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首页> 外文期刊>Applied optics >Evaluating the effect of transmissive optic thermal lensing on laser beam quality with a Shack-Hartmann wave-front sensor
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Evaluating the effect of transmissive optic thermal lensing on laser beam quality with a Shack-Hartmann wave-front sensor

机译：使用Shack-Hartmann波前传感器评估透射光学热透镜对激光束质量的影响

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摘要

We examine wave-front distortion caused by high-power lasers on transmissive optics using a Shack-Hartmann wave-front sensor. The coupling coefficient for a thermally aberrated Gaussian beam to the TEM_(00) mode of a cavity was determined as a function of magnitude of the thermally induced aberration. One wave of thermally induced phase aberration between the Gaussian intensity peak and the 1/e~(2) radius of the intensity profile reduces the power-coupling coefficient to the TEM_(00) mode of the cavity to 4.5% with no compensation. With optimal focus compensation the power coupling is increased to 79%. The theoretical shape of the thermally induced optical phase aberration is compared with measurements made in a neutral-density filter glass, Faraday glass, and lithium niobate. The agreement between the theoretical and the measured thermal aberration profiles is within the rms wave-front measurement sensitivity of the Shack-Hartmann wave-front sensor, which is a few nanometers.
机译：我们使用Shack-Hartmann波前传感器检查由高功率激光器在透射光学器件上引起的波前畸变。确定热像差的高斯光束与腔的TEM_（00）模的耦合系数，作为热感应像差大小的函数。高斯强度峰值和强度分布的1 / e〜（2）半径之间的一波热感应相位像差波将腔的TEM_（00）模的功率耦合系数降低到4.5％，而没有补偿。通过最佳聚焦补偿，功率耦合提高到79％。将热致光学相差的理论形状与在中性密度滤光玻璃，法拉第玻璃和铌酸锂中进行的测量进行比较。理论和测量的热像差曲线之间的一致性在Shack-Hartmann波前传感器的rms波前测量灵敏度之内，该灵敏度为几纳米。

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