Abstract

We report on the performance of highly efficient, high-power continuous-wave (CW) Nd:YAG lasers that are side pumped by p-polarized diode laser beams. In this configuration pump light is directly coupled into the Nd:YAG rod through a threefold symmetric gold-coated flow tube. The polarization direction of our pump diode bars is perpendicular to the rod’s axis (p-polarized). In a closed coupled resonator, a maximum output power of 195 W in multimode operation is obtained for a pump power of 423 W, which corresponds to an optical-to-optical efficiency of 46% and an electrical-to-optical efficiency of 23%. This is, to the best of our knowledge, the highest electrical-to-optical efficiency reported for a CW diode side-pumped Nd:YAG laser. By the pump-power leakage analysis method, we measured the pumping efficiency to be approximately 94%. The high efficiency of the system can be attributed to wing pumping, which results in uniform pump-light distribution and better pumping efficiency because of the use of p-polarized pump beams.

© 2004 Optical Society of America

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References

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2004 (1)

H. Wang, W. Huang, Z. Zhou, H. Cao, “Experimental study of high power and high efficiency cw diode-side-pumped Nd:YAG laser,” Opt. Laser Technol. 36, 69–73 (2004).
[Crossref]

2002 (1)

2001 (2)

2000 (2)

1999 (2)

H.-J. Moon, J. Yi, J. Han, B. Cha, J. Lee, “Efficient diffusive reflector-type diode side-pumped Nd:YAG rod laser with an optical-slope efficiency of 55%,” Appl. Opt. 38, 1772–1776. (1999).
[Crossref]

Y. F. Chen, “Design criteria for concentration optimization in scaling diode end-pumped lasers to high powers: influence of thermal fracture,” IEEE J. Quantum Electron. 35, 234–239 (1999)
[Crossref]

1997 (1)

1996 (2)

1993 (1)

Akiyama, Y.

A. Takada, Y. Akiyama, T. Takase, S. Yoshida, H. Yuasa, A. Ono, “Highly efficient operation of diode laser transversely pumped high power Nd:YAG rod laser,” in Advanced High-Power Lasers, M. Osinski, H. T. Powell, K. Tyoda, eds., Proc SPIE3889, 216–223 (2000).
[Crossref]

Bode, M.

D. Golla, M. Bode, S. Konke, W. Schone, F. Von Alvensleben, A. Tunnermann, “High power operation of Nd:YAG rod lasers pumped by fiber-coupled diode lasers,” in Advanced Solid-State Lasers, S. A. Payne, C. R. Pollock, eds., Vol. 1 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D. C., 1996), 198–201.

Bowers, M. S.

Cao, H.

H. Wang, W. Huang, Z. Zhou, H. Cao, “Experimental study of high power and high efficiency cw diode-side-pumped Nd:YAG laser,” Opt. Laser Technol. 36, 69–73 (2004).
[Crossref]

Cha, B.

Cha, B. H.

Chen, Y. F.

Y. F. Chen, “Design criteria for concentration optimization in scaling diode end-pumped lasers to high powers: influence of thermal fracture,” IEEE J. Quantum Electron. 35, 234–239 (1999)
[Crossref]

Chen, Y. -F.

Chng, A.

Clarkson, W. A.

Fujikawa, S.

Furuta, K.

Gilbert, M.

Golla, D.

D. Golla, M. Bode, S. Konke, W. Schone, F. Von Alvensleben, A. Tunnermann, “High power operation of Nd:YAG rod lasers pumped by fiber-coupled diode lasers,” in Advanced Solid-State Lasers, S. A. Payne, C. R. Pollock, eds., Vol. 1 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D. C., 1996), 198–201.

Han, J.

Hanna, D. C.

Huang, W.

H. Wang, W. Huang, Z. Zhou, H. Cao, “Experimental study of high power and high efficiency cw diode-side-pumped Nd:YAG laser,” Opt. Laser Technol. 36, 69–73 (2004).
[Crossref]

Kim, H. S.

Kim, S. K.

Kojima, T.

Konke, S.

D. Golla, M. Bode, S. Konke, W. Schone, F. Von Alvensleben, A. Tunnermann, “High power operation of Nd:YAG rod lasers pumped by fiber-coupled diode lasers,” in Advanced Solid-State Lasers, S. A. Payne, C. R. Pollock, eds., Vol. 1 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D. C., 1996), 198–201.

Krupke, W. F.

W. F. Krupke, “Advanced diode-pumped solid-state laser (DPSSLs): near term trends and future prospects,” in Advanced High-Power Lasers, M. Osinski, H. T. Powell, K. Tyoda, eds., Proc SPIE3889, 21–32 (2000).
[Crossref]

Lai, K. S.

Lan, Y. P.

Lau, E.

Le Garrec, B. J.

Lee, J.

Lee, S.

Lim, Y. L.

Moon, H.-J.

Ono, A.

A. Takada, Y. Akiyama, T. Takase, S. Yoshida, H. Yuasa, A. Ono, “Highly efficient operation of diode laser transversely pumped high power Nd:YAG rod laser,” in Advanced High-Power Lasers, M. Osinski, H. T. Powell, K. Tyoda, eds., Proc SPIE3889, 216–223 (2000).
[Crossref]

Puha, P. B.

Raze, G. J.

Sato, M.

M. Sato, “Thermally uniform slab yields high,” Laser Focus World 37, 29–31 (2001).

Schone, W.

D. Golla, M. Bode, S. Konke, W. Schone, F. Von Alvensleben, A. Tunnermann, “High power operation of Nd:YAG rod lasers pumped by fiber-coupled diode lasers,” in Advanced Solid-State Lasers, S. A. Payne, C. R. Pollock, eds., Vol. 1 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D. C., 1996), 198–201.

Seamans, J. F.

Takada, A.

A. Takada, Y. Akiyama, T. Takase, S. Yoshida, H. Yuasa, A. Ono, “Highly efficient operation of diode laser transversely pumped high power Nd:YAG rod laser,” in Advanced High-Power Lasers, M. Osinski, H. T. Powell, K. Tyoda, eds., Proc SPIE3889, 216–223 (2000).
[Crossref]

Takase, T.

A. Takada, Y. Akiyama, T. Takase, S. Yoshida, H. Yuasa, A. Ono, “Highly efficient operation of diode laser transversely pumped high power Nd:YAG rod laser,” in Advanced High-Power Lasers, M. Osinski, H. T. Powell, K. Tyoda, eds., Proc SPIE3889, 216–223 (2000).
[Crossref]

Thro, P. Y.

Tidwell, S. C.

Toh, B. T.

Toh, S. W.

Tunnermann, A.

D. Golla, M. Bode, S. Konke, W. Schone, F. Von Alvensleben, A. Tunnermann, “High power operation of Nd:YAG rod lasers pumped by fiber-coupled diode lasers,” in Advanced Solid-State Lasers, S. A. Payne, C. R. Pollock, eds., Vol. 1 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D. C., 1996), 198–201.

Von Alvensleben, F.

D. Golla, M. Bode, S. Konke, W. Schone, F. Von Alvensleben, A. Tunnermann, “High power operation of Nd:YAG rod lasers pumped by fiber-coupled diode lasers,” in Advanced Solid-State Lasers, S. A. Payne, C. R. Pollock, eds., Vol. 1 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D. C., 1996), 198–201.

Wang, H.

H. Wang, W. Huang, Z. Zhou, H. Cao, “Experimental study of high power and high efficiency cw diode-side-pumped Nd:YAG laser,” Opt. Laser Technol. 36, 69–73 (2004).
[Crossref]

Wang, S. C.

Wu, R. F.

Yasui, K.

Yi, J.

Yoshida, S.

A. Takada, Y. Akiyama, T. Takase, S. Yoshida, H. Yuasa, A. Ono, “Highly efficient operation of diode laser transversely pumped high power Nd:YAG rod laser,” in Advanced High-Power Lasers, M. Osinski, H. T. Powell, K. Tyoda, eds., Proc SPIE3889, 216–223 (2000).
[Crossref]

Yuasa, H.

A. Takada, Y. Akiyama, T. Takase, S. Yoshida, H. Yuasa, A. Ono, “Highly efficient operation of diode laser transversely pumped high power Nd:YAG rod laser,” in Advanced High-Power Lasers, M. Osinski, H. T. Powell, K. Tyoda, eds., Proc SPIE3889, 216–223 (2000).
[Crossref]

Yun, M.

Zhou, Z.

H. Wang, W. Huang, Z. Zhou, H. Cao, “Experimental study of high power and high efficiency cw diode-side-pumped Nd:YAG laser,” Opt. Laser Technol. 36, 69–73 (2004).
[Crossref]

Appl. Opt. (3)

IEEE J. Quantum Electron. (1)

Y. F. Chen, “Design criteria for concentration optimization in scaling diode end-pumped lasers to high powers: influence of thermal fracture,” IEEE J. Quantum Electron. 35, 234–239 (1999)
[Crossref]

Laser Focus World (1)

M. Sato, “Thermally uniform slab yields high,” Laser Focus World 37, 29–31 (2001).

Opt. Laser Technol. (1)

H. Wang, W. Huang, Z. Zhou, H. Cao, “Experimental study of high power and high efficiency cw diode-side-pumped Nd:YAG laser,” Opt. Laser Technol. 36, 69–73 (2004).
[Crossref]

Opt. Lett. (6)

Other (3)

D. Golla, M. Bode, S. Konke, W. Schone, F. Von Alvensleben, A. Tunnermann, “High power operation of Nd:YAG rod lasers pumped by fiber-coupled diode lasers,” in Advanced Solid-State Lasers, S. A. Payne, C. R. Pollock, eds., Vol. 1 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D. C., 1996), 198–201.

A. Takada, Y. Akiyama, T. Takase, S. Yoshida, H. Yuasa, A. Ono, “Highly efficient operation of diode laser transversely pumped high power Nd:YAG rod laser,” in Advanced High-Power Lasers, M. Osinski, H. T. Powell, K. Tyoda, eds., Proc SPIE3889, 216–223 (2000).
[Crossref]

W. F. Krupke, “Advanced diode-pumped solid-state laser (DPSSLs): near term trends and future prospects,” in Advanced High-Power Lasers, M. Osinski, H. T. Powell, K. Tyoda, eds., Proc SPIE3889, 21–32 (2000).
[Crossref]

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Figures (7)

Fig. 1
Fig. 1

Schematics of a threefold symmetric diode-pumping configuration: (a) cross-sectional view and (b) side view of a plano–concave resonator for multimode operation. A fiber located on the window detects pump-power leakage through the space between laser diode bars. M1, M2, mirrors.

Fig. 2
Fig. 2

Fluorescence intensity profile of the pumped Nd:YAG rod recorded with a pyroelectric camera. It shows a nearly uniform intensity distribution over the rod’s cross section.

Fig. 3
Fig. 3

Laser output, optical-to-optical efficiency, and electrical-to-optical efficiency as a function of electrical diode input power.

Fig. 4
Fig. 4

Spatial profile of a multimode output beam detected with a pyroelectric beam profiler measured at a distance of 25 cm from the output coupler.

Fig. 5
Fig. 5

Pumping efficiency calculated from experimental results. The pumping efficiency is defined as the ratio of the power absorbed by the rod to the total diode pump power.

Fig. 6
Fig. 6

Diode output power versus shift in diode emission wavelength for a constant diode coolant temperature.

Fig. 7
Fig. 7

Laser output power as a function of diode coolant temperature.

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