Abstract

Enhanced efficiency and stabilized beam-power generation were proved for a high-brightness cw-based 500-W Nd:YAG rod laser by compensation of the thermally induced bifocusing of the Nd:YAG rod. Maximum laser power of 500 W cw was obtained at lamp input power of 18.4 kW, with beam quality M 2 = 19 or ωθ (radius x, the half-angle of divergence) = 6.4 mm mrad and power fluctuation of less than 1%.

© 1996 Optical Society of America

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References

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  1. R. L. Byer, “Diode laser-pumped solid-state lasers,” Science 239, 742 (1988).
    [CrossRef] [PubMed]
  2. W. S. Martin, J. P. Chernoch, “Multi internal reflection face pumped laser,” U.S. patent3,663,126 (4January1972).
  3. T. Kojima, K. Yasui, “High-power green beam generation in continuous-wave mode by use of long KTiOPO4 crystals with a Nd:YAG laser,” Opt. Lett. 19, 713–715 (1994).
    [CrossRef] [PubMed]
  4. K. Yasui, T. Kojima, “Continuous-wave 40-W solid-state green laser,” paper no. TuB2 presented at CLEO/Pacific Rim ‘95, Chiba, Japan, July 1995.
  5. W. C. Scott, M. de Wit, “Birefringence compensation and TEM00 mode enhancement in a Nd:YAG laser,” Appl. Phys. Lett. 18, 3–4 (1971).
    [CrossRef]
  6. S. C. Tidwell, J. F. Seamans, M. S. Bowers, “Highly efficient 60-W TEM00 cw diode-end-pumped Nd:YAG laser,” Opt. Lett. 18, 116–118 (1993).
    [CrossRef] [PubMed]
  7. N. U. Wetter, E. P. Maldonado, N. D. Vieira, “Enhanced efficiency of a continuous-wave mode-locked Nd:YAG laser by compensation of the thermally induced, polarization-dependent bifocal lens,” Appl. Opt. 32, 5280–5284 (1993).
    [CrossRef] [PubMed]
  8. G. Cerullo, S. De Silvestri, V. Magni, O. Svelto, “Output power limitations in CW single transverse mode Nd:YAG lasers with a rod of large cross-section,” Opt. Quantum Electron. 25, 489–500 (1993).
    [CrossRef]
  9. N. Hodgson, H. Weber, “Influence of spherical aberration of the active medium on the performance of Nd:YAG lasers,” IEEE J. Quantum Electron. 29, 2497–2507 (1993).
    [CrossRef]
  10. K. Yasui, J. Nishimae, “Beam-mode calculations of a strongly pumped solid-state rod laser with an unstable resonator,” Opt. Lett. 19, 560–562 (1994).
    [CrossRef] [PubMed]

1994

1993

N. U. Wetter, E. P. Maldonado, N. D. Vieira, “Enhanced efficiency of a continuous-wave mode-locked Nd:YAG laser by compensation of the thermally induced, polarization-dependent bifocal lens,” Appl. Opt. 32, 5280–5284 (1993).
[CrossRef] [PubMed]

G. Cerullo, S. De Silvestri, V. Magni, O. Svelto, “Output power limitations in CW single transverse mode Nd:YAG lasers with a rod of large cross-section,” Opt. Quantum Electron. 25, 489–500 (1993).
[CrossRef]

N. Hodgson, H. Weber, “Influence of spherical aberration of the active medium on the performance of Nd:YAG lasers,” IEEE J. Quantum Electron. 29, 2497–2507 (1993).
[CrossRef]

S. C. Tidwell, J. F. Seamans, M. S. Bowers, “Highly efficient 60-W TEM00 cw diode-end-pumped Nd:YAG laser,” Opt. Lett. 18, 116–118 (1993).
[CrossRef] [PubMed]

1988

R. L. Byer, “Diode laser-pumped solid-state lasers,” Science 239, 742 (1988).
[CrossRef] [PubMed]

1971

W. C. Scott, M. de Wit, “Birefringence compensation and TEM00 mode enhancement in a Nd:YAG laser,” Appl. Phys. Lett. 18, 3–4 (1971).
[CrossRef]

Bowers, M. S.

Byer, R. L.

R. L. Byer, “Diode laser-pumped solid-state lasers,” Science 239, 742 (1988).
[CrossRef] [PubMed]

Cerullo, G.

G. Cerullo, S. De Silvestri, V. Magni, O. Svelto, “Output power limitations in CW single transverse mode Nd:YAG lasers with a rod of large cross-section,” Opt. Quantum Electron. 25, 489–500 (1993).
[CrossRef]

Chernoch, J. P.

W. S. Martin, J. P. Chernoch, “Multi internal reflection face pumped laser,” U.S. patent3,663,126 (4January1972).

De Silvestri, S.

