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理论上研究了单轴晶体Ⅰ类匹配时相位畸变光束二次谐波的转换 ,其中考虑了衍射、离散效应 ,给出了相位畸变小信号解。在此基础上 ,以KDP晶体为例分析并给出了有像差高斯光束的转换效率随晶体长度的变化规律。对于任意光强分布和有任意相位畸变光束的谐波转换也是同样适用的
In theory, the transformation of the second harmonic of the phase-distorted beam in a uniaxial crystal