Abstract

A novel off-axis external cavity is designed for laser diode array to improve the beam quality. In this external cavity, a circle aperture with variable size is used as a spatial filter. The diameter of aperture is optimized to 1.2mm and the off-axis angle of external cavity is optimized at 2.6 deg. In the optimal case, the beam parameter product (BPP) of laser diode array is reduced to 121 mm.mrad from 1050 mm.mrad with external cavity optical efficiency of 81%.

© 2007 Optical Society of America

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References

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  1. E. Samsøe and P. E. Andersen, "Improvement of spatial and temporal coherence of a broad area laser diode using an external-cavity design with double grating feedback," Opt. Express 12,609 (2004).
    [CrossRef] [PubMed]
  2. S. B. Bayrama and T. E. Chupp, "Operation of a single mode external-cavity laser diode array near 780nm," Rev. Sci. Instrum 73, 4169-4171 (2002).
    [CrossRef]
  3. J. Chen, X. Wu, J. Ge, A. Hermerschmidt, and H. J. Eichler, "Broad-area laser diode with 0.02 nm bandwidth and diffraction limited output due to double external cavity feedback," Appl. Phys. Lett. 85, 525-527 (2004).
    [CrossRef]
  4. X. Gao, Y. Zheng, H. Kan, and K. Shinoda, "Effective suppression of beam divergence for a high-power laser diode bar by an external-cavity technique," Opt. Lett. 29, 361-363 (2004).
    [CrossRef] [PubMed]
  5. Y. Zheng and H. Kan, "Effective bandwidth reduction for a high-power laser-diode array by an external-cavity technique," Opt. Lett. 30,2424-2426 (2005).
    [CrossRef] [PubMed]
  6. W. A. Clarkson and D. C. Hanna, "Two-mirror beam-shaping technique for high-power diode bars," Opt. Lett. 21, 375-377 (1996).
    [CrossRef] [PubMed]
  7. P. Y. Wang, "Beam-shaping optics deliver high-power beam," Laser Focus World 37, 115-118 (2001)
  8. J.-M. Verdell and R. Freyieee, "A broad-area mode-coupling model for multiple stripe semiconductor lasers," IEEE J. Quantum Electron. 26, 270-279(1990).
    [CrossRef]
  9. R. M. R. Pillai and E. M. Garmire, "Paraxial-misalignment insensitive external-cavity semiconductor-laser array emitting near-diffraction limited single-lobed beam," IEEE J. Quantum Electron. 32, 996-1008 (1996).
    [CrossRef]
  10. M. Chi, N.-S. Bøgh, B. Thestrup and P. M. Petersen, "Improvement of the beam quality of a broad-area diode laser using double feedback from two external mirrors," Appl. Phys. Lett. 85, 1107-1109 (2004).
    [CrossRef]
  11. M. Chi, B. Thestrup, and P. M. Petersen, "Improvement of the beam quality of a 1000 μm wide broad-area diode laser with self-injection phase locking in an external cavity," Proc. SPIE 5336, 33-37 (2004)
    [CrossRef]
  12. E. Samsøe, P. Malm, P. E. Andersen, P. M. Petersen and S. Andersson-Engels, "Improvement of brightness and output power of high-power laser diodes in the visible spectral region," Opt. Commun. 219, 369-375 (2003).
    [CrossRef]

2005

2004

X. Gao, Y. Zheng, H. Kan, and K. Shinoda, "Effective suppression of beam divergence for a high-power laser diode bar by an external-cavity technique," Opt. Lett. 29, 361-363 (2004).
[CrossRef] [PubMed]

E. Samsøe and P. E. Andersen, "Improvement of spatial and temporal coherence of a broad area laser diode using an external-cavity design with double grating feedback," Opt. Express 12,609 (2004).
[CrossRef] [PubMed]

J. Chen, X. Wu, J. Ge, A. Hermerschmidt, and H. J. Eichler, "Broad-area laser diode with 0.02 nm bandwidth and diffraction limited output due to double external cavity feedback," Appl. Phys. Lett. 85, 525-527 (2004).
[CrossRef]

