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Near-diffraction-limited laser beam shaping with diamond-turned aspheric optics

机译:金刚石车削非球面光学器件的近衍射极限激光束整形

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We used a pair of diamond-turned CaF2 aspheres to convert the pure TEM00 Gaussian spatial profile output of a diode-pumped Nd:YAG laser oscillator into a super-Gaussian intensity profile with a nearly flat phase front. The resulting super-Gaussian beam was nearly diffraction limited with an M-2 of 1.75; in the near field the 5-mm diameter beam retained a nominally flat-top intensity distribution without significant diffraction peaks for an excellent working distance of more than 50 cm. A 10% improvement in amplifer-energy extraction obtained by use of the reshaped beam is demonstrated. (C) 1997 Optical Society of America.
机译:我们使用一对金刚石车削的CaF2非球面将二极管泵浦的Nd:YAG激光振荡器的纯TEM00高斯空间分布输出转换为相位前部几乎平坦的超高斯强度分布。所得的超高斯光束几乎被衍射极限所限制,其M-2为1.75;在近场中,直径为5毫米的光束保持标称的平顶强度分布,而没有明显的衍射峰,因此工作距离超过50厘米。演示了通过使用重塑光束可以将放大器能量提取提高10%。 (C)1997年美国眼镜学会。

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