Abstract

We describe effective suppression of beam divergence for a high-power laser diode bar by use of an external-cavity technique. Nineteen off-axis external-cavity laser diodes of the high-power laser diode are formed by feedback with a stripe mirror. At three times the threshold current, the diverging angle 1/e2 of the external-cavity laser diode bar is reduced to 1.5° from 6.6° (free running) with 14.1-W peak output power and 70.4% of the radiated power of the free-running state without the external cavity. This technique effectively improves the beam quality of the high-power laser diode bar.

© 2004 Optical Society of America

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References

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    [CrossRef] [PubMed]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]

2002 (1)

2001 (1)

P. Y. Wang, Laser Focus World 37(12), 115 (2001).

1998 (1)

S. Heinemann and L. Leininger, Proc. SPIE 3267, 116 (1998).
[CrossRef]

1996 (2)

R. M. R. Pillai and E. M. Garmire, IEEE J. Quantum Electron. 32, 996 (1996).
[CrossRef]

W. A. Clarkson and D. C. Hanna, Opt. Lett. 21, 375 (1996).
[CrossRef] [PubMed]

1995 (1)

S. Yamaguchi, T. Kobayashi, Y. Saito, and K. Chiba, Opt. Lett 20, 898 (1995).
[CrossRef] [PubMed]

Chiba, K.

S. Yamaguchi, T. Kobayashi, Y. Saito, and K. Chiba, Opt. Lett 20, 898 (1995).
[CrossRef] [PubMed]

Clarkson, W. A.

Garmire, E. M.

R. M. R. Pillai and E. M. Garmire, IEEE J. Quantum Electron. 32, 996 (1996).
[CrossRef]

Hanna, D. C.

Heinemann, S.

S. Heinemann and L. Leininger, Proc. SPIE 3267, 116 (1998).
[CrossRef]

Kobayashi, T.

S. Yamaguchi, T. Kobayashi, Y. Saito, and K. Chiba, Opt. Lett 20, 898 (1995).
[CrossRef] [PubMed]

Leininger, L.

S. Heinemann and L. Leininger, Proc. SPIE 3267, 116 (1998).
[CrossRef]

Menzel, R.

Pillai, R. M. R.

R. M. R. Pillai and E. M. Garmire, IEEE J. Quantum Electron. 32, 996 (1996).
[CrossRef]

Raab, V.

Saito, Y.

S. Yamaguchi, T. Kobayashi, Y. Saito, and K. Chiba, Opt. Lett 20, 898 (1995).
[CrossRef] [PubMed]

Wang, P. Y.

P. Y. Wang, Laser Focus World 37(12), 115 (2001).

Yamaguchi, S.

S. Yamaguchi, T. Kobayashi, Y. Saito, and K. Chiba, Opt. Lett 20, 898 (1995).
[CrossRef] [PubMed]

IEEE J. Quantum Electron. (1)

R. M. R. Pillai and E. M. Garmire, IEEE J. Quantum Electron. 32, 996 (1996).
[CrossRef]

Laser Focus World (1)

P. Y. Wang, Laser Focus World 37(12), 115 (2001).

Opt. Lett (1)

S. Yamaguchi, T. Kobayashi, Y. Saito, and K. Chiba, Opt. Lett 20, 898 (1995).
[CrossRef] [PubMed]

Opt. Lett. (2)

Proc. SPIE (1)

S. Heinemann and L. Leininger, Proc. SPIE 3267, 116 (1998).
[CrossRef]

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Figures (4)

Fig. 1
Fig. 1

Schematic of the external-cavity laser diode bar: α, off-axis angle, which is the angle between the normal axis of the stripe mirror and the optical axis of the free-running laser diode bar; β, emission angle of the laser diode bar with the optical axis of the free-running laser diode bar.

Fig. 2
Fig. 2

Patterns for the laser diode bar (a) without the stripe mirror and (b) with the external cavity, at a 25-A drive current.

Fig. 3
Fig. 3

Divergences of the free-running laser diode bar and the external-cavity laser diode bar: triangles, without the stripe mirror; squares, with the external cavity.

Fig. 4
Fig. 4

Output power and output efficiency versus driver current of the laser diode bar: Triangles, output power without the stripe mirror; squares, output power with the external cavity; circle, output efficiency with the external cavity.

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