Abstract

Large symmetrical near-diffraction-limited beams 6 mm in diameter with a divergence angle of 1.2 mrad have been extracted from a 0.6% doped Nd:YAG rod pumped by a Kr-arc lamp using a negative-branch unstable resonator with a phase-unifying output coupler. The slope efficiency was 2.6%, the maximum peak laser power was 300 W and the maximum average laser power was 23 W. The misalignment angle of the output coupler to decrease the laser powers by 20% was 2.75 mrad.

© 1990 Optical Society of America

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References

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  1. Lewis M. Holmes, “Commercial Lasers 1988–1989,” Laser Focus World, 25, 67–93 (1989).
  2. K. D. Hachfeld, J. Kantorski, G. White, “Industrial High Brightness Lasers,” in Technical Digest, Conference on Lasers and Electro-Optics (Optical Society of America, Washington, DC, 1988), paper WL3.
  3. C. L. M. Ireland, “Kilowatt Power Levels Excited Industrial-YAG Processing Capabilities,” Laser Focus, 49–64 (Nov., 1988).
  4. T. Yamada, S. Nishimura, S. Yoshida, Y. Fujimori, Ken Ishikawa, “Multikillowatt Continuously Pumped Nd:YAG Laser,” in Technical Digest, Conference on Lasers and Electro-Optics (Optical Society of America, Washington, DC, 1988) paper WL4.
  5. N. McCarthy, P. Lavigne, “Large-Size Gaussian Mode in Unstable Resonators using Gaussian Mirrors,” Opt. Lett. 10, 553–555 (1985).
    [CrossRef] [PubMed]
  6. A. Parent, N. McCarthy, P. Lavigne, “Effects of Hard Apertures on Mode Properties of Resonators with Gaussian Reflectivity Mirrors,” IEEE J. Quantum Electron. 23, 222–228 (1987).
    [CrossRef]
  7. S. De Silvestri, P. Laporta, V. Magni, O. Svelto, “Radially Variable Reflectivity Output Coupler of Novel Design for Unstable Resonators,” Opt. Lett. 12, 84–86 (1987).
    [CrossRef] [PubMed]
  8. S. De Silvestri, P. Laporta, V. Magni, O. Svelto, B. Majocchi, “Unstable Laser Resonators with Super-Gaussian Mirrors,” Opt. Lett. 13, 201–203 (1988).
    [CrossRef] [PubMed]
  9. K. Yasui, M. Tanaka, S. Yagi, “Unstable Resonator with Phase-Unifying Coupler for High-Power Lasers,” Appl. Phys. Lett. 52, 530–531 (1988).
    [CrossRef]
  10. K. Yasui, M. Tanaka, S. Yagi, “An Unstable Resonator with a Phase-Unifying Output Coupler to Extract a Large Uniphase Beam of a Filled-In Circular Pattern,” J. Appl. Phys. 65, 17–21 (1989).
    [CrossRef]
  11. L. M. Osterink, J. D. Foster, “Thermal Effects and Transverse Mode Control in a Nd:YAG Laser,” Appl. Phys. Lett. 12, 128–131 (1968).
    [CrossRef]
  12. W. Koechner, “Thermal Lensing in a Nd:YAG Laser Rod,” Appl. Opt. 9, 2548–2553 (1970).
    [CrossRef] [PubMed]

1989 (2)

Lewis M. Holmes, “Commercial Lasers 1988–1989,” Laser Focus World, 25, 67–93 (1989).

K. Yasui, M. Tanaka, S. Yagi, “An Unstable Resonator with a Phase-Unifying Output Coupler to Extract a Large Uniphase Beam of a Filled-In Circular Pattern,” J. Appl. Phys. 65, 17–21 (1989).
[CrossRef]

1988 (3)

C. L. M. Ireland, “Kilowatt Power Levels Excited Industrial-YAG Processing Capabilities,” Laser Focus, 49–64 (Nov., 1988).

K. Yasui, M. Tanaka, S. Yagi, “Unstable Resonator with Phase-Unifying Coupler for High-Power Lasers,” Appl. Phys. Lett. 52, 530–531 (1988).
[CrossRef]

S. De Silvestri, P. Laporta, V. Magni, O. Svelto, B. Majocchi, “Unstable Laser Resonators with Super-Gaussian Mirrors,” Opt. Lett. 13, 201–203 (1988).
[CrossRef] [PubMed]

1987 (2)

A. Parent, N. McCarthy, P. Lavigne, “Effects of Hard Apertures on Mode Properties of Resonators with Gaussian Reflectivity Mirrors,” IEEE J. Quantum Electron. 23, 222–228 (1987).
[CrossRef]

S. De Silvestri, P. Laporta, V. Magni, O. Svelto, “Radially Variable Reflectivity Output Coupler of Novel Design for Unstable Resonators,” Opt. Lett. 12, 84–86 (1987).
[CrossRef] [PubMed]

1985 (1)

1970 (1)

1968 (1)

L. M. Osterink, J. D. Foster, “Thermal Effects and Transverse Mode Control in a Nd:YAG Laser,” Appl. Phys. Lett. 12, 128–131 (1968).
[CrossRef]

De Silvestri, S.

