Kasinski J J, Burnham R L
Opt Lett. 1997 Jul 15;22(14):1062-4. doi: 10.1364/ol.22.001062.
We used a pair of diamond-turned CaF(2) aspheres to convert the pure TEM(00) 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 50cm. A 10% improvement in amplifier-energy extraction obtained by use of the reshaped beam is demonstrated.
我们使用一对金刚石车削的CaF₂非球面镜，将二极管泵浦Nd:YAG激光振荡器输出的纯TEM(00)高斯空间分布转换为具有近似平坦相位前沿的超高斯强度分布。产生的超高斯光束几乎是衍射极限的，M²因子为1.75；在近场中，直径5毫米的光束保持名义上的平顶强度分布，没有明显的衍射峰，工作距离超过50厘米，效果极佳。实验证明，使用整形后的光束可使放大器能量提取提高10%。
