论文信息 - Optimization of reflector design for diode-pumped Nd:YAG laser with single-side pumping geometry

Optimization of reflector design for diode-pumped Nd:YAG laser with single-side pumping geometry

We evaluated characteristics of various shapes of reflector to get uniform and efficient pumping of Nd:YAG rod even with single-side pumping geometry using commercial software ZEMAX and LASCAD. The combined application of the software enabled us to evaluate numerically the laser performance and absorbed pump diode profile. We tried various shape of reflector such as semi-circular, square, elliptical reflectors, and cusp-shape, to get uniform pumping. In the calculation, water flows inside the cooling tube which surrounds the Nd:YAG rod. For further improvement a planarconcave window was placed in front of the diode to enlarge pump beam divergence angle. Through several trial and error, we found optimal pumping chamber configuration for single-side pumping, which gives reasonably uniform and efficient pumping of Nd:YAG rod. The output power and pulsewidth of Q-switched laser output were optimized by varying the laser cavity length and the output coupler reflectivity.

[1] M. Gilbert,et al. High average power diode array pumped frequency doubled YAG laser , 1996 .

[2] G. C. Reali,et al. Gain shaping and beam quality in diode-laser multiarray side-pumped solid-state lasers , 1992 .

[3] A. G. Gaydon,et al. Spectrochemical Analysis , 1951, Nature.

[4] R. John Koshel,et al. Non-edge-ray design: improved optical pumping of lasers , 2004 .

[5] A. Weeks,et al. Introduction to laser diode-pumped solid state lasers , 2002 .

[6] You Wang,et al. Design of a triangular reflector for diode-pumped solid-state lasers with both high absorption efficiency and homogeneous absorption distribution , 2006 .