Foster, J. D.

L. M. Osterink, J. D. Foster, “Thermal Effects and Transverse Mode Control in a Nd:YAG Laser,” Appl. Phys. Lett. 12, 128–131 (1968).
[CrossRef]

Fujimori, Y.

T. Yamada, S. Nishimura, S. Yoshida, Y. Fujimori, Ken Ishikawa, “Multikillowatt Continuously Pumped Nd:YAG Laser,” in Technical Digest, Conference on Lasers and Electro-Optics (Optical Society of America, Washington, DC, 1988) paper WL4.

Hachfeld, K. D.

K. D. Hachfeld, J. Kantorski, G. White, “Industrial High Brightness Lasers,” in Technical Digest, Conference on Lasers and Electro-Optics (Optical Society of America, Washington, DC, 1988), paper WL3.

Holmes, Lewis M.

Lewis M. Holmes, “Commercial Lasers 1988–1989,” Laser Focus World, 25, 67–93 (1989).

Ireland, C. L. M.

C. L. M. Ireland, “Kilowatt Power Levels Excited Industrial-YAG Processing Capabilities,” Laser Focus, 49–64 (Nov., 1988).

Ishikawa, Ken

T. Yamada, S. Nishimura, S. Yoshida, Y. Fujimori, Ken Ishikawa, “Multikillowatt Continuously Pumped Nd:YAG Laser,” in Technical Digest, Conference on Lasers and Electro-Optics (Optical Society of America, Washington, DC, 1988) paper WL4.

Kantorski, J.

K. D. Hachfeld, J. Kantorski, G. White, “Industrial High Brightness Lasers,” in Technical Digest, Conference on Lasers and Electro-Optics (Optical Society of America, Washington, DC, 1988), paper WL3.

Koechner, W.

Laporta, P.

Lavigne, P.

A. Parent, N. McCarthy, P. Lavigne, “Effects of Hard Apertures on Mode Properties of Resonators with Gaussian Reflectivity Mirrors,” IEEE J. Quantum Electron. 23, 222–228 (1987).
[CrossRef]

N. McCarthy, P. Lavigne, “Large-Size Gaussian Mode in Unstable Resonators using Gaussian Mirrors,” Opt. Lett. 10, 553–555 (1985).
[CrossRef] [PubMed]

Magni, V.

Majocchi, B.

McCarthy, N.

A. Parent, N. McCarthy, P. Lavigne, “Effects of Hard Apertures on Mode Properties of Resonators with Gaussian Reflectivity Mirrors,” IEEE J. Quantum Electron. 23, 222–228 (1987).
[CrossRef]

N. McCarthy, P. Lavigne, “Large-Size Gaussian Mode in Unstable Resonators using Gaussian Mirrors,” Opt. Lett. 10, 553–555 (1985).
[CrossRef] [PubMed]

Nishimura, S.

T. Yamada, S. Nishimura, S. Yoshida, Y. Fujimori, Ken Ishikawa, “Multikillowatt Continuously Pumped Nd:YAG Laser,” in Technical Digest, Conference on Lasers and Electro-Optics (Optical Society of America, Washington, DC, 1988) paper WL4.

Osterink, L. M.

L. M. Osterink, J. D. Foster, “Thermal Effects and Transverse Mode Control in a Nd:YAG Laser,” Appl. Phys. Lett. 12, 128–131 (1968).
[CrossRef]

Parent, A.

A. Parent, N. McCarthy, P. Lavigne, “Effects of Hard Apertures on Mode Properties of Resonators with Gaussian Reflectivity Mirrors,” IEEE J. Quantum Electron. 23, 222–228 (1987).
[CrossRef]

Svelto, O.

Tanaka, M.

K. Yasui, M. Tanaka, S. Yagi, “An Unstable Resonator with a Phase-Unifying Output Coupler to Extract a Large Uniphase Beam of a Filled-In Circular Pattern,” J. Appl. Phys. 65, 17–21 (1989).
[CrossRef]

K. Yasui, M. Tanaka, S. Yagi, “Unstable Resonator with Phase-Unifying Coupler for High-Power Lasers,” Appl. Phys. Lett. 52, 530–531 (1988).
[CrossRef]

White, G.

K. D. Hachfeld, J. Kantorski, G. White, “Industrial High Brightness Lasers,” in Technical Digest, Conference on Lasers and Electro-Optics (Optical Society of America, Washington, DC, 1988), paper WL3.

Yagi, S.

