Abstract

We developed a diode-pumped high-average-power Nd:YAG green laser. By use of a monolithic diffusive reflector having three slits and a rod with low doping concentration, uniform distribution of excited Nd ions could be achieved. Uniform distribution in the rod reduced thermal birefringence. We employed a Z-shaped cavity to have a constant beam size at the frequency-doubling crystal independent of thermal lensing in the rod. The pulse width and green power dependence on the pump power were analyzed. A maximum green power of 101 W was obtained when the total pump power was 398 W. The optical-to-optical conversion efficiency was as high as 25.4%.

© 2004 Optical Society of America

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References

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  1. Y. Jeong, J. K. Sahu, D. N. Payne, J. Nilsson, “Ytterbium-doped large-core fiber laser with 1 kW continuous-wave output power,” in Advanced Solid-State Photonics, Vol. 94 of 2004 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 2004), postdeadline papers, PD1-1-PD1-3.
  2. J. J. Chang, B. E. Warner, E. P. Dragon, M. W. J. Wallace, “Precision micromachining with pulsed green lasers,” J. Laser Appl. 10, 285–291 (1988).
    [CrossRef]
  3. F. J. Duarte, Tunable Lasers Handbook (Academic, San Diego, 1995), Chaps. 5–6.
  4. Y. Akiyama, H. Takada, H. Yuasa, N. Nishida, “10 kW diode-pumped Nd:YAG rod laser,” in 24th Annual Meeting of the Laser Society of Japan Digest of Technical Papers (Laser Society of Japan, Tokyo, 2004), pp. 50–53.
  5. K. Tei, M. Kato, F. Matsuoka, Y. Niwa, Y. Maruyama, T. Matoba, T. Arisawa, “High-repetition rate 1-J green laser system,” Appl. Opt. 38, 4548–4551 (1999).
    [CrossRef]
  6. B. J. Le Garrec, G. J. Raze, P. Y. Thro, M. Gilbert, “High average-power diode-pumped frequency-doubled YAG laser,” Opt. Lett. 21, 1990–1992 (1996).
    [CrossRef]
  7. J. J. Chang, E. P. Dragon, I. L. Bass, “315-W pulsed-green generation with a diode-pumped Nd:YAG laser,” in Conference on Lasers and Electro-Optics, Vol. 6 of 1998 OSA Technical Digests (Optical Society of America, Washington, D.C., 1998), papers CPD2-2-CPD2-3.
  8. S. Konno, T. Kojima, S. Fujikawa, K. Yasui, “High-brightness 138-W green laser based on an intracavity-frequency-doubled diode-side-pumped Q-switched Nd:YAG laser,” Opt. Lett. 25, 105–107 (2000).
    [CrossRef]
  9. S. Konno, Y. Inoue, T. Kojima, S. Fujikawa, K. Yasui, “Efficient high-pulse energy green beam generation by intracavity frequency doubling of a quasi-continuous-wave laser-diode-pumped Nd:YAG laser,” Appl. Opt. 40, 4341–4343 (2001).
    [CrossRef]
  10. J. Lee, H.-J. Moon, J. Yi, B. Cha., C. J. Kim, S. Suk, H. S. Kim, “Efficient CW operation of TEM00 mode from a diffusive reflector type diode side pumped Nd:YAG laser,” Jpn. J. Appl. Phys. 38, L315–L317 (1999).
    [CrossRef]
  11. S. Lee, M. Yun, B. Cha, “Stability analysis of a diode-pumped, thermal birefringence-compensated two-rod Nd:YAG laser with 770-W output power,” Appl. Opt. 41, 5625–5631 (2002).
    [CrossRef] [PubMed]
  12. S. Lee, S. K. Kim, M. Yun, H. S. Kim, B. Cha, H.-J. Moon, “Design and fabrication of a diode-side-pumped Nd:YAG laser with a diffusive optical cavity for 500-W output power,” Appl. Opt. 41, 1089–104 (2002).
    [CrossRef] [PubMed]
  13. S. B. Sutton, G. F. Albrecht, “Simple analytical method to calculate the radial energy distribution profile in an isotropic diode-pumped solid-state laser rod,” Appl. Opt. 35, 5937–5948 (1996).
    [CrossRef] [PubMed]
  14. H.-J. Moon, J. Yi, B. Cha, J. Lee, “Efficient diffusive reflector type diode side pumped Nd:YAG rod laser with the optical slope efficiency of 55%,” Appl. Opt. 38, 1772–1776 (1999).
    [CrossRef]
  15. J. Lee, H.-J. Moon, J. Yi, S. Lee, B. Cha, “Measurement of absorption efficiency by a leakage power analysis method from an efficient Nd:YAG rod laser pumped by diode bars,” Jpn. J. Appl. Phys. 38, 2769–2774 (1999).
    [CrossRef]
  16. D. J. Kuizenga, “Intra-cavity beam relay for optical harmonic generation,” U.S. Patent5,025,446 (18June1991).
  17. W. Xie, S.-C. Tam, Y.-L. Lam, H. Yang, J. Liu, J. Gu, W. Tan, “Thermal and optical properties of diode side pumped solid state laser rod,” Opt. Lasers Technol. 32, 193–198 (2000).
    [CrossRef]
  18. J. Zheng, S. Zhao, Q. Wang, X. Zhang, L. Chen, “Influence of thermal effect on KTP type-II phase-matching second-harmonic generation,” Opt. Commun. 15, 207–214 (2001).
    [CrossRef]
  19. P. E. Perkins, T. S. Fahlen, “20-W average power KTP intracavity-doubled Nd:YAG laser,” J. Opt. Soc. Am. B 4, 1066–1071 (1987).
    [CrossRef]

