Abstract

A combined end and side pump approach for a YAG laser pumped by a laser diode is proposed. The theoretical analysis of the total pump efficiency of the end and side pump module is presented. A laser-diode-pumped YAG laser is successfully demonstrated by use of this pump configuration. The experimental pump threshold is 81.2 mJ, the maximum output is 4.4 mJ, and the optical efficiency is approximately 3.1% for Q-switched operation of the YAG laser.

© 1998 Optical Society of America

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References

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  1. H. Fisher, R. D. Mead, A. J. W. Brown, S. C. Tidwell, C. E. Hamilton, C. I. Miyake, “Diode-end-pumped solid state lasers,” in Diode Pumping of Average-Power Solid State Lasers, G. F. Albrecht, R. J. Beach, S. P. Velsko, eds., Proc. SPIE1865, 36–42 (1993).
    [CrossRef]
  2. H. R. Verdun, T. Chuang, “Efficient TEM00-mode operation of a Nd:YAG laser end pumped by a three-bar high-power diode-laser array,” Opt. Lett. 17, 1000–1002 (1992).
    [CrossRef]
  3. S. Yamaguchi, H. Imai, “Efficient Nd:YAG laser end-pumped by a 1 cm aperture laser-diode bar with a GRIN lens array coupling,” IEEE J. Quantum Electron. 28, 1101–1105 (1992).
    [CrossRef]
  4. Specifications of SDL-3250 series laser diodes (Spectra Diode Laboratories, 80 Rose Orchard Way, San Jose, Calif. 95134-1365, 1995), p. 62.
  5. W. Guanghui, Z. Baoliang, Laser Beam Optics (Beijing Institute of Technology Press, Beijing, China, 1988).
  6. D. Botez, D. R. Scifries, Diode Laser Arrays (Cambridge U. Press, Cambridge, UK, 1994), p. 257.
  7. W. Koechner, Solid-State Laser Engineering (Springer-Verlag, New York, 1988), p. 49.
  8. M. Jianwei, “Intracavity frequency doubling of DH-LDA pumped Nd:YAG laser,” Acta Opt. Sin. 12, 865–868 (1992).
  9. J. Whittle, D. R. Skinner, “Transfer efficiency formula for diffusely reflecting laser pumping cavities,” Appl. Opt. 5, 1179–1182 (1966).
    [CrossRef] [PubMed]

1992 (3)

S. Yamaguchi, H. Imai, “Efficient Nd:YAG laser end-pumped by a 1 cm aperture laser-diode bar with a GRIN lens array coupling,” IEEE J. Quantum Electron. 28, 1101–1105 (1992).
[CrossRef]

M. Jianwei, “Intracavity frequency doubling of DH-LDA pumped Nd:YAG laser,” Acta Opt. Sin. 12, 865–868 (1992).

H. R. Verdun, T. Chuang, “Efficient TEM00-mode operation of a Nd:YAG laser end pumped by a three-bar high-power diode-laser array,” Opt. Lett. 17, 1000–1002 (1992).
[CrossRef]

1966 (1)

Baoliang, Z.

W. Guanghui, Z. Baoliang, Laser Beam Optics (Beijing Institute of Technology Press, Beijing, China, 1988).

Botez, D.

D. Botez, D. R. Scifries, Diode Laser Arrays (Cambridge U. Press, Cambridge, UK, 1994), p. 257.

Brown, A. J. W.

H. Fisher, R. D. Mead, A. J. W. Brown, S. C. Tidwell, C. E. Hamilton, C. I. Miyake, “Diode-end-pumped solid state lasers,” in Diode Pumping of Average-Power Solid State Lasers, G. F. Albrecht, R. J. Beach, S. P. Velsko, eds., Proc. SPIE1865, 36–42 (1993).
[CrossRef]

Chuang, T.

Fisher, H.

H. Fisher, R. D. Mead, A. J. W. Brown, S. C. Tidwell, C. E. Hamilton, C. I. Miyake, “Diode-end-pumped solid state lasers,” in Diode Pumping of Average-Power Solid State Lasers, G. F. Albrecht, R. J. Beach, S. P. Velsko, eds., Proc. SPIE1865, 36–42 (1993).
[CrossRef]

Guanghui, W.

W. Guanghui, Z. Baoliang, Laser Beam Optics (Beijing Institute of Technology Press, Beijing, China, 1988).

Hamilton, C. E.

H. Fisher, R. D. Mead, A. J. W. Brown, S. C. Tidwell, C. E. Hamilton, C. I. Miyake, “Diode-end-pumped solid state lasers,” in Diode Pumping of Average-Power Solid State Lasers, G. F. Albrecht, R. J. Beach, S. P. Velsko, eds., Proc. SPIE1865, 36–42 (1993).
[CrossRef]

Imai, H.

S. Yamaguchi, H. Imai, “Efficient Nd:YAG laser end-pumped by a 1 cm aperture laser-diode bar with a GRIN lens array coupling,” IEEE J. Quantum Electron. 28, 1101–1105 (1992).
[CrossRef]

Jianwei, M.

M. Jianwei, “Intracavity frequency doubling of DH-LDA pumped Nd:YAG laser,” Acta Opt. Sin. 12, 865–868 (1992).

Koechner, W.

W. Koechner, Solid-State Laser Engineering (Springer-Verlag, New York, 1988), p. 49.

Mead, R. D.

H. Fisher, R. D. Mead, A. J. W. Brown, S. C. Tidwell, C. E. Hamilton, C. I. Miyake, “Diode-end-pumped solid state lasers,” in Diode Pumping of Average-Power Solid State Lasers, G. F. Albrecht, R. J. Beach, S. P. Velsko, eds., Proc. SPIE1865, 36–42 (1993).
[CrossRef]

Miyake, C. I.

