Abstract

We fabricated a compact diode side-pumped Nd:YAG laser with a diffusive reflector, in which the diode laser power is transferred directly into the threefold symmetric diffusive cavity through long narrow slits. With a 7.5% output coupler in a linear resonator, we obtained 62.4-W multimode output power with an optical slope efficiency of 53.4% at a diode power of 182 W, which corresponds to an optical-to-optical efficiency of 34.3%. The optical slope efficiency increased to 55.5% when we used an 11% output coupler. From the leakage power analysis method, the pumping efficiency was measured to be approximately 82%. We discuss the thermal lens and the slope efficiency with respect to absorbed power that is derived from the measured pumping efficiency.

© 1999 Optical Society of America

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References

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  1. T. Y. Fan, R. L. Byer, “Diode laser-pumped solid-state lasers,” IEEE J. Quantum Electron. 24, 895–912 (1988).
    [CrossRef]
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    [CrossRef] [PubMed]
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    [CrossRef]
  6. D. Golla, S. Knoke, W. Schöne, A. Tünnermann, H. Schmidt, “High power continuous-wave diode-laser-pumped Nd:YAG laser,” Appl. Phys. B 58, 389–392 (1994).
    [CrossRef]
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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    [CrossRef]
  10. T. Kojima, K. Yasui, “Efficient diode side-pumping configuration of a Nd:YAG rod laser with a diffusive cavity,” Appl. Opt. 36, 4981–4984 (1997).
    [CrossRef] [PubMed]
  11. S. Konno, S. Fujikawa, K. Yasui, “80 W cw TEM00 1064 nm beam generation by use of a laser-diode-side-pumped Nd:YAG rod laser,” Appl. Phys. Lett. 77, 2650–2651 (1997).
    [CrossRef]
  12. S. Konno, K. Yasui, “Efficient high-power green beam generation by use of an intracavity frequency-doubled laser-diode-pumped Q-switched Nd:YAG laser,” Appl. Opt. 37, 551–554 (1998).
    [CrossRef]
  13. W. Koechner, Solid-State Laser Engineering, 4th ed. (Springer-Verlag, Berlin, 1996), Chap. 7.
    [CrossRef]
  14. A. E. Siegman, Lasers (University Science, Mill Valley, Calif., 1986), Chap. 6.

1998 (1)

1997 (2)

T. Kojima, K. Yasui, “Efficient diode side-pumping configuration of a Nd:YAG rod laser with a diffusive cavity,” Appl. Opt. 36, 4981–4984 (1997).
[CrossRef] [PubMed]

S. Konno, S. Fujikawa, K. Yasui, “80 W cw TEM00 1064 nm beam generation by use of a laser-diode-side-pumped Nd:YAG rod laser,” Appl. Phys. Lett. 77, 2650–2651 (1997).
[CrossRef]

1996 (3)

1995 (1)

1994 (1)

D. Golla, S. Knoke, W. Schöne, A. Tünnermann, H. Schmidt, “High power continuous-wave diode-laser-pumped Nd:YAG laser,” Appl. Phys. B 58, 389–392 (1994).
[CrossRef]

1993 (2)

D. Golla, I. Freitag, H. Zellmer, W. Schöne, I. Kröpke, H. Welling, “15W single-frequency operation of a cw, diode laser-pumped Nd:YAG ring laser,” Opt. Commun. 98, 86–90 (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]

1992 (1)

1988 (1)

T. Y. Fan, R. L. Byer, “Diode laser-pumped solid-state lasers,” IEEE J. Quantum Electron. 24, 895–912 (1988).
[CrossRef]

Bode, M.

Bowers, M. S.

Brand, T.

Byer, R. L.

T. Y. Fan, R. L. Byer, “Diode laser-pumped solid-state lasers,” IEEE J. Quantum Electron. 24, 895–912 (1988).
[CrossRef]

Clarkson, W. A.

Fan, T. Y.

T. Y. Fan, R. L. Byer, “Diode laser-pumped solid-state lasers,” IEEE J. Quantum Electron. 24, 895–912 (1988).
[CrossRef]

Freitag, I.