2002 (2)

2001 (2)

J. Zheng, S. Zhao, Q. Wang, X. Zhang, L. Chen, “Influence of thermal effect on KTP type-II phase-matching second-harmonic generation,” Opt. Commun. 15, 207–214 (2001).
[CrossRef]

S. Konno, Y. Inoue, T. Kojima, S. Fujikawa, K. Yasui, “Efficient high-pulse energy green beam generation by intracavity frequency doubling of a quasi-continuous-wave laser-diode-pumped Nd:YAG laser,” Appl. Opt. 40, 4341–4343 (2001).
[CrossRef]

2000 (2)

S. Konno, T. Kojima, S. Fujikawa, K. Yasui, “High-brightness 138-W green laser based on an intracavity-frequency-doubled diode-side-pumped Q-switched Nd:YAG laser,” Opt. Lett. 25, 105–107 (2000).
[CrossRef]

W. Xie, S.-C. Tam, Y.-L. Lam, H. Yang, J. Liu, J. Gu, W. Tan, “Thermal and optical properties of diode side pumped solid state laser rod,” Opt. Lasers Technol. 32, 193–198 (2000).
[CrossRef]

1999 (4)

J. Lee, H.-J. Moon, J. Yi, B. Cha., C. J. Kim, S. Suk, H. S. Kim, “Efficient CW operation of TEM00 mode from a diffusive reflector type diode side pumped Nd:YAG laser,” Jpn. J. Appl. Phys. 38, L315–L317 (1999).
[CrossRef]

J. Lee, H.-J. Moon, J. Yi, S. Lee, B. Cha, “Measurement of absorption efficiency by a leakage power analysis method from an efficient Nd:YAG rod laser pumped by diode bars,” Jpn. J. Appl. Phys. 38, 2769–2774 (1999).
[CrossRef]

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

K. Tei, M. Kato, F. Matsuoka, Y. Niwa, Y. Maruyama, T. Matoba, T. Arisawa, “High-repetition rate 1-J green laser system,” Appl. Opt. 38, 4548–4551 (1999).
[CrossRef]

1996 (2)

1988 (1)

J. J. Chang, B. E. Warner, E. P. Dragon, M. W. J. Wallace, “Precision micromachining with pulsed green lasers,” J. Laser Appl. 10, 285–291 (1988).
[CrossRef]

1987 (1)

Akiyama, Y.

Y. Akiyama, H. Takada, H. Yuasa, N. Nishida, “10 kW diode-pumped Nd:YAG rod laser,” in 24th Annual Meeting of the Laser Society of Japan Digest of Technical Papers (Laser Society of Japan, Tokyo, 2004), pp. 50–53.

Albrecht, G. F.

Arisawa, T.

Bass, I. L.

J. J. Chang, E. P. Dragon, I. L. Bass, “315-W pulsed-green generation with a diode-pumped Nd:YAG laser,” in Conference on Lasers and Electro-Optics, Vol. 6 of 1998 OSA Technical Digests (Optical Society of America, Washington, D.C., 1998), papers CPD2-2-CPD2-3.

