Abstract

We demonstrate that it is possible to pump an Ng-cut Yb:KGW crystal slab with up to 18W by a single emitter laser diode and still achieve a nearly diffraction limited output beam with a M 2 value below M 2<1.1 and optical to optical efficiencies of more than 44%. Furthermore, we have measured the focal length of thermally induced lenses in an Yb:KGW crystal slab which was end-pumped by 12 W and 18 W single-emitter diodes. We have observed that the focal lengths not only depend on the pump power and beam waists, but are also dependent on the specific diode beam profile, as well as the collimation optics. We have been able to correlate this behavior with specific patterns of the beam profile.

© 2008 Optical Society of America

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    [CrossRef] [PubMed]
  3. J. E. Hellstrom, S. Bjurshagen, V. Pasiskevicius, J. Liu, V. Petrov, and U. Griebner, "Efficient Yb:KGW lasers end-pumped by high-power diode bars," Appl. Phys. B 83,235-239 (2006).
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    [CrossRef]
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  18. A. A. Lagatsky, A. Abdolvand, and N. V. Kuleshov, "Passive Q switching and self-frequency Raman conversion in a diode-pumped Yb:KGd(WO4)2 laser," Opt. Lett. 25,616-618 (2000).
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    [CrossRef]
  21. S. Chenais, F. Druon, S. Forget, F. Balembois, and P. Georges, "On thermal effects in solid state lasers: the case of ytterbium-doped materials," http://arxiv.org/ftp/arxiv/papers/0704/0704.0701.pdf.
  22. C. E. Mungan, "Thermodynamics of radiation-balanced lasing," J. Opt. Soc. Am. B 20,1075-1082 (2003).
    [CrossRef]

2007

V. V. Filippov, N. V. Kuleshov, and I. T. Bodnar, "Negative thermo-optical coefficients and athermal directions in monoclinc KGd(WO4)2 and KY(WO4)2 laser host crystals in teh visible region," Appl. Phys. B 87,611-614 (2007).
[CrossRef]

2006

J. E. Hellstr¨om, S. Bjurshagen, and V. Pasiskevicius "Laser performance and thermal lensing in high-power diode-pumped Yb:KGW with athermal orientation," Appl. Phys. B 83,55-59 (2006).
[CrossRef]

G. R. Holtom, "Mode-locked Yb:KGW laser longitudinally pumped by polarization-coupled diode bars," Opt. Lett. 31,2719-2721 (2006).
[CrossRef] [PubMed]

J. E. Hellstrom, S. Bjurshagen, V. Pasiskevicius, J. Liu, V. Petrov, and U. Griebner, "Efficient Yb:KGW lasers end-pumped by high-power diode bars," Appl. Phys. B 83,235-239 (2006).
[CrossRef]

2005

2004

A. A. Lagatsky, C. T. A. Brown, and W. Sibbett, "Highly efficient and low threshold diode-pumped Kerr-lens mode-locked Yb:KYW laser," Opt. Express 12,3928-3933 (2004).
[CrossRef] [PubMed]

S. Ch??enais, F. Balembois, F. Druon, G. Lucas-Leclin, and P. Georges, "Thermal Lensing in Diode-Pumped Ytterbium Lasers - Part I: Theoretical Analysis and Wavefront Measurements," IEEE J. Quantum Electron. 40,1217-1234 (2004).
[CrossRef]

2003

C. E. Mungan, "Thermodynamics of radiation-balanced lasing," J. Opt. Soc. Am. B 20,1075-1082 (2003).
[CrossRef]

2002

2001

G. Erbert, G. Beister, R. Hulsewede, A. Knauer, W. Pittroff, J. Sebastian, H. Wenzel, M. Weyers, and G. Trankle, "High-Power Highly Reliable Al-Free 940-nm Diode Lasers," IEEE J. Sel. Top. Quantum Electron. 7,143-148 (2001).
[CrossRef]

J. Sebastian, G. Beister, F. Bugge, f. Buhrandt, G. Erbert, G. H¨ansel, R. H¨ulsewede, A. Knauer, W. Pittroff, R. Staske, M. Schroder, H. Wenzel, M. Weyers, and G. Tr¨ankle, "High-Power 810-nm GaAsP-AlGaAs Diode Lasers With Narrow Beam Divergence," IEEE J. Sel. Top. Quantum Electron. 7,334-339 (2001).
[CrossRef]

2000

G. Erbert, A. Barwolff, J. Sebastian, and J. Tomm, "High-Power Broad-Area Diode Lasers and Laser Bars," Topics Appl. Phys. 78,172-223 (2000).