M. Chi, N.-S. Bøgh, B. Thestrup and P. M. Petersen, "Improvement of the beam quality of a broad-area diode laser using double feedback from two external mirrors," Appl. Phys. Lett. 85, 1107-1109 (2004).
[CrossRef]

M. Chi, B. Thestrup, and P. M. Petersen, "Improvement of the beam quality of a 1000 μm wide broad-area diode laser with self-injection phase locking in an external cavity," Proc. SPIE 5336, 33-37 (2004)
[CrossRef]

2003

E. Samsøe, P. Malm, P. E. Andersen, P. M. Petersen and S. Andersson-Engels, "Improvement of brightness and output power of high-power laser diodes in the visible spectral region," Opt. Commun. 219, 369-375 (2003).
[CrossRef]

2002

S. B. Bayrama and T. E. Chupp, "Operation of a single mode external-cavity laser diode array near 780nm," Rev. Sci. Instrum 73, 4169-4171 (2002).
[CrossRef]

2001

P. Y. Wang, "Beam-shaping optics deliver high-power beam," Laser Focus World 37, 115-118 (2001)

1996

R. M. R. Pillai and E. M. Garmire, "Paraxial-misalignment insensitive external-cavity semiconductor-laser array emitting near-diffraction limited single-lobed beam," IEEE J. Quantum Electron. 32, 996-1008 (1996).
[CrossRef]

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

1990

J.-M. Verdell and R. Freyieee, "A broad-area mode-coupling model for multiple stripe semiconductor lasers," IEEE J. Quantum Electron. 26, 270-279(1990).
[CrossRef]

Appl. Phys. Lett.

J. Chen, X. Wu, J. Ge, A. Hermerschmidt, and H. J. Eichler, "Broad-area laser diode with 0.02 nm bandwidth and diffraction limited output due to double external cavity feedback," Appl. Phys. Lett. 85, 525-527 (2004).
[CrossRef]

M. Chi, N.-S. Bøgh, B. Thestrup and P. M. Petersen, "Improvement of the beam quality of a broad-area diode laser using double feedback from two external mirrors," Appl. Phys. Lett. 85, 1107-1109 (2004).
[CrossRef]

IEEE J. Quantum Electron.

J.-M. Verdell and R. Freyieee, "A broad-area mode-coupling model for multiple stripe semiconductor lasers," IEEE J. Quantum Electron. 26, 270-279(1990).
[CrossRef]

R. M. R. Pillai and E. M. Garmire, "Paraxial-misalignment insensitive external-cavity semiconductor-laser array emitting near-diffraction limited single-lobed beam," IEEE J. Quantum Electron. 32, 996-1008 (1996).
[CrossRef]

Laser Focus World

P. Y. Wang, "Beam-shaping optics deliver high-power beam," Laser Focus World 37, 115-118 (2001)

Opt. Commun.

E. Samsøe, P. Malm, P. E. Andersen, P. M. Petersen and S. Andersson-Engels, "Improvement of brightness and output power of high-power laser diodes in the visible spectral region," Opt. Commun. 219, 369-375 (2003).
[CrossRef]

Opt. Express

Opt. Lett.

Proc. SPIE

M. Chi, B. Thestrup, and P. M. Petersen, "Improvement of the beam quality of a 1000 μm wide broad-area diode laser with self-injection phase locking in an external cavity," Proc. SPIE 5336, 33-37 (2004)
[CrossRef]

Rev. Sci. Instrum

S. B. Bayrama and T. E. Chupp, "Operation of a single mode external-cavity laser diode array near 780nm," Rev. Sci. Instrum 73, 4169-4171 (2002).
[CrossRef]

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Figures (4)

Fig. 1.
Fig. 1.

Experimental setup

Fig. 2.
Fig. 2.

BPP variations of free-running LDA and of ECLDA versus the driver current

Fig. 3.
Fig. 3.

BPP variation of ECLDA versus various aperture positions

Fig. 4.
Fig. 4.

BPP variation of ECLDA versus various aperture sizes

Equations (1)

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θ = D f 1

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