Cha, B.

Cha., B.

J. Lee, H.-J. Moon, J. Yi, B. Cha., C. J. Kim, S. Suk, H. S. Kim, “Efficient CW operation of TEM00 mode from a diffusive reflector type diode side pumped Nd:YAG laser,” Jpn. J. Appl. Phys. 38, L315–L317 (1999).
[CrossRef]

Chang, J. J.

J. J. Chang, B. E. Warner, E. P. Dragon, M. W. J. Wallace, “Precision micromachining with pulsed green lasers,” J. Laser Appl. 10, 285–291 (1988).
[CrossRef]

J. J. Chang, E. P. Dragon, I. L. Bass, “315-W pulsed-green generation with a diode-pumped Nd:YAG laser,” in Conference on Lasers and Electro-Optics, Vol. 6 of 1998 OSA Technical Digests (Optical Society of America, Washington, D.C., 1998), papers CPD2-2-CPD2-3.

Chen, L.

J. Zheng, S. Zhao, Q. Wang, X. Zhang, L. Chen, “Influence of thermal effect on KTP type-II phase-matching second-harmonic generation,” Opt. Commun. 15, 207–214 (2001).
[CrossRef]

Dragon, E. P.

J. J. Chang, B. E. Warner, E. P. Dragon, M. W. J. Wallace, “Precision micromachining with pulsed green lasers,” J. Laser Appl. 10, 285–291 (1988).
[CrossRef]

J. J. Chang, E. P. Dragon, I. L. Bass, “315-W pulsed-green generation with a diode-pumped Nd:YAG laser,” in Conference on Lasers and Electro-Optics, Vol. 6 of 1998 OSA Technical Digests (Optical Society of America, Washington, D.C., 1998), papers CPD2-2-CPD2-3.

Duarte, F. J.

F. J. Duarte, Tunable Lasers Handbook (Academic, San Diego, 1995), Chaps. 5–6.

Fahlen, T. S.

Fujikawa, S.

Gilbert, M.

Gu, J.

W. Xie, S.-C. Tam, Y.-L. Lam, H. Yang, J. Liu, J. Gu, W. Tan, “Thermal and optical properties of diode side pumped solid state laser rod,” Opt. Lasers Technol. 32, 193–198 (2000).
[CrossRef]

Inoue, Y.

Jeong, Y.

Y. Jeong, J. K. Sahu, D. N. Payne, J. Nilsson, “Ytterbium-doped large-core fiber laser with 1 kW continuous-wave output power,” in Advanced Solid-State Photonics, Vol. 94 of 2004 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 2004), postdeadline papers, PD1-1-PD1-3.

Kato, M.

Kim, C. J.

J. Lee, H.-J. Moon, J. Yi, B. Cha., C. J. Kim, S. Suk, H. S. Kim, “Efficient CW operation of TEM00 mode from a diffusive reflector type diode side pumped Nd:YAG laser,” Jpn. J. Appl. Phys. 38, L315–L317 (1999).
[CrossRef]

Kim, H. S.

S. Lee, S. K. Kim, M. Yun, H. S. Kim, B. Cha, H.-J. Moon, “Design and fabrication of a diode-side-pumped Nd:YAG laser with a diffusive optical cavity for 500-W output power,” Appl. Opt. 41, 1089–104 (2002).
[CrossRef] [PubMed]

J. Lee, H.-J. Moon, J. Yi, B. Cha., C. J. Kim, S. Suk, H. S. Kim, “Efficient CW operation of TEM00 mode from a diffusive reflector type diode side pumped Nd:YAG laser,” Jpn. J. Appl. Phys. 38, L315–L317 (1999).
[CrossRef]

Kim, S. K.

Kojima, T.

Konno, S.

Kuizenga, D. J.

D. J. Kuizenga, “Intra-cavity beam relay for optical harmonic generation,” U.S. Patent5,025,446 (18June1991).

Lam, Y.-L.

W. Xie, S.-C. Tam, Y.-L. Lam, H. Yang, J. Liu, J. Gu, W. Tan, “Thermal and optical properties of diode side pumped solid state laser rod,” Opt. Lasers Technol. 32, 193–198 (2000).
[CrossRef]

Le Garrec, B. J.

Lee, J.