G. Cerullo, S. De Silvestri, V. Magni, O. Svelto, “Output power limitations in CW single transverse mode Nd:YAG lasers with a rod of large cross-section,” Opt. Quantum Electron. 25, 489–500 (1993).
[CrossRef]

de Wit, M.

W. C. Scott, M. de Wit, “Birefringence compensation and TEM00 mode enhancement in a Nd:YAG laser,” Appl. Phys. Lett. 18, 3–4 (1971).
[CrossRef]

Hodgson, N.

N. Hodgson, H. Weber, “Influence of spherical aberration of the active medium on the performance of Nd:YAG lasers,” IEEE J. Quantum Electron. 29, 2497–2507 (1993).
[CrossRef]

Kojima, T.

T. Kojima, K. Yasui, “High-power green beam generation in continuous-wave mode by use of long KTiOPO4 crystals with a Nd:YAG laser,” Opt. Lett. 19, 713–715 (1994).
[CrossRef] [PubMed]

K. Yasui, T. Kojima, “Continuous-wave 40-W solid-state green laser,” paper no. TuB2 presented at CLEO/Pacific Rim ‘95, Chiba, Japan, July 1995.

Magni, V.

G. Cerullo, S. De Silvestri, V. Magni, O. Svelto, “Output power limitations in CW single transverse mode Nd:YAG lasers with a rod of large cross-section,” Opt. Quantum Electron. 25, 489–500 (1993).
[CrossRef]

Maldonado, E. P.

Martin, W. S.

W. S. Martin, J. P. Chernoch, “Multi internal reflection face pumped laser,” U.S. patent3,663,126 (4January1972).

Nishimae, J.

Scott, W. C.

W. C. Scott, M. de Wit, “Birefringence compensation and TEM00 mode enhancement in a Nd:YAG laser,” Appl. Phys. Lett. 18, 3–4 (1971).
[CrossRef]

Seamans, J. F.

Svelto, O.

G. Cerullo, S. De Silvestri, V. Magni, O. Svelto, “Output power limitations in CW single transverse mode Nd:YAG lasers with a rod of large cross-section,” Opt. Quantum Electron. 25, 489–500 (1993).
[CrossRef]

Tidwell, S. C.

Vieira, N. D.

Weber, H.

N. Hodgson, H. Weber, “Influence of spherical aberration of the active medium on the performance of Nd:YAG lasers,” IEEE J. Quantum Electron. 29, 2497–2507 (1993).
[CrossRef]

Wetter, N. U.

Yasui, K.

Appl. Opt.

Appl. Phys. Lett.

W. C. Scott, M. de Wit, “Birefringence compensation and TEM00 mode enhancement in a Nd:YAG laser,” Appl. Phys. Lett. 18, 3–4 (1971).
[CrossRef]

IEEE J. Quantum Electron.

N. Hodgson, H. Weber, “Influence of spherical aberration of the active medium on the performance of Nd:YAG lasers,” IEEE J. Quantum Electron. 29, 2497–2507 (1993).
[CrossRef]

Opt. Lett.

Opt. Quantum Electron.

G. Cerullo, S. De Silvestri, V. Magni, O. Svelto, “Output power limitations in CW single transverse mode Nd:YAG lasers with a rod of large cross-section,” Opt. Quantum Electron. 25, 489–500 (1993).
[CrossRef]

Science

R. L. Byer, “Diode laser-pumped solid-state lasers,” Science 239, 742 (1988).
[CrossRef] [PubMed]

Other

W. S. Martin, J. P. Chernoch, “Multi internal reflection face pumped laser,” U.S. patent3,663,126 (4January1972).

K. Yasui, T. Kojima, “Continuous-wave 40-W solid-state green laser,” paper no. TuB2 presented at CLEO/Pacific Rim ‘95, Chiba, Japan, July 1995.

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Figures (6)

Fig. 1
Fig. 1

Schematic of the experimental setup.

Fig. 2
Fig. 2

Stability-zone calculations for two polarization beams along the radial direction (r polarization) and the tangential direction (ϕ polarization) in the rod. The beam spot size for theoretical Gaussian beams at the end surface of the Nd:YAG rod was calculated as a function of the lamp input power (a) with and (b) without bifocusing compensation.

Fig. 3
Fig. 3

Laser power and beam quality as a function of the total lamp input power to Kr arc lamps.

Fig. 4
Fig. 4

Laser-power comparison against conventional low-brightness operation. The dashed line shows a calculation considering the mode volume ratio.

Fig. 5
Fig. 5

Laser-power and beam-quality comparison between cases with and without bifocusing compensation.

Fig. 6
Fig. 6

Laser-power stability comparison between two cases (a) with and (b) without bifocusing compensation. Laser power was turned off after several minutes’ operation to examine the time constant of the power meter.

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