A. A. Lagatsky, A. Abdolvand, and N. V. Kuleshov, "Passive Q switching and self-frequency Raman conversion in a diode-pumped Yb:KGd(WO4)2 laser," Opt. Lett. 25,616-618 (2000).
[CrossRef]

1999

C. H¨onninger, R. Paschotta, M. Graf, F. Morier-Genoud, G. Zhang, M. Moser, S. Biswal, J. Nees, A. Braun, G. A. Mourou, I. Johannsen, A. Giessen, W. Seeber, and U. Keller, "Ultrafast ytterbium-doped bulk lasers and laser amplifiers," Appl. Phys. B 69,3-17 (1999).
[CrossRef]

1995

I. V. Mochalov, "Nonlinear optics of the potassium gadolinium tungstate laser crystal Nd3+:KGd(WO4)2," J. Opt. Technol. 62,746-756 (1995).

Abdolvand, A.

Balembois, F.

S. Ch??enais, F. Balembois, F. Druon, G. Lucas-Leclin, and P. Georges, "Thermal Lensing in Diode-Pumped Ytterbium Lasers - Part I: Theoretical Analysis and Wavefront Measurements," IEEE J. Quantum Electron. 40,1217-1234 (2004).
[CrossRef]

Barwolff, A.

G. Erbert, A. Barwolff, J. Sebastian, and J. Tomm, "High-Power Broad-Area Diode Lasers and Laser Bars," Topics Appl. Phys. 78,172-223 (2000).

Beister, G.

J. Sebastian, G. Beister, F. Bugge, f. Buhrandt, G. Erbert, G. H¨ansel, R. H¨ulsewede, A. Knauer, W. Pittroff, R. Staske, M. Schroder, H. Wenzel, M. Weyers, and G. Tr¨ankle, "High-Power 810-nm GaAsP-AlGaAs Diode Lasers With Narrow Beam Divergence," IEEE J. Sel. Top. Quantum Electron. 7,334-339 (2001).
[CrossRef]

G. Erbert, G. Beister, R. Hulsewede, A. Knauer, W. Pittroff, J. Sebastian, H. Wenzel, M. Weyers, and G. Trankle, "High-Power Highly Reliable Al-Free 940-nm Diode Lasers," IEEE J. Sel. Top. Quantum Electron. 7,143-148 (2001).
[CrossRef]

Biswal, S.

S. Biswal, S. P. O??Connor, and S. Steven, "Thermo-optical parameters measured in ytterbium-doped potassium gadolinium tungstate" Appl. Opt. 44,3093-3097 (2005).
[CrossRef] [PubMed]

C. H¨onninger, R. Paschotta, M. Graf, F. Morier-Genoud, G. Zhang, M. Moser, S. Biswal, J. Nees, A. Braun, G. A. Mourou, I. Johannsen, A. Giessen, W. Seeber, and U. Keller, "Ultrafast ytterbium-doped bulk lasers and laser amplifiers," Appl. Phys. B 69,3-17 (1999).
[CrossRef]

Bjurshagen, S.

J. E. Hellstr¨om, S. Bjurshagen, and V. Pasiskevicius "Laser performance and thermal lensing in high-power diode-pumped Yb:KGW with athermal orientation," Appl. Phys. B 83,55-59 (2006).
[CrossRef]

Bjurshfagen, S.

J. E. Hellstrom, S. Bjurshagen, V. Pasiskevicius, J. Liu, V. Petrov, and U. Griebner, "Efficient Yb:KGW lasers end-pumped by high-power diode bars," Appl. Phys. B 83,235-239 (2006).
[CrossRef]

Bodnar, I. T.

V. V. Filippov, N. V. Kuleshov, and I. T. Bodnar, "Negative thermo-optical coefficients and athermal directions in monoclinc KGd(WO4)2 and KY(WO4)2 laser host crystals in teh visible region," Appl. Phys. B 87,611-614 (2007).
[CrossRef]

Braun, A.

C. H¨onninger, R. Paschotta, M. Graf, F. Morier-Genoud, G. Zhang, M. Moser, S. Biswal, J. Nees, A. Braun, G. A. Mourou, I. Johannsen, A. Giessen, W. Seeber, and U. Keller, "Ultrafast ytterbium-doped bulk lasers and laser amplifiers," Appl. Phys. B 69,3-17 (1999).
[CrossRef]

Brown, C. T. A.

