Abstract

An efficient high-power cw Nd:YAG slab laser, partially end pumped by diode-laser stacks, and a novel beam-shaping technique are reported. The optical efficiency amounted to 44%, and the slope efficiency amounted to 55%. Introducing an intracavity Brewster plate to polarize the laser beam, we obtained an optical efficiency of 35% and a slope efficiency of 41%. The output beam was rectangular and the beam quality asymmetric in two orthogonal directions. To equalize the beam quality, we introduced a step-mirror beam-shaping technique. The beam-shaping technique and the results obtained are discussed.

© 1997 Optical Society of America

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References

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  1. C. Bibeau, R. Beach, “cw and Q-switched performance of a diode end-pumped Yb:YAG laser,” in Conference on Lasers and Electro-Optics, Vol. 9 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), Postdeadline paper PD23.
  2. R. Weber, B. Neuenschwander, H. P. Weber, “High-power end-pumped composite Nd:YAG rod,” in Technical Digest, Conference on Lasers and Electro-Optics/Europe (IEEE, New York, 1996), p. 5.
  3. W. A. Clarkson, C. Bollig, P. J. Hardman, D. C. Hanna, “High-power diode-bar-pumped Nd:YLF laser at 1.053 µ,” in Conference on Lasers and Electro-Optics, Vol. 9 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), p. 323.
  4. W. L. Nighan, D. Dudley, M. S. Keirsted, “Diode-bar-pumped Nd:YVO4 lasers with >13-W TEM00 output at >50% efficiency,” in Conference on Lasers and Electro-Optics, Vol. 9 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), pp. 17–18.
  5. W. Koechner, Solid-State Laser Engineering, 4th ed. (Springer–Verlag, Berlin, Germany, 1996, pp. 407–408.
  6. J. Zhang, M. Quade, Y. Liao, S. Falter, K. M. Du, P. Loosen, “Polarization characteristics of Nd:YAG laser side-pumped by diode-laser bars,” Appl. Opt. 36, (1997).
  7. J. M. Eggleston, T. J. Kane, K. Kuhn, J. Unternahrer, R. L. Byer, “The slab geometry laser—Part I: theory,” IEEE J. Quantum Electron. QE-20, 289–300 (1984).
    [CrossRef]
  8. J. R. Leger, W. C. Goltsos, “Geometric transformation of linear diode-laser arrays for longitudinal pumping of solid-state lasers,” IEEE J. Quantum Electron. 28, 1088–1100 (1992).
    [CrossRef]
  9. W. A. Clarkson, D. C. Hanna, “Two-mirror beam-shaping technique for high-power diode bars,” Opt. Lett. 21, 375–377 (1996).
    [CrossRef] [PubMed]
  10. G. Feugnet, C. Bussac, C. Larat, M. Schwarz, J. P. Pocholle, “High-efficiency TEM00Nd:YVO4 laser longitudinally pumped by a high-power array,” Opt. Lett. 20, 157–159 (1995).
    [CrossRef] [PubMed]
  11. S. Yamaguchi, T. Kobayashi, Y. Saito, K. Chiba, “Collimation of emission from a high-power multistripe laser-diode bar with multiprism array coupling and focusing to a small spot,” Opt. Lett. 20, 898–900 (1995).
    [CrossRef] [PubMed]
  12. B. Neuenschwander, R. Weber, H. P. Weber, “Determination of the thermal lens in solid-state lasers with stable cavities,” IEEE J. Quantum Electron. 31, 1082–1087 (1995).
    [CrossRef]

1997 (1)

J. Zhang, M. Quade, Y. Liao, S. Falter, K. M. Du, P. Loosen, “Polarization characteristics of Nd:YAG laser side-pumped by diode-laser bars,” Appl. Opt. 36, (1997).

1996 (1)

1995 (3)

1992 (1)

J. R. Leger, W. C. Goltsos, “Geometric transformation of linear diode-laser arrays for longitudinal pumping of solid-state lasers,” IEEE J. Quantum Electron. 28, 1088–1100 (1992).
[CrossRef]

1984 (1)

J. M. Eggleston, T. J. Kane, K. Kuhn, J. Unternahrer, R. L. Byer, “The slab geometry laser—Part I: theory,” IEEE J. Quantum Electron. QE-20, 289–300 (1984).
[CrossRef]

Beach, R.

C. Bibeau, R. Beach, “cw and Q-switched performance of a diode end-pumped Yb:YAG laser,” in Conference on Lasers and Electro-Optics, Vol. 9 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), Postdeadline paper PD23.

Bibeau, C.

C. Bibeau, R. Beach, “cw and Q-switched performance of a diode end-pumped Yb:YAG laser,” in Conference on Lasers and Electro-Optics, Vol. 9 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), Postdeadline paper PD23.

Bollig, C.

W. A. Clarkson, C. Bollig, P. J. Hardman, D. C. Hanna, “High-power diode-bar-pumped Nd:YLF laser at 1.053 µ,” in Conference on Lasers and Electro-Optics, Vol. 9 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), p. 323.

Bussac, C.

Byer, R. L.