J. Lee, H.-J. Moon, J. Yi, B. Cha., C. J. Kim, S. Suk, H. S. Kim, “Efficient CW operation of TEM00 mode from a diffusive reflector type diode side pumped Nd:YAG laser,” Jpn. J. Appl. Phys. 38, L315–L317 (1999).
[CrossRef]

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

J. Lee, H.-J. Moon, J. Yi, S. Lee, B. Cha, “Measurement of absorption efficiency by a leakage power analysis method from an efficient Nd:YAG rod laser pumped by diode bars,” Jpn. J. Appl. Phys. 38, 2769–2774 (1999).
[CrossRef]

Lee, S.

Liu, J.

W. Xie, S.-C. Tam, Y.-L. Lam, H. Yang, J. Liu, J. Gu, W. Tan, “Thermal and optical properties of diode side pumped solid state laser rod,” Opt. Lasers Technol. 32, 193–198 (2000).
[CrossRef]

Maruyama, Y.

Matoba, T.

Matsuoka, F.

Moon, H.-J.

S. Lee, S. K. Kim, M. Yun, H. S. Kim, B. Cha, H.-J. Moon, “Design and fabrication of a diode-side-pumped Nd:YAG laser with a diffusive optical cavity for 500-W output power,” Appl. Opt. 41, 1089–104 (2002).
[CrossRef] [PubMed]

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

J. Lee, H.-J. Moon, J. Yi, B. Cha., C. J. Kim, S. Suk, H. S. Kim, “Efficient CW operation of TEM00 mode from a diffusive reflector type diode side pumped Nd:YAG laser,” Jpn. J. Appl. Phys. 38, L315–L317 (1999).
[CrossRef]

J. Lee, H.-J. Moon, J. Yi, S. Lee, B. Cha, “Measurement of absorption efficiency by a leakage power analysis method from an efficient Nd:YAG rod laser pumped by diode bars,” Jpn. J. Appl. Phys. 38, 2769–2774 (1999).
[CrossRef]

Nilsson, J.

Y. Jeong, J. K. Sahu, D. N. Payne, J. Nilsson, “Ytterbium-doped large-core fiber laser with 1 kW continuous-wave output power,” in Advanced Solid-State Photonics, Vol. 94 of 2004 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 2004), postdeadline papers, PD1-1-PD1-3.

Nishida, N.

Y. Akiyama, H. Takada, H. Yuasa, N. Nishida, “10 kW diode-pumped Nd:YAG rod laser,” in 24th Annual Meeting of the Laser Society of Japan Digest of Technical Papers (Laser Society of Japan, Tokyo, 2004), pp. 50–53.

Niwa, Y.

Payne, D. N.

Y. Jeong, J. K. Sahu, D. N. Payne, J. Nilsson, “Ytterbium-doped large-core fiber laser with 1 kW continuous-wave output power,” in Advanced Solid-State Photonics, Vol. 94 of 2004 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 2004), postdeadline papers, PD1-1-PD1-3.

Perkins, P. E.

Raze, G. J.

Sahu, J. K.

Y. Jeong, J. K. Sahu, D. N. Payne, J. Nilsson, “Ytterbium-doped large-core fiber laser with 1 kW continuous-wave output power,” in Advanced Solid-State Photonics, Vol. 94 of 2004 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 2004), postdeadline papers, PD1-1-PD1-3.

Suk, S.

J. Lee, H.-J. Moon, J. Yi, B. Cha., C. J. Kim, S. Suk, H. S. Kim, “Efficient CW operation of TEM00 mode from a diffusive reflector type diode side pumped Nd:YAG laser,” Jpn. J. Appl. Phys. 38, L315–L317 (1999).
[CrossRef]

Sutton, S. B.

Takada, H.

Y. Akiyama, H. Takada, H. Yuasa, N. Nishida, “10 kW diode-pumped Nd:YAG rod laser,” in 24th Annual Meeting of the Laser Society of Japan Digest of Technical Papers (Laser Society of Japan, Tokyo, 2004), pp. 50–53.

Tam, S.-C.

W. Xie, S.-C. Tam, Y.-L. Lam, H. Yang, J. Liu, J. Gu, W. Tan, “Thermal and optical properties of diode side pumped solid state laser rod,” Opt. Lasers Technol. 32, 193–198 (2000).
[CrossRef]

Tan, W.