Brunner, F.

Bugge, F.

J. Sebastian, G. Beister, F. Bugge, f. Buhrandt, G. Erbert, G. H¨ansel, R. H¨ulsewede, A. Knauer, W. Pittroff, R. Staske, M. Schroder, H. Wenzel, M. Weyers, and G. Tr¨ankle, "High-Power 810-nm GaAsP-AlGaAs Diode Lasers With Narrow Beam Divergence," IEEE J. Sel. Top. Quantum Electron. 7,334-339 (2001).
[CrossRef]

Chenais, S.

S. Ch??enais, F. Balembois, F. Druon, G. Lucas-Leclin, and P. Georges, "Thermal Lensing in Diode-Pumped Ytterbium Lasers - Part I: Theoretical Analysis and Wavefront Measurements," IEEE J. Quantum Electron. 40,1217-1234 (2004).
[CrossRef]

Druon, F.

S. Ch??enais, F. Balembois, F. Druon, G. Lucas-Leclin, and P. Georges, "Thermal Lensing in Diode-Pumped Ytterbium Lasers - Part I: Theoretical Analysis and Wavefront Measurements," IEEE J. Quantum Electron. 40,1217-1234 (2004).
[CrossRef]

Erbert, G.

G. Erbert, G. Beister, R. Hulsewede, A. Knauer, W. Pittroff, J. Sebastian, H. Wenzel, M. Weyers, and G. Trankle, "High-Power Highly Reliable Al-Free 940-nm Diode Lasers," IEEE J. Sel. Top. Quantum Electron. 7,143-148 (2001).
[CrossRef]

G. Erbert, A. Barwolff, J. Sebastian, and J. Tomm, "High-Power Broad-Area Diode Lasers and Laser Bars," Topics Appl. Phys. 78,172-223 (2000).

Filippov, V. V.

V. V. Filippov, N. V. Kuleshov, and I. T. Bodnar, "Negative thermo-optical coefficients and athermal directions in monoclinc KGd(WO4)2 and KY(WO4)2 laser host crystals in teh visible region," Appl. Phys. B 87,611-614 (2007).
[CrossRef]

Georges, P.

S. Ch??enais, F. Balembois, F. Druon, G. Lucas-Leclin, and P. Georges, "Thermal Lensing in Diode-Pumped Ytterbium Lasers - Part I: Theoretical Analysis and Wavefront Measurements," IEEE J. Quantum Electron. 40,1217-1234 (2004).
[CrossRef]

Giessen, A.

C. H¨onninger, R. Paschotta, M. Graf, F. Morier-Genoud, G. Zhang, M. Moser, S. Biswal, J. Nees, A. Braun, G. A. Mourou, I. Johannsen, A. Giessen, W. Seeber, and U. Keller, "Ultrafast ytterbium-doped bulk lasers and laser amplifiers," Appl. Phys. B 69,3-17 (1999).
[CrossRef]

Graf, M.

C. H¨onninger, R. Paschotta, M. Graf, F. Morier-Genoud, G. Zhang, M. Moser, S. Biswal, J. Nees, A. Braun, G. A. Mourou, I. Johannsen, A. Giessen, W. Seeber, and U. Keller, "Ultrafast ytterbium-doped bulk lasers and laser amplifiers," Appl. Phys. B 69,3-17 (1999).
[CrossRef]

Griebner, U.

J. E. Hellstrom, S. Bjurshagen, V. Pasiskevicius, J. Liu, V. Petrov, and U. Griebner, "Efficient Yb:KGW lasers end-pumped by high-power diode bars," Appl. Phys. B 83,235-239 (2006).
[CrossRef]

Hellstr¨om, J. E.

J. E. Hellstr¨om, S. Bjurshagen, and V. Pasiskevicius "Laser performance and thermal lensing in high-power diode-pumped Yb:KGW with athermal orientation," Appl. Phys. B 83,55-59 (2006).
[CrossRef]

Hellstrom, J. E.

J. E. Hellstrom, S. Bjurshagen, V. Pasiskevicius, J. Liu, V. Petrov, and U. Griebner, "Efficient Yb:KGW lasers end-pumped by high-power diode bars," Appl. Phys. B 83,235-239 (2006).
[CrossRef]

Holtom, G. R.

