论文信息 - Beam quality improvement of laser diode array by using off-axis external cavity.

Beam quality improvement of laser diode array by using off-axis external cavity.

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%.

Zhou Jun | Lou Qihong | Dong Jingxing | Su Zhouping | Wei Runrong

[1] K. Shinoda,et al. Effective suppression of beam divergence for a high-power laser diode bar by an external-cavity technique. , 2004, Optics letters.

[2] Paul Michael Petersen,et al. Improvement of the beam quality of a 1000-μm-wide broad-area diode laser with self-injection phase locking in an external cavity , 2004, SPIE LASE.

[3] Hirofumi Kan,et al. Effective bandwidth reduction for a high-power laser-diode array by an external-cavity technique. , 2005, Optics letters.

[4] Elsa Garmire,et al. Paraxial-misalignment insensitive external-cavity semiconductor-laser array emitting near-diffraction limited single-lobed beam , 1996 .

[5] Stefan Andersson-Engels,et al. Improvement of spatial and temporal coherence of a broad area laser diode using an external-cavity design with double grating feedback. , 2004, Optics express.

[6] Peter Y. Wang. Beam-shaping optics deliver high-power beams , 2001 .

[7] R. Frey,et al. A broad-area mode-coupling model for multiple-stripe semiconductor lasers , 1990 .

[8] S. Andersson-Engels,et al. Improvement of brightness and output power of high-power laser diodes in the visible spectral region , 2003 .

[9] P. Petersen,et al. Improvement of the beam quality of a broad-area diode laser using double feedback from two external mirrors , 2004 .

[10] D. Hanna,et al. Two-mirror beam-shaping technique for high-power diode bars. , 1996, Optics letters.