K. Yasui, M. Tanaka, S. Yagi, “An Unstable Resonator with a Phase-Unifying Output Coupler to Extract a Large Uniphase Beam of a Filled-In Circular Pattern,” J. Appl. Phys. 65, 17–21 (1989).
[CrossRef]

K. Yasui, M. Tanaka, S. Yagi, “Unstable Resonator with Phase-Unifying Coupler for High-Power Lasers,” Appl. Phys. Lett. 52, 530–531 (1988).
[CrossRef]

Yamada, T.

T. Yamada, S. Nishimura, S. Yoshida, Y. Fujimori, Ken Ishikawa, “Multikillowatt Continuously Pumped Nd:YAG Laser,” in Technical Digest, Conference on Lasers and Electro-Optics (Optical Society of America, Washington, DC, 1988) paper WL4.

Yasui, K.

K. Yasui, M. Tanaka, S. Yagi, “An Unstable Resonator with a Phase-Unifying Output Coupler to Extract a Large Uniphase Beam of a Filled-In Circular Pattern,” J. Appl. Phys. 65, 17–21 (1989).
[CrossRef]

K. Yasui, M. Tanaka, S. Yagi, “Unstable Resonator with Phase-Unifying Coupler for High-Power Lasers,” Appl. Phys. Lett. 52, 530–531 (1988).
[CrossRef]

Yoshida, S.

T. Yamada, S. Nishimura, S. Yoshida, Y. Fujimori, Ken Ishikawa, “Multikillowatt Continuously Pumped Nd:YAG Laser,” in Technical Digest, Conference on Lasers and Electro-Optics (Optical Society of America, Washington, DC, 1988) paper WL4.

Appl. Opt. (1)

Appl. Phys. Lett. (2)

L. M. Osterink, J. D. Foster, “Thermal Effects and Transverse Mode Control in a Nd:YAG Laser,” Appl. Phys. Lett. 12, 128–131 (1968).
[CrossRef]

K. Yasui, M. Tanaka, S. Yagi, “Unstable Resonator with Phase-Unifying Coupler for High-Power Lasers,” Appl. Phys. Lett. 52, 530–531 (1988).
[CrossRef]

IEEE J. Quantum Electron. (1)

A. Parent, N. McCarthy, P. Lavigne, “Effects of Hard Apertures on Mode Properties of Resonators with Gaussian Reflectivity Mirrors,” IEEE J. Quantum Electron. 23, 222–228 (1987).
[CrossRef]

J. Appl. Phys. (1)

K. Yasui, M. Tanaka, S. Yagi, “An Unstable Resonator with a Phase-Unifying Output Coupler to Extract a Large Uniphase Beam of a Filled-In Circular Pattern,” J. Appl. Phys. 65, 17–21 (1989).
[CrossRef]

Laser Focus (1)

C. L. M. Ireland, “Kilowatt Power Levels Excited Industrial-YAG Processing Capabilities,” Laser Focus, 49–64 (Nov., 1988).

Laser Focus World (1)

Lewis M. Holmes, “Commercial Lasers 1988–1989,” Laser Focus World, 25, 67–93 (1989).

Opt. Lett. (3)

Other (2)

K. D. Hachfeld, J. Kantorski, G. White, “Industrial High Brightness Lasers,” in Technical Digest, Conference on Lasers and Electro-Optics (Optical Society of America, Washington, DC, 1988), paper WL3.

T. Yamada, S. Nishimura, S. Yoshida, Y. Fujimori, Ken Ishikawa, “Multikillowatt Continuously Pumped Nd:YAG Laser,” in Technical Digest, Conference on Lasers and Electro-Optics (Optical Society of America, Washington, DC, 1988) paper WL4.

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Figures (9)

Fig. 1
Fig. 1

Resonator configuration.

Fig. 2
Fig. 2

Pulse shapes of the electrical current to the lamp and the output laser power at the repetition rate of 20 Hz.

Fig. 3
Fig. 3

Peak laser power and average laser power as a function of peak electrical input power to the lamp.

Fig. 4
Fig. 4

Peak laser power replotted from the Fig. 3 together with results obtained by replacing the output coupler with usual partial reflectors (R = 2 m) of T = 40% and 60%.

Fig. 5
Fig. 5

Burn patterns on a black acrylic board at 50 mm from the output coupler (left) and at the focus of a lens of f = 1 m (right) at an average laser power of 23 W.

Fig. 6
Fig. 6

Encircled laser power as a function of the divergence full-angle at the far field for a 23 W average laser power. The dotted line represents the calculation for a plane wave of 6 mm in diameter and the dash-dotted vertical line represents an angle defined by the first Airy disk assuming a plane wave 6 mm in diameter.

Fig. 7
Fig. 7

Divergence full-angle defined at 84% of the total power as a function of the average laser power.

Fig. 8
Fig. 8

Laser power versus tilting angle of the output coupler at an average laser power of 23 W.

Fig. 9
Fig. 9

Focal length of a pumped Nd:YAG rod as a function of the average electrical input power to the lamp.

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