Honninger, C.

C. H¨onninger, R. Paschotta, M. Graf, F. Morier-Genoud, G. Zhang, M. Moser, S. Biswal, J. Nees, A. Braun, G. A. Mourou, I. Johannsen, A. Giessen, W. Seeber, and U. Keller, "Ultrafast ytterbium-doped bulk lasers and laser amplifiers," Appl. Phys. B 69,3-17 (1999).
[CrossRef]

Hulsewede, R.

G. Erbert, G. Beister, R. Hulsewede, A. Knauer, W. Pittroff, J. Sebastian, H. Wenzel, M. Weyers, and G. Trankle, "High-Power Highly Reliable Al-Free 940-nm Diode Lasers," IEEE J. Sel. Top. Quantum Electron. 7,143-148 (2001).
[CrossRef]

Ikegawa, T.

T. Kawashima, T. Kurita, O. Matsumoto, T. Ikegawa, T. Sekine, M. Miyamoto, K Iyama, H. Kan, and Y. Tsuchiya, "20-J Diode-Pumped Zig-Zag Slab Laser with 2-GW Peak Power and 200-W Average Power," ASSP 2005, TuB44 (2005).

Innerhofer, E.

Iyama, K

T. Kawashima, T. Kurita, O. Matsumoto, T. Ikegawa, T. Sekine, M. Miyamoto, K Iyama, H. Kan, and Y. Tsuchiya, "20-J Diode-Pumped Zig-Zag Slab Laser with 2-GW Peak Power and 200-W Average Power," ASSP 2005, TuB44 (2005).

Johannsen, I.

C. H¨onninger, R. Paschotta, M. Graf, F. Morier-Genoud, G. Zhang, M. Moser, S. Biswal, J. Nees, A. Braun, G. A. Mourou, I. Johannsen, A. Giessen, W. Seeber, and U. Keller, "Ultrafast ytterbium-doped bulk lasers and laser amplifiers," Appl. Phys. B 69,3-17 (1999).
[CrossRef]

Kan, H.

T. Kawashima, T. Kurita, O. Matsumoto, T. Ikegawa, T. Sekine, M. Miyamoto, K Iyama, H. Kan, and Y. Tsuchiya, "20-J Diode-Pumped Zig-Zag Slab Laser with 2-GW Peak Power and 200-W Average Power," ASSP 2005, TuB44 (2005).

Kawashima, T.

T. Kawashima, T. Kurita, O. Matsumoto, T. Ikegawa, T. Sekine, M. Miyamoto, K Iyama, H. Kan, and Y. Tsuchiya, "20-J Diode-Pumped Zig-Zag Slab Laser with 2-GW Peak Power and 200-W Average Power," ASSP 2005, TuB44 (2005).

Keller, U.

C. H¨onninger, R. Paschotta, M. Graf, F. Morier-Genoud, G. Zhang, M. Moser, S. Biswal, J. Nees, A. Braun, G. A. Mourou, I. Johannsen, A. Giessen, W. Seeber, and U. Keller, "Ultrafast ytterbium-doped bulk lasers and laser amplifiers," Appl. Phys. B 69,3-17 (1999).
[CrossRef]

Knauer, A.

G. Erbert, G. Beister, R. Hulsewede, A. Knauer, W. Pittroff, J. Sebastian, H. Wenzel, M. Weyers, and G. Trankle, "High-Power Highly Reliable Al-Free 940-nm Diode Lasers," IEEE J. Sel. Top. Quantum Electron. 7,143-148 (2001).
[CrossRef]

Kuleshov, N. V.

V. V. Filippov, N. V. Kuleshov, and I. T. Bodnar, "Negative thermo-optical coefficients and athermal directions in monoclinc KGd(WO4)2 and KY(WO4)2 laser host crystals in teh visible region," Appl. Phys. B 87,611-614 (2007).
[CrossRef]

A. A. Lagatsky, A. Abdolvand, and N. V. Kuleshov, "Passive Q switching and self-frequency Raman conversion in a diode-pumped Yb:KGd(WO4)2 laser," Opt. Lett. 25,616-618 (2000).
[CrossRef]

Kurita, T.

T. Kawashima, T. Kurita, O. Matsumoto, T. Ikegawa, T. Sekine, M. Miyamoto, K Iyama, H. Kan, and Y. Tsuchiya, "20-J Diode-Pumped Zig-Zag Slab Laser with 2-GW Peak Power and 200-W Average Power," ASSP 2005, TuB44 (2005).