H. Fisher, R. D. Mead, A. J. W. Brown, S. C. Tidwell, C. E. Hamilton, C. I. Miyake, “Diode-end-pumped solid state lasers,” in Diode Pumping of Average-Power Solid State Lasers, G. F. Albrecht, R. J. Beach, S. P. Velsko, eds., Proc. SPIE1865, 36–42 (1993).
[CrossRef]

Scifries, D. R.

D. Botez, D. R. Scifries, Diode Laser Arrays (Cambridge U. Press, Cambridge, UK, 1994), p. 257.

Skinner, D. R.

Tidwell, S. C.

H. Fisher, R. D. Mead, A. J. W. Brown, S. C. Tidwell, C. E. Hamilton, C. I. Miyake, “Diode-end-pumped solid state lasers,” in Diode Pumping of Average-Power Solid State Lasers, G. F. Albrecht, R. J. Beach, S. P. Velsko, eds., Proc. SPIE1865, 36–42 (1993).
[CrossRef]

Verdun, H. R.

Whittle, J.

Yamaguchi, S.

S. Yamaguchi, H. Imai, “Efficient Nd:YAG laser end-pumped by a 1 cm aperture laser-diode bar with a GRIN lens array coupling,” IEEE J. Quantum Electron. 28, 1101–1105 (1992).
[CrossRef]

Acta Opt. Sin. (1)

M. Jianwei, “Intracavity frequency doubling of DH-LDA pumped Nd:YAG laser,” Acta Opt. Sin. 12, 865–868 (1992).

Appl. Opt. (1)

IEEE J. Quantum Electron. (1)

S. Yamaguchi, H. Imai, “Efficient Nd:YAG laser end-pumped by a 1 cm aperture laser-diode bar with a GRIN lens array coupling,” IEEE J. Quantum Electron. 28, 1101–1105 (1992).
[CrossRef]

Opt. Lett. (1)

Other (5)

H. Fisher, R. D. Mead, A. J. W. Brown, S. C. Tidwell, C. E. Hamilton, C. I. Miyake, “Diode-end-pumped solid state lasers,” in Diode Pumping of Average-Power Solid State Lasers, G. F. Albrecht, R. J. Beach, S. P. Velsko, eds., Proc. SPIE1865, 36–42 (1993).
[CrossRef]

Specifications of SDL-3250 series laser diodes (Spectra Diode Laboratories, 80 Rose Orchard Way, San Jose, Calif. 95134-1365, 1995), p. 62.

W. Guanghui, Z. Baoliang, Laser Beam Optics (Beijing Institute of Technology Press, Beijing, China, 1988).

D. Botez, D. R. Scifries, Diode Laser Arrays (Cambridge U. Press, Cambridge, UK, 1994), p. 257.

W. Koechner, Solid-State Laser Engineering (Springer-Verlag, New York, 1988), p. 49.

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Figures (11)

Fig. 1
Fig. 1

Principal structure of the ES pump module (PM): (a) in the plane perpendicular to the LD junction and (b) in the plane parallel to the LD junction.

Fig. 2
Fig. 2

Structure of the LD.

Fig. 3
Fig. 3

Gaussian beam distribution of a LD chip: (a) in the LD, (b) in the plane parallel to the junction, (c) in the plane perpendicular to the junction.

Fig. 4
Fig. 4

Total pump efficiency versus D y , and L m for Gaussian distribution of LD light.

Fig. 5
Fig. 5

Experimental setup of a YAG laser ES pumped by a LD: YAG, YAG rod; PM, ES pump module; PL, polarizer; QS, Q-switch, M2, output mirror of the 1.06-μm laser; FL, focal lens for SHG; KTP, nonlinear optical crystal; NF, neutral filter.

Fig. 6
Fig. 6

Energy of a free lasing YAG laser ES pumped by a LD.

Fig. 7
Fig. 7

Optical efficiency of a free lasing YAG laser ES pumped by a LD.

Fig. 8
Fig. 8

Energy of a Q-switched YAG laser ES pumped by a LD.

Fig. 9
Fig. 9

Optical efficiency of a Q-switched YAG laser ES pumped by a LD.

Fig. 10
Fig. 10

SHG and the fundamental energy versus pump laser from a LD.

Fig. 11
Fig. 11

SHG efficiency and the fundamental energy versus pump laser from a LD.

Tables (1)

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Table 1 Absorption Rate of a YAG Rod with Different Diameters

Equations (10)

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U i x ,   y ,   z = w 0 x w 0 y w x z w y z 1 / 2 exp - x 2 w x z 2 + y 2 w y z 2 ,
w x z 2 = w 0 x 2 1 + λ z π w 0 x 2 2 ,
w x z 2 = w 0 y 2 1 + λ z - s π w 0 y 2 2 ,
U t x ,   y ,   z = w 0 x w 0 y w x z w y z 1 / 2 i exp - x + ip 2 w x 2 z + y 2 w y 2 z i = - 1 ,   - 2 ,   0 ,   1 ,   2 ,
E PY     Y   | U t x ,   y | 2 d x d y ,
E P     T   | U t x ,   y | 2 d x d y ,
E ge = tE py E p ,
E gs = 1 - E py E p tS e + S s A 1 tS e + S s A 1 + S P A 2 + S d A 3 ,
E gt = E gs + E ge .
A 1 = 1.1146 - 0.1376 n y × 1 - exp - 1.868 - 0.2104 n y α D y / 2 + 0.3246 - 0.118 n y α 2 D y / 2 2 ,

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