W. Xie, S.-C. Tam, Y.-L. Lam, H. Yang, J. Liu, J. Gu, W. Tan, “Thermal and optical properties of diode side pumped solid state laser rod,” Opt. Lasers Technol. 32, 193–198 (2000).
[CrossRef]

Tei, K.

Thro, P. Y.

Wallace, M. W. J.

J. J. Chang, B. E. Warner, E. P. Dragon, M. W. J. Wallace, “Precision micromachining with pulsed green lasers,” J. Laser Appl. 10, 285–291 (1988).
[CrossRef]

Wang, Q.

J. Zheng, S. Zhao, Q. Wang, X. Zhang, L. Chen, “Influence of thermal effect on KTP type-II phase-matching second-harmonic generation,” Opt. Commun. 15, 207–214 (2001).
[CrossRef]

Warner, B. E.

J. J. Chang, B. E. Warner, E. P. Dragon, M. W. J. Wallace, “Precision micromachining with pulsed green lasers,” J. Laser Appl. 10, 285–291 (1988).
[CrossRef]

Xie, W.

W. Xie, S.-C. Tam, Y.-L. Lam, H. Yang, J. Liu, J. Gu, W. Tan, “Thermal and optical properties of diode side pumped solid state laser rod,” Opt. Lasers Technol. 32, 193–198 (2000).
[CrossRef]

Yang, H.

W. Xie, S.-C. Tam, Y.-L. Lam, H. Yang, J. Liu, J. Gu, W. Tan, “Thermal and optical properties of diode side pumped solid state laser rod,” Opt. Lasers Technol. 32, 193–198 (2000).
[CrossRef]

Yasui, K.

Yi, J.

J. Lee, H.-J. Moon, J. Yi, B. Cha., C. J. Kim, S. Suk, H. S. Kim, “Efficient CW operation of TEM00 mode from a diffusive reflector type diode side pumped Nd:YAG laser,” Jpn. J. Appl. Phys. 38, L315–L317 (1999).
[CrossRef]

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

J. Lee, H.-J. Moon, J. Yi, S. Lee, B. Cha, “Measurement of absorption efficiency by a leakage power analysis method from an efficient Nd:YAG rod laser pumped by diode bars,” Jpn. J. Appl. Phys. 38, 2769–2774 (1999).
[CrossRef]

Yuasa, H.

Y. Akiyama, H. Takada, H. Yuasa, N. Nishida, “10 kW diode-pumped Nd:YAG rod laser,” in 24th Annual Meeting of the Laser Society of Japan Digest of Technical Papers (Laser Society of Japan, Tokyo, 2004), pp. 50–53.

Yun, M.

Zhang, X.

J. Zheng, S. Zhao, Q. Wang, X. Zhang, L. Chen, “Influence of thermal effect on KTP type-II phase-matching second-harmonic generation,” Opt. Commun. 15, 207–214 (2001).
[CrossRef]

Zhao, S.

J. Zheng, S. Zhao, Q. Wang, X. Zhang, L. Chen, “Influence of thermal effect on KTP type-II phase-matching second-harmonic generation,” Opt. Commun. 15, 207–214 (2001).
[CrossRef]

Zheng, J.

J. Zheng, S. Zhao, Q. Wang, X. Zhang, L. Chen, “Influence of thermal effect on KTP type-II phase-matching second-harmonic generation,” Opt. Commun. 15, 207–214 (2001).
[CrossRef]

Appl. Opt. (6)

J. Laser Appl. (1)

J. J. Chang, B. E. Warner, E. P. Dragon, M. W. J. Wallace, “Precision micromachining with pulsed green lasers,” J. Laser Appl. 10, 285–291 (1988).
[CrossRef]

J. Opt. Soc. Am. B (1)

Jpn. J. Appl. Phys. (2)

J. Lee, H.-J. Moon, J. Yi, B. Cha., C. J. Kim, S. Suk, H. S. Kim, “Efficient CW operation of TEM00 mode from a diffusive reflector type diode side pumped Nd:YAG laser,” Jpn. J. Appl. Phys. 38, L315–L317 (1999).
[CrossRef]

J. Lee, H.-J. Moon, J. Yi, S. Lee, B. Cha, “Measurement of absorption efficiency by a leakage power analysis method from an efficient Nd:YAG rod laser pumped by diode bars,” Jpn. J. Appl. Phys. 38, 2769–2774 (1999).
[CrossRef]