Lagatsky, A. A.

Liu, J.

J. E. Hellstrom, S. Bjurshagen, V. Pasiskevicius, J. Liu, V. Petrov, and U. Griebner, "Efficient Yb:KGW lasers end-pumped by high-power diode bars," Appl. Phys. B 83,235-239 (2006).
[CrossRef]

Lucas-Leclin, G.

S. Ch??enais, F. Balembois, F. Druon, G. Lucas-Leclin, and P. Georges, "Thermal Lensing in Diode-Pumped Ytterbium Lasers - Part I: Theoretical Analysis and Wavefront Measurements," IEEE J. Quantum Electron. 40,1217-1234 (2004).
[CrossRef]

Matsumoto, O.

T. Kawashima, T. Kurita, O. Matsumoto, T. Ikegawa, T. Sekine, M. Miyamoto, K Iyama, H. Kan, and Y. Tsuchiya, "20-J Diode-Pumped Zig-Zag Slab Laser with 2-GW Peak Power and 200-W Average Power," ASSP 2005, TuB44 (2005).

Miyamoto, M.

T. Kawashima, T. Kurita, O. Matsumoto, T. Ikegawa, T. Sekine, M. Miyamoto, K Iyama, H. Kan, and Y. Tsuchiya, "20-J Diode-Pumped Zig-Zag Slab Laser with 2-GW Peak Power and 200-W Average Power," ASSP 2005, TuB44 (2005).

Mochalov, I. V.

I. V. Mochalov, "Nonlinear optics of the potassium gadolinium tungstate laser crystal Nd3+:KGd(WO4)2," J. Opt. Technol. 62,746-756 (1995).

Morier-Genoud, F.

F. Brunner, T. Sudmeyer, E. Innerhofer, F. Morier-Genoud, and R. Paschotta, "240-fs pulses with 22-W average power from a mode-locked thin-disk Yb:KY(WO4)2 laser," Opt. Lett. 27,1162-1164 (2002).
[CrossRef]

C. H¨onninger, R. Paschotta, M. Graf, F. Morier-Genoud, G. Zhang, M. Moser, S. Biswal, J. Nees, A. Braun, G. A. Mourou, I. Johannsen, A. Giessen, W. Seeber, and U. Keller, "Ultrafast ytterbium-doped bulk lasers and laser amplifiers," Appl. Phys. B 69,3-17 (1999).
[CrossRef]

Moser, M.

C. H¨onninger, R. Paschotta, M. Graf, F. Morier-Genoud, G. Zhang, M. Moser, S. Biswal, J. Nees, A. Braun, G. A. Mourou, I. Johannsen, A. Giessen, W. Seeber, and U. Keller, "Ultrafast ytterbium-doped bulk lasers and laser amplifiers," Appl. Phys. B 69,3-17 (1999).
[CrossRef]

Mourou, G. A.

C. H¨onninger, R. Paschotta, M. Graf, F. Morier-Genoud, G. Zhang, M. Moser, S. Biswal, J. Nees, A. Braun, G. A. Mourou, I. Johannsen, A. Giessen, W. Seeber, and U. Keller, "Ultrafast ytterbium-doped bulk lasers and laser amplifiers," Appl. Phys. B 69,3-17 (1999).
[CrossRef]

Mungan, C. E.

C. E. Mungan, "Thermodynamics of radiation-balanced lasing," J. Opt. Soc. Am. B 20,1075-1082 (2003).
[CrossRef]

Nees, J.

C. H¨onninger, R. Paschotta, M. Graf, F. Morier-Genoud, G. Zhang, M. Moser, S. Biswal, J. Nees, A. Braun, G. A. Mourou, I. Johannsen, A. Giessen, W. Seeber, and U. Keller, "Ultrafast ytterbium-doped bulk lasers and laser amplifiers," Appl. Phys. B 69,3-17 (1999).
[CrossRef]

O??Connor, S. P.

Paschotta, R.

Paschottach, R.

C. H¨onninger, R. Paschotta, M. Graf, F. Morier-Genoud, G. Zhang, M. Moser, S. Biswal, J. Nees, A. Braun, G. A. Mourou, I. Johannsen, A. Giessen, W. Seeber, and U. Keller, "Ultrafast ytterbium-doped bulk lasers and laser amplifiers," Appl. Phys. B 69,3-17 (1999).
[CrossRef]

Pasiskevicius, V.