D. Golla, I. Freitag, H. Zellmer, W. Schöne, I. Kröpke, H. Welling, “15W single-frequency operation of a cw, diode laser-pumped Nd:YAG ring laser,” Opt. Commun. 98, 86–90 (1993).
[CrossRef]

Fujikawa, S.

S. Konno, S. Fujikawa, K. Yasui, “80 W cw TEM00 1064 nm beam generation by use of a laser-diode-side-pumped Nd:YAG rod laser,” Appl. Phys. Lett. 77, 2650–2651 (1997).
[CrossRef]

Gilbert, M.

Golla, D.

D. Golla, M. Bode, S. Knoke, W. Schöne, A. Tünnermann, “62-W cw TEM00 Nd:YAG laser side-pumped by fiber-coupled diode lasers,” Opt. Lett. 21, 210–212 (1996).
[CrossRef] [PubMed]

D. Golla, S. Knoke, W. Schöne, A. Tünnermann, H. Schmidt, “High power continuous-wave diode-laser-pumped Nd:YAG laser,” Appl. Phys. B 58, 389–392 (1994).
[CrossRef]

D. Golla, I. Freitag, H. Zellmer, W. Schöne, I. Kröpke, H. Welling, “15W single-frequency operation of a cw, diode laser-pumped Nd:YAG ring laser,” Opt. Commun. 98, 86–90 (1993).
[CrossRef]

Hanna, D. C.

Kaneda, Y.

Knoke, S.

D. Golla, M. Bode, S. Knoke, W. Schöne, A. Tünnermann, “62-W cw TEM00 Nd:YAG laser side-pumped by fiber-coupled diode lasers,” Opt. Lett. 21, 210–212 (1996).
[CrossRef] [PubMed]

D. Golla, S. Knoke, W. Schöne, A. Tünnermann, H. Schmidt, “High power continuous-wave diode-laser-pumped Nd:YAG laser,” Appl. Phys. B 58, 389–392 (1994).
[CrossRef]

Koechner, W.

W. Koechner, Solid-State Laser Engineering, 4th ed. (Springer-Verlag, Berlin, 1996), Chap. 7.
[CrossRef]

Kojima, T.

Konno, S.

S. Konno, K. Yasui, “Efficient high-power green beam generation by use of an intracavity frequency-doubled laser-diode-pumped Q-switched Nd:YAG laser,” Appl. Opt. 37, 551–554 (1998).
[CrossRef]

S. Konno, S. Fujikawa, K. Yasui, “80 W cw TEM00 1064 nm beam generation by use of a laser-diode-side-pumped Nd:YAG rod laser,” Appl. Phys. Lett. 77, 2650–2651 (1997).
[CrossRef]

Kröpke, I.

D. Golla, I. Freitag, H. Zellmer, W. Schöne, I. Kröpke, H. Welling, “15W single-frequency operation of a cw, diode laser-pumped Nd:YAG ring laser,” Opt. Commun. 98, 86–90 (1993).
[CrossRef]

Kubota, S.

Le Garrec, B. J.

Masuda, H.

Oka, M.

Razé, G. J.

Schmidt, H.

D. Golla, S. Knoke, W. Schöne, A. Tünnermann, H. Schmidt, “High power continuous-wave diode-laser-pumped Nd:YAG laser,” Appl. Phys. B 58, 389–392 (1994).
[CrossRef]

Schöne, W.

D. Golla, M. Bode, S. Knoke, W. Schöne, A. Tünnermann, “62-W cw TEM00 Nd:YAG laser side-pumped by fiber-coupled diode lasers,” Opt. Lett. 21, 210–212 (1996).
[CrossRef] [PubMed]

D. Golla, S. Knoke, W. Schöne, A. Tünnermann, H. Schmidt, “High power continuous-wave diode-laser-pumped Nd:YAG laser,” Appl. Phys. B 58, 389–392 (1994).
[CrossRef]

D. Golla, I. Freitag, H. Zellmer, W. Schöne, I. Kröpke, H. Welling, “15W single-frequency operation of a cw, diode laser-pumped Nd:YAG ring laser,” Opt. Commun. 98, 86–90 (1993).
[CrossRef]

Seamans, J. F.