J. M. Eggleston, T. J. Kane, K. Kuhn, J. Unternahrer, R. L. Byer, “The slab geometry laser—Part I: theory,” IEEE J. Quantum Electron. QE-20, 289–300 (1984).
[CrossRef]

Chiba, K.

Clarkson, W. A.

W. A. Clarkson, D. C. Hanna, “Two-mirror beam-shaping technique for high-power diode bars,” Opt. Lett. 21, 375–377 (1996).
[CrossRef] [PubMed]

W. A. Clarkson, C. Bollig, P. J. Hardman, D. C. Hanna, “High-power diode-bar-pumped Nd:YLF laser at 1.053 µ,” in Conference on Lasers and Electro-Optics, Vol. 9 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), p. 323.

Du, K. M.

J. Zhang, M. Quade, Y. Liao, S. Falter, K. M. Du, P. Loosen, “Polarization characteristics of Nd:YAG laser side-pumped by diode-laser bars,” Appl. Opt. 36, (1997).

Dudley, D.

W. L. Nighan, D. Dudley, M. S. Keirsted, “Diode-bar-pumped Nd:YVO4 lasers with >13-W TEM00 output at >50% efficiency,” in Conference on Lasers and Electro-Optics, Vol. 9 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), pp. 17–18.

Eggleston, J. M.

J. M. Eggleston, T. J. Kane, K. Kuhn, J. Unternahrer, R. L. Byer, “The slab geometry laser—Part I: theory,” IEEE J. Quantum Electron. QE-20, 289–300 (1984).
[CrossRef]

Falter, S.

J. Zhang, M. Quade, Y. Liao, S. Falter, K. M. Du, P. Loosen, “Polarization characteristics of Nd:YAG laser side-pumped by diode-laser bars,” Appl. Opt. 36, (1997).

Feugnet, G.

Goltsos, W. C.

J. R. Leger, W. C. Goltsos, “Geometric transformation of linear diode-laser arrays for longitudinal pumping of solid-state lasers,” IEEE J. Quantum Electron. 28, 1088–1100 (1992).
[CrossRef]

Hanna, D. C.

W. A. Clarkson, D. C. Hanna, “Two-mirror beam-shaping technique for high-power diode bars,” Opt. Lett. 21, 375–377 (1996).
[CrossRef] [PubMed]

W. A. Clarkson, C. Bollig, P. J. Hardman, D. C. Hanna, “High-power diode-bar-pumped Nd:YLF laser at 1.053 µ,” in Conference on Lasers and Electro-Optics, Vol. 9 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), p. 323.

Hardman, P. J.

W. A. Clarkson, C. Bollig, P. J. Hardman, D. C. Hanna, “High-power diode-bar-pumped Nd:YLF laser at 1.053 µ,” in Conference on Lasers and Electro-Optics, Vol. 9 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), p. 323.

Kane, T. J.

J. M. Eggleston, T. J. Kane, K. Kuhn, J. Unternahrer, R. L. Byer, “The slab geometry laser—Part I: theory,” IEEE J. Quantum Electron. QE-20, 289–300 (1984).
[CrossRef]

Keirsted, M. S.

W. L. Nighan, D. Dudley, M. S. Keirsted, “Diode-bar-pumped Nd:YVO4 lasers with >13-W TEM00 output at >50% efficiency,” in Conference on Lasers and Electro-Optics, Vol. 9 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), pp. 17–18.

Kobayashi, T.

Koechner, W.

W. Koechner, Solid-State Laser Engineering, 4th ed. (Springer–Verlag, Berlin, Germany, 1996, pp. 407–408.

Kuhn, K.

J. M. Eggleston, T. J. Kane, K. Kuhn, J. Unternahrer, R. L. Byer, “The slab geometry laser—Part I: theory,” IEEE J. Quantum Electron. QE-20, 289–300 (1984).
[CrossRef]

Larat, C.

Leger, J. R.

J. R. Leger, W. C. Goltsos, “Geometric transformation of linear diode-laser arrays for longitudinal pumping of solid-state lasers,” IEEE J. Quantum Electron. 28, 1088–1100 (1992).
[CrossRef]

Liao, Y.

J. Zhang, M. Quade, Y. Liao, S. Falter, K. M. Du, P. Loosen, “Polarization characteristics of Nd:YAG laser side-pumped by diode-laser bars,” Appl. Opt. 36, (1997).

Loosen, P.

J. Zhang, M. Quade, Y. Liao, S. Falter, K. M. Du, P. Loosen, “Polarization characteristics of Nd:YAG laser side-pumped by diode-laser bars,” Appl. Opt. 36, (1997).

Neuenschwander, B.

B. Neuenschwander, R. Weber, H. P. Weber, “Determination of the thermal lens in solid-state lasers with stable cavities,” IEEE J. Quantum Electron. 31, 1082–1087 (1995).
[CrossRef]

R. Weber, B. Neuenschwander, H. P. Weber, “High-power end-pumped composite Nd:YAG rod,” in Technical Digest, Conference on Lasers and Electro-Optics/Europe (IEEE, New York, 1996), p. 5.

Nighan, W. L.