J. E. Hellstr¨om, S. Bjurshagen, and V. Pasiskevicius "Laser performance and thermal lensing in high-power diode-pumped Yb:KGW with athermal orientation," Appl. Phys. B 83,55-59 (2006).
[CrossRef]

Pasiskevicius, , V.

J. E. Hellstrom, S. Bjurshagen, V. Pasiskevicius, J. Liu, V. Petrov, and U. Griebner, "Efficient Yb:KGW lasers end-pumped by high-power diode bars," Appl. Phys. B 83,235-239 (2006).
[CrossRef]

Petrov, V.

J. E. Hellstrom, S. Bjurshagen, V. Pasiskevicius, J. Liu, V. Petrov, and U. Griebner, "Efficient Yb:KGW lasers end-pumped by high-power diode bars," Appl. Phys. B 83,235-239 (2006).
[CrossRef]

Pittroff, W.

G. Erbert, G. Beister, R. Hulsewede, A. Knauer, W. Pittroff, J. Sebastian, H. Wenzel, M. Weyers, and G. Trankle, "High-Power Highly Reliable Al-Free 940-nm Diode Lasers," IEEE J. Sel. Top. Quantum Electron. 7,143-148 (2001).
[CrossRef]

Sebastian, J.

G. Erbert, G. Beister, R. Hulsewede, A. Knauer, W. Pittroff, J. Sebastian, H. Wenzel, M. Weyers, and G. Trankle, "High-Power Highly Reliable Al-Free 940-nm Diode Lasers," IEEE J. Sel. Top. Quantum Electron. 7,143-148 (2001).
[CrossRef]

J. Sebastian, G. Beister, F. Bugge, f. Buhrandt, G. Erbert, G. H¨ansel, R. H¨ulsewede, A. Knauer, W. Pittroff, R. Staske, M. Schroder, H. Wenzel, M. Weyers, and G. Tr¨ankle, "High-Power 810-nm GaAsP-AlGaAs Diode Lasers With Narrow Beam Divergence," IEEE J. Sel. Top. Quantum Electron. 7,334-339 (2001).
[CrossRef]

G. Erbert, A. Barwolff, J. Sebastian, and J. Tomm, "High-Power Broad-Area Diode Lasers and Laser Bars," Topics Appl. Phys. 78,172-223 (2000).

Seeber, W.

C. H¨onninger, R. Paschotta, M. Graf, F. Morier-Genoud, G. Zhang, M. Moser, S. Biswal, J. Nees, A. Braun, G. A. Mourou, I. Johannsen, A. Giessen, W. Seeber, and U. Keller, "Ultrafast ytterbium-doped bulk lasers and laser amplifiers," Appl. Phys. B 69,3-17 (1999).
[CrossRef]

Sekine, T.

T. Kawashima, T. Kurita, O. Matsumoto, T. Ikegawa, T. Sekine, M. Miyamoto, K Iyama, H. Kan, and Y. Tsuchiya, "20-J Diode-Pumped Zig-Zag Slab Laser with 2-GW Peak Power and 200-W Average Power," ASSP 2005, TuB44 (2005).

Shiler, M.

Sibbett, W.

Steven, S.

Sudmeyer, T.

Tomm, J.

G. Erbert, A. Barwolff, J. Sebastian, and J. Tomm, "High-Power Broad-Area Diode Lasers and Laser Bars," Topics Appl. Phys. 78,172-223 (2000).

Trankle, G.

G. Erbert, G. Beister, R. Hulsewede, A. Knauer, W. Pittroff, J. Sebastian, H. Wenzel, M. Weyers, and G. Trankle, "High-Power Highly Reliable Al-Free 940-nm Diode Lasers," IEEE J. Sel. Top. Quantum Electron. 7,143-148 (2001).
[CrossRef]

Tsuchiya, Y.

T. Kawashima, T. Kurita, O. Matsumoto, T. Ikegawa, T. Sekine, M. Miyamoto, K Iyama, H. Kan, and Y. Tsuchiya, "20-J Diode-Pumped Zig-Zag Slab Laser with 2-GW Peak Power and 200-W Average Power," ASSP 2005, TuB44 (2005).

Wagner, G.

Wenzel, H.

