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Four high average power, high repetition rate, ns pulse laser beams have been coherently combined by single-detector, binary-tree filled-aperture coherent beam combining technique. For the present photonic crystal fiber based MOPA system, over 400 Watts combined average output power with 0.75 combining efficiency has been obtained. Combining efficiency degradation sources have been identified and...
We report a new compact high power laser system using zig-zag optical path based on the cryogenic Yb:YAG total-reflection active-mirror laser for ten-kilowatts. The thermal analyses of the laser have also been discussed.
we proposed a novel oscillator configuration called "TRAM" (Total-Reflection Active-Mirror) laser with a cryogenically cooled (under 100 K) Yb:YAG. We reported on TRAM laser experiments using a composite all-ceramics Yb:YAG, with no high-reflection coating and was directly cooled with liquid nitrogen. The obtained output power was 273 W with a slope efficiency of 72%, which to the best of...
Pulse lasers with both of high pulse energy and high average power are strongly desired for various industrial and scientific applications. In such laser systems, the nonlinear refractive index is a critical factor for spatial phase distortion and the B-integral has been used to evaluate it. In several years, the cooled Yb: YAG is researched aggressively due to its improved thermal conductivity, controlled...
A diode-pumped Q-switched laser oscillator with a liquid-nitrogen-cooled Yb:YAG ceramics active mirror has been demonstrated. 7.5-mJ pulse energy and 30-W average power were obtained. The maximum optical and slope efficiency were 62% and 71%, respectively.
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