Siegman, A. E.

A. E. Siegman, Lasers (University Science, Mill Valley, Calif., 1986), Chap. 6.

Thro, P. Y.

Tidwell, S. C.

Tünnermann, A.

D. Golla, M. Bode, S. Knoke, W. Schöne, A. Tünnermann, “62-W cw TEM00 Nd:YAG laser side-pumped by fiber-coupled diode lasers,” Opt. Lett. 21, 210–212 (1996).
[CrossRef] [PubMed]

D. Golla, S. Knoke, W. Schöne, A. Tünnermann, H. Schmidt, “High power continuous-wave diode-laser-pumped Nd:YAG laser,” Appl. Phys. B 58, 389–392 (1994).
[CrossRef]

Welling, H.

D. Golla, I. Freitag, H. Zellmer, W. Schöne, I. Kröpke, H. Welling, “15W single-frequency operation of a cw, diode laser-pumped Nd:YAG ring laser,” Opt. Commun. 98, 86–90 (1993).
[CrossRef]

Yasui, K.

Zellmer, H.

D. Golla, I. Freitag, H. Zellmer, W. Schöne, I. Kröpke, H. Welling, “15W single-frequency operation of a cw, diode laser-pumped Nd:YAG ring laser,” Opt. Commun. 98, 86–90 (1993).
[CrossRef]

Appl. Opt. (2)

Appl. Phys. B (1)

D. Golla, S. Knoke, W. Schöne, A. Tünnermann, H. Schmidt, “High power continuous-wave diode-laser-pumped Nd:YAG laser,” Appl. Phys. B 58, 389–392 (1994).
[CrossRef]

Appl. Phys. Lett. (1)

S. Konno, S. Fujikawa, K. Yasui, “80 W cw TEM00 1064 nm beam generation by use of a laser-diode-side-pumped Nd:YAG rod laser,” Appl. Phys. Lett. 77, 2650–2651 (1997).
[CrossRef]

IEEE J. Quantum Electron. (1)

T. Y. Fan, R. L. Byer, “Diode laser-pumped solid-state lasers,” IEEE J. Quantum Electron. 24, 895–912 (1988).
[CrossRef]

Opt. Commun. (1)

D. Golla, I. Freitag, H. Zellmer, W. Schöne, I. Kröpke, H. Welling, “15W single-frequency operation of a cw, diode laser-pumped Nd:YAG ring laser,” Opt. Commun. 98, 86–90 (1993).
[CrossRef]

Opt. Lett. (6)

Other (2)

W. Koechner, Solid-State Laser Engineering, 4th ed. (Springer-Verlag, Berlin, 1996), Chap. 7.
[CrossRef]

A. E. Siegman, Lasers (University Science, Mill Valley, Calif., 1986), Chap. 6.

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Figures (8)

Fig. 1
Fig. 1

(a) Schematic of a threefold symmetric pump module. The inner and outer diameters of the diffusive reflector are 12 and 20 mm, respectively. (b) Side view of the pump head. An alignment rod was used instead of a Nd:YAG rod for precision alignment of diode arrays on the center of the slit. In the alignment process, no water flows through the flow tube.

Fig. 2
Fig. 2

Typical image of aligned diode arrays on the center of a slit (0.7-mm width). The bright diode arrays and the boundary of a slit can be seen.

Fig. 3
Fig. 3

Fluorescence image of the rod detected by a CCD camera. It shows a nearly uniform distribution through the cross section of the rod.

Fig. 4
Fig. 4

Multimode output power with respect to the pump power at various transmittances (T) of the output coupler. SE is slope efficiency.

Fig. 5
Fig. 5

Spatial pattern of the multimode beam measured at a distance of 30 cm from the output coupler.

Fig. 6
Fig. 6

Measured focal length of a thermally induced lens and its reciprocal focal length. The fitted lines have finite offset values.

Fig. 7
Fig. 7

Pumping efficiency measured by the leakage power analysis method. The pumping efficiency changes rapidly above 100-W pump power.

Fig. 8
Fig. 8

Reciprocal focal length and output power with respect to the absorbed pump power.

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