G. Erbert, G. Beister, R. Hulsewede, A. Knauer, W. Pittroff, J. Sebastian, H. Wenzel, M. Weyers, and G. Trankle, "High-Power Highly Reliable Al-Free 940-nm Diode Lasers," IEEE J. Sel. Top. Quantum Electron. 7,143-148 (2001).
[CrossRef]

Weyers, M.

G. Erbert, G. Beister, R. Hulsewede, A. Knauer, W. Pittroff, J. Sebastian, H. Wenzel, M. Weyers, and G. Trankle, "High-Power Highly Reliable Al-Free 940-nm Diode Lasers," IEEE J. Sel. Top. Quantum Electron. 7,143-148 (2001).
[CrossRef]

Wulfmeyer, V.

Zhang, G.

C. H¨onninger, R. Paschotta, M. Graf, F. Morier-Genoud, G. Zhang, M. Moser, S. Biswal, J. Nees, A. Braun, G. A. Mourou, I. Johannsen, A. Giessen, W. Seeber, and U. Keller, "Ultrafast ytterbium-doped bulk lasers and laser amplifiers," Appl. Phys. B 69,3-17 (1999).
[CrossRef]

Appl. Opt.

Appl. Phys. B

C. H¨onninger, R. Paschotta, M. Graf, F. Morier-Genoud, G. Zhang, M. Moser, S. Biswal, J. Nees, A. Braun, G. A. Mourou, I. Johannsen, A. Giessen, W. Seeber, and U. Keller, "Ultrafast ytterbium-doped bulk lasers and laser amplifiers," Appl. Phys. B 69,3-17 (1999).
[CrossRef]

V. V. Filippov, N. V. Kuleshov, and I. T. Bodnar, "Negative thermo-optical coefficients and athermal directions in monoclinc KGd(WO4)2 and KY(WO4)2 laser host crystals in teh visible region," Appl. Phys. B 87,611-614 (2007).
[CrossRef]

J. E. Hellstr¨om, S. Bjurshagen, and V. Pasiskevicius "Laser performance and thermal lensing in high-power diode-pumped Yb:KGW with athermal orientation," Appl. Phys. B 83,55-59 (2006).
[CrossRef]

J. E. Hellstrom, S. Bjurshagen, V. Pasiskevicius, J. Liu, V. Petrov, and U. Griebner, "Efficient Yb:KGW lasers end-pumped by high-power diode bars," Appl. Phys. B 83,235-239 (2006).
[CrossRef]

ASSP

T. Kawashima, T. Kurita, O. Matsumoto, T. Ikegawa, T. Sekine, M. Miyamoto, K Iyama, H. Kan, and Y. Tsuchiya, "20-J Diode-Pumped Zig-Zag Slab Laser with 2-GW Peak Power and 200-W Average Power," ASSP 2005, TuB44 (2005).

IEEE J. Quantum Electron.

S. Ch??enais, F. Balembois, F. Druon, G. Lucas-Leclin, and P. Georges, "Thermal Lensing in Diode-Pumped Ytterbium Lasers - Part I: Theoretical Analysis and Wavefront Measurements," IEEE J. Quantum Electron. 40,1217-1234 (2004).
[CrossRef]

IEEE J. Sel. Top. Quantum Electron.

G. Erbert, G. Beister, R. Hulsewede, A. Knauer, W. Pittroff, J. Sebastian, H. Wenzel, M. Weyers, and G. Trankle, "High-Power Highly Reliable Al-Free 940-nm Diode Lasers," IEEE J. Sel. Top. Quantum Electron. 7,143-148 (2001).
[CrossRef]

J. Sebastian, G. Beister, F. Bugge, f. Buhrandt, G. Erbert, G. H¨ansel, R. H¨ulsewede, A. Knauer, W. Pittroff, R. Staske, M. Schroder, H. Wenzel, M. Weyers, and G. Tr¨ankle, "High-Power 810-nm GaAsP-AlGaAs Diode Lasers With Narrow Beam Divergence," IEEE J. Sel. Top. Quantum Electron. 7,334-339 (2001).
[CrossRef]

J. Opt. Soc. Am. B

C. E. Mungan, "Thermodynamics of radiation-balanced lasing," J. Opt. Soc. Am. B 20,1075-1082 (2003).
[CrossRef]

J. Opt. Technol.

I. V. Mochalov, "Nonlinear optics of the potassium gadolinium tungstate laser crystal Nd3+:KGd(WO4)2," J. Opt. Technol. 62,746-756 (1995).