W. L. Nighan, D. Dudley, M. S. Keirsted, “Diode-bar-pumped Nd:YVO4 lasers with >13-W TEM00 output at >50% efficiency,” in Conference on Lasers and Electro-Optics, Vol. 9 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), pp. 17–18.

Pocholle, J. P.

Quade, M.

J. Zhang, M. Quade, Y. Liao, S. Falter, K. M. Du, P. Loosen, “Polarization characteristics of Nd:YAG laser side-pumped by diode-laser bars,” Appl. Opt. 36, (1997).

Saito, Y.

Schwarz, M.

Unternahrer, J.

J. M. Eggleston, T. J. Kane, K. Kuhn, J. Unternahrer, R. L. Byer, “The slab geometry laser—Part I: theory,” IEEE J. Quantum Electron. QE-20, 289–300 (1984).
[CrossRef]

Weber, H. P.

B. Neuenschwander, R. Weber, H. P. Weber, “Determination of the thermal lens in solid-state lasers with stable cavities,” IEEE J. Quantum Electron. 31, 1082–1087 (1995).
[CrossRef]

R. Weber, B. Neuenschwander, H. P. Weber, “High-power end-pumped composite Nd:YAG rod,” in Technical Digest, Conference on Lasers and Electro-Optics/Europe (IEEE, New York, 1996), p. 5.

Weber, R.

B. Neuenschwander, R. Weber, H. P. Weber, “Determination of the thermal lens in solid-state lasers with stable cavities,” IEEE J. Quantum Electron. 31, 1082–1087 (1995).
[CrossRef]

R. Weber, B. Neuenschwander, H. P. Weber, “High-power end-pumped composite Nd:YAG rod,” in Technical Digest, Conference on Lasers and Electro-Optics/Europe (IEEE, New York, 1996), p. 5.

Yamaguchi, S.

Zhang, J.

J. Zhang, M. Quade, Y. Liao, S. Falter, K. M. Du, P. Loosen, “Polarization characteristics of Nd:YAG laser side-pumped by diode-laser bars,” Appl. Opt. 36, (1997).

Appl. Opt. (1)

J. Zhang, M. Quade, Y. Liao, S. Falter, K. M. Du, P. Loosen, “Polarization characteristics of Nd:YAG laser side-pumped by diode-laser bars,” Appl. Opt. 36, (1997).

IEEE J. Quantum Electron. (3)

J. M. Eggleston, T. J. Kane, K. Kuhn, J. Unternahrer, R. L. Byer, “The slab geometry laser—Part I: theory,” IEEE J. Quantum Electron. QE-20, 289–300 (1984).
[CrossRef]

J. R. Leger, W. C. Goltsos, “Geometric transformation of linear diode-laser arrays for longitudinal pumping of solid-state lasers,” IEEE J. Quantum Electron. 28, 1088–1100 (1992).
[CrossRef]

B. Neuenschwander, R. Weber, H. P. Weber, “Determination of the thermal lens in solid-state lasers with stable cavities,” IEEE J. Quantum Electron. 31, 1082–1087 (1995).
[CrossRef]

Opt. Lett. (3)

Other (5)

C. Bibeau, R. Beach, “cw and Q-switched performance of a diode end-pumped Yb:YAG laser,” in Conference on Lasers and Electro-Optics, Vol. 9 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), Postdeadline paper PD23.

R. Weber, B. Neuenschwander, H. P. Weber, “High-power end-pumped composite Nd:YAG rod,” in Technical Digest, Conference on Lasers and Electro-Optics/Europe (IEEE, New York, 1996), p. 5.

W. A. Clarkson, C. Bollig, P. J. Hardman, D. C. Hanna, “High-power diode-bar-pumped Nd:YLF laser at 1.053 µ,” in Conference on Lasers and Electro-Optics, Vol. 9 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), p. 323.

W. L. Nighan, D. Dudley, M. S. Keirsted, “Diode-bar-pumped Nd:YVO4 lasers with >13-W TEM00 output at >50% efficiency,” in Conference on Lasers and Electro-Optics, Vol. 9 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), pp. 17–18.

W. Koechner, Solid-State Laser Engineering, 4th ed. (Springer–Verlag, Berlin, Germany, 1996, pp. 407–408.

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Figures (6)

Fig. 1
Fig. 1

Schemes of the slab laser with the slab pumped (a) by pump module I only and (b) by pump modules I and II: DLI, DLII, diode lasers; M 1, M 2, plane mirrors.

Fig. 2
Fig. 2

Output power of the slab laser, end pumped with pump module I only.

Fig. 3
Fig. 3

Output power of the slab laser with different output couplers, both end pumped with modules I and II.

Fig. 4
Fig. 4

Beam-shaping technique using two step mirrors.

Fig. 5
Fig. 5

Experimental setup for the measurement of beam profiles: L1, L2, L3, L4, spherical lenses.

Fig. 6
Fig. 6

(a) Initial intensity profile and the intensity profiles of the rearranged beam (b) in the near field and (c) in the far field. The scale is in millimeters.

Equations (3)

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

Mx2=M0x2/N,
My2=M0y2×N.
N2=M0x2/M0y2.

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