamoto, Y. Takahashi, K. Katagiri, Y. Yamagata, A. Sakamoto, and D. Tanaka, “High-brightness laser diode module over 300W with 100μm/Na 0.22 fiber,” Proc. SPIE 9733, 973309 (2016).
[Crossref]

Other (12)

Laserline, „Technical data LDF,“ (2016), http://www.laserline.de/technische-daten-ldf.html .

R. K. Huang, B. Samson, B. Chann, B. Lochman, and P. Tayebati, “Recent progress on high-brightness kW-class direct diode lasers,” in Proc.of IEEE Conf. on High Power Diode Lasers and Systems (IEEE, 2015), pp. 29–30.
[Crossref]

M. Wood, ”Laser beam technology development and application,” presented at the 7th Alta Brillanza Workshop, Milano, Italy, 24–25 Sep. 2015.

H. Zimer, M. Haas, S. Nagel, M. Ginter, S. Ried, S. Rauch, A. Killi, and S. Heinemann, “Spectrally stabilized and combined diode lasers,” in Proc.of IEEE Conf. on High Power Diode Lasers and Systems (IEEE, 2015), pp. 31–32.
[Crossref]

A. Siewert, “Multi-Core Fibre Lasers with High Performance and High Efficiency,” presented at the 11th AKL – International Laser Technology Congress, Aachen, Germany, 27–29 Apr. 2016.

Datasheet, “e12-12-120-0976-3-105-0.22-SI-FPT-2.0-HT,” (2016), http://www.nlight.net/nlight-files/file/DatasheetsV2/element/9xx/(e12_1200976105)%20e12-12-120-0976-3-105-0_22-SI-FPT-2_0-HT.pdf .

Datasheet, “976nm, 270W, 225µm Ø, Fiber-Coupled, Multi-Bar Module Based Conduction-Cooled, Tailored Mini-Bars,” (2016), http://dilas.com/assets/media/products/DILAS_MMF_TBar_IS58_270W_976nm.pdf .

P. Unger, “Introduction to Power Diode Lasers,” in High-Power Diode Lasers: Fundamentals, Technology, Applications, R. Diehl, ed. (Springer, 2000).

http://www.bystronic.ch/de/produkte/laserschneidsysteme/ByLaser.php

Trumpf Brochure, “TruLaser: Cost-effective cutting through thick and thin,” (2016), http://www.trumpf-machines.com/index.php?eID=tx_nawsecuredl&u=0&file=fileadmin/DAM/trumpf-machines.com/Produkte/Prospekte/TruLaser_04_2016_ENG.pdf&t=1465232907&hash=69efefb44829c48f3c5faeb85599d5c7 .

P. Loosen, “High Power Diode Lasers,” in High-Power Diode Lasers: Fundamentals, Technology, Applications, R. Diehl, ed. (Springer, 2000).

V. Krause, “Entwicklung der Leistung und des Wirkungsgrades von Diodenlasern höchster Leistung,” presented at the 11th AKL – International Laser Technology Congress, Aachen, Germany, 27–29 Apr. 2016.

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Figures (13)

Fig. 1
Fig. 1

Left: Principle of wavelength multiplexing. Right: Comparison of CWM (dotted) and DWDM (solid). The decreased spectral width δλ enables a decreased spectral spacing Δλ. Hence more lasers can be multiplexed in the same wavelength interval (here 5 instead of 2).

Fig. 2
Fig. 2

Laser applications as a function of optical power and beam parameter product in 1998 [16]. The sweet spot indicates where standard machines are sold today by market leaders Bystronic and Trumpf [14,15].

Fig. 3
Fig. 3

Some commercially available high power fiber coupled diode lasers based on conventional spatial combining, coarse wavelength beam combining and DWDM (in 2015).

Fig. 4
Fig. 4

Left: Schematic combining scheme. Right: Ray-tracing model.

Fig. 5
Fig. 5

Left: Spectrum of 944 nm submodule for different operating currents with cooling water temperature of 50°C. Right: Integrated intensity (power content) of 936 nm submodule operated at 19°C cooling water temperature.

Fig. 6
Fig. 6

Left: Optical output power and electro optical efficiency for 2 different diode laser modules. Right: Correlation between the energy that is encircled between the band edges of the corresponding filters and the multiplexing efficiency. The relatively low efficiency for the 940 nm submodule at low operating currents can be clearly attributed to side lobes in the spectrum.

Fig. 7
Fig. 7

Left: Efficiency of polarization coupling. Right: Intensity distribution after polarization coupler and beam shaping.

Fig. 8
Fig. 8

Left: Fiber coupling efficiency. Right: Intensity distribution in focal plane.

Fig. 9
Fig. 9

Left: Optical power and efficiencies (ηe-o: electro-optical; ηopt-opt: optical to optical) for the final kW-demonstrator. The injection current is the sum of the injection currents for the two individual controllable subunits (94x nm and 97x nm). Right: Power content against NA.

Fig. 10
Fig. 10

Center wavelength and spectral width for 95% power content (error bars) for two externally stabilized single emitters with different front facet coatings. The epitaxial design of the single emitters (SE) was optimized for external wavelength stabilization with an “extremely low divergence” (ELOD) in the vertical axis of 30° (95% PC) [31]. A monolithic VBG-FAC is used for stabilization.

Fig. 11
Fig. 11

Laboratory diode laser system on a breadboard in mobile flow-box for cutting experiments. The pump modules are manufactured by DILAS.

Fig. 12
Fig. 12

Left: Maximum cutting speed as a function of the material thickness for stainless steel. Right: Sheet metal cutting experiment (stainless steel, d = 2.5 mm, v = 18 mm/s, nozzle diameter dn = 2 mm, nozzle distance d = 0.5 mm, N2 gas pressure p = 12 bar). The optical power at the work piece is 630 W. 16% power losses occur in the optics due to an overfilling of the NA (≈6%) and AR-coatings for 1070 nm (≈10%) as a standard cutting head for fiber lasers are used.

Fig. 13
Fig. 13

Cut edge for 2.5 mm (left) and 1 mm (right) stainless steel.

Tables (1)

Tables Icon

Table 1 DWDM technologies - without any claim to completeness. “SE-based” indicates that the (sub-) modules are based on single emitters.

Equations (6)

Equations on this page are rendered with MathJax. Learn more.

χ PC = λ BE,1 λ BE,2 I( λ )dλ I( λ )dλ .
η MP = P MP P module,i .
η MP,χ = η MP,max ( χ+ 1 χ MP N ).
η CWM = P beh,PC P beh,CWM .
η FC = P ex100µm P beh,CWM .
η optopt = P ex100µm i=1 6 P i,module .

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