Opt. Express

Opt. Lett.

Topics Appl. Phys.

G. Erbert, A. Barwolff, J. Sebastian, and J. Tomm, "High-Power Broad-Area Diode Lasers and Laser Bars," Topics Appl. Phys. 78,172-223 (2000).

Other

A. E. Siegman, Lasers, (University Science Books, 1986).

EKSPLA, "Yb:KGW and Yb:KYW Crystals," http://www.ekspla.com/en/main/products/1/63?pid=498.

S. Chenais, F. Druon, S. Forget, F. Balembois, and P. Georges, "On thermal effects in solid state lasers: the case of ytterbium-doped materials," http://arxiv.org/ftp/arxiv/papers/0704/0704.0701.pdf.

H. Ibach and H. Luth, Solid-State Physics, (Springer, 2003).

S. Biswal, S. Shawn, P. O??Connor, and S. R. Bowman, "Thermo-optical parameters measured in potassium-adolinium-tungstate," CLEO 2004, CThT62 (2004).

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Figures (7)

Fig. 1.
Fig. 1.

Cross section plots of the normalized intensity of beam profiles of a 12 W single emitter diode operating at various power settings. The beam profiles were taken with a CCD camera at output powers between 9.2 W and 12.0 W as indicated. The red curves (circles) depict the beam profile along the vertical axis and the black curves (squares) along the horizontal axis. The linear plots approximately depict the area taken into account with calculations with the M 2-parameter, whereas the lower right plot shows a saturated image at 12 W to emphasize the overall area covered by the beam profile.

Fig. 2.
Fig. 2.

The focal length of the thermal lens was determined by measuring the divergence angle of the output laser beam of a three-mirror cavity. Here LD denotes the single emitter laser diode, SL and CL are one spherical and two cylindrical lenses, respectively, DM is a dichroic mirror, HR is a curved highly reflective mirror, and OC is a output coupling mirror. The plot gives the wavelength dependence of the pump light absorption in the Yb:KGW crystal for non-lasing conditions and a sample spectrum of a 12 W single emitter diode.

Fig. 3.
Fig. 3.

The focal length of the thermal lens along two axes induced by end pumping the Yb:KGW crystal with a 12 W single emitter diode was determined experimentally by measuring the beam divergence of the output beam of two different three-mirror laser resonators (squares: resonator with a curved mirror with 200 mm radius, circles: resonator with a mirror with a radius of curvature of 300 mm).

Fig. 4.
Fig. 4.

Output power (black curve, squares) and M2-values (circles horizontal and triangles vertical) for resonators pumped with a 12 W diode (a) and with a 18 W diode (b), respectively. The laser wavelength was approximately 1030 nm for all pump powers and the pump wavelength ranged from approximately 976 nm to 981 nm for the highest pump power.

Fig. 5.
Fig. 5.

(a) Measurements of the thermal lens with the same diode. The full symbols depict the focal length for the original collimation and the hollow symbols for a slightly re-aligned collimation lens (squares: horizontal, circles: vertical direction). (b) Thermal lens with 12 W and 18 W diodes. Even if the beam diameters were held the same in both cases, the thermal lens is stronger in the case of less pump power (squares: horizontal, circles: vertical, full symbols: 12 W diode, hollow symbols: 18 W diode).

Fig. 6.
Fig. 6.

The temperature distribution inside the laser crystal and the bulging of the front facet was simulated by finite element analysis. The diagrams depict the results for 12 W pump power with a Gaussian beam profile without mode pattern. The insets show the temperature distribution in two perpendicular planes through the crystal.

Fig. 7.
Fig. 7.

(a) Focal length of the thermal lens when pumping with a 12 W single emitter diode and for pumping with a multi-mode fiber-coupled 6.7 W diode with M 2=24×24 (b), respectively. The black curves (squares) show experimental data points, whereas the red curves (circles) were obtained theoretically with a Gaussian beam profile with the calculated diameter. The blue curves (triangles) show theoretical data obtained for a Gaussian beam profile with twice the calculated beam diameter. Full symbols depict simulations with a fixed fraction of pump light converted to heat, whereas the hollow symbols take the laser efficiency into account. The inset images show the pump beam profiles of each pump diode.

Equations (2)

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[ k ( T ) T ( r ) ] = Q ( r ) ,
f = 1 ( n 1 ) · 2 A

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