Opt. Commun. (1)

J. Zheng, S. Zhao, Q. Wang, X. Zhang, L. Chen, “Influence of thermal effect on KTP type-II phase-matching second-harmonic generation,” Opt. Commun. 15, 207–214 (2001).
[CrossRef]

Opt. Lasers Technol. (1)

W. Xie, S.-C. Tam, Y.-L. Lam, H. Yang, J. Liu, J. Gu, W. Tan, “Thermal and optical properties of diode side pumped solid state laser rod,” Opt. Lasers Technol. 32, 193–198 (2000).
[CrossRef]

Opt. Lett. (2)

Other (5)

Y. Jeong, J. K. Sahu, D. N. Payne, J. Nilsson, “Ytterbium-doped large-core fiber laser with 1 kW continuous-wave output power,” in Advanced Solid-State Photonics, Vol. 94 of 2004 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 2004), postdeadline papers, PD1-1-PD1-3.

D. J. Kuizenga, “Intra-cavity beam relay for optical harmonic generation,” U.S. Patent5,025,446 (18June1991).

F. J. Duarte, Tunable Lasers Handbook (Academic, San Diego, 1995), Chaps. 5–6.

Y. Akiyama, H. Takada, H. Yuasa, N. Nishida, “10 kW diode-pumped Nd:YAG rod laser,” in 24th Annual Meeting of the Laser Society of Japan Digest of Technical Papers (Laser Society of Japan, Tokyo, 2004), pp. 50–53.

J. J. Chang, E. P. Dragon, I. L. Bass, “315-W pulsed-green generation with a diode-pumped Nd:YAG laser,” in Conference on Lasers and Electro-Optics, Vol. 6 of 1998 OSA Technical Digests (Optical Society of America, Washington, D.C., 1998), papers CPD2-2-CPD2-3.

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Figures (7)

Fig. 1
Fig. 1

Cross section of the pump head.

Fig. 2
Fig. 2

Schematic layout of the Z-shaped cavity. Overall cavity length is 65 cm. M1, M2, M3, M4, mirrors; P1, P2, powermeters; AO, acousto-optic Q-switch; CCD, charge-coupled device; LD, laser diode; R1, R2, radii of curvature; d 1, distance from mirror M2 to Nd:YAG rod end surface; d 2, distance from mirror M3 to KTP crystal surface.

Fig. 3
Fig. 3

Spatial profile of fluorescence from the Nd:YAG rod measured by a CCD camera. (a) Rod in the diffusive reflector, (b) rod in the gold-coated glass reflector.

Fig. 4
Fig. 4

Calculated cavity stability as functions of thermal focal length and distance from curved mirror to rod end surface (d 1). (a) Tangential plane, (b) sagittal plane.

Fig. 5
Fig. 5

Output power of fundamental laser as a function of pump power for a Z-shaped cavity (cavity length, 65 cm). ■, gold reflector case, cw lasing; ●, gold reflector case, Q-switching frequency of 10 kHz; ▲, diffusive reflector case, cw lasing; ▼, diffusive reflector, Q-switching frequency of 25 kHz.

Fig. 6
Fig. 6

Output power of SHG laser as a function of pump power and Q-switching frequency for a Z-shaped cavity. ■, gold reflector case, Q-switching frequency of 10 kHz; ●, gold reflector case, Q-switching frequency of 15 kHz; ▲, diffusive reflector case, Q-switching frequency of 20 kHz; ▼, diffusive reflector, Q-switching frequency of 30 kHz.

Fig. 7
Fig. 7

Pulse width of SHG laser and fundamental IR laser as a function of pump power for a Z-shaped cavity. ■, frequency doubled laser, gold reflector, Q-switching frequency of 10 kHz; ●, frequency doubled laser, gold reflector, Q-switching frequency of 15 kHz; ▲, frequency-doubled laser, diffusive reflector, Q-switching frequency of 20 kHz; ▼, frequency-doubled laser, diffusive reflector, Q-switching frequency of 30 kHz; ◆, fundamental laser, gold reflector, Q-switching frequency of 10 kHz; ◀, fundamental laser, diffusive reflector, Q-switching frequency of 20 kHz.

Equations (4)

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

Pθ=1σ2πexp-θ2/2σ2,
θ1/2=σ/2 ln2.
md1+d2/m=R1+R2/2.
S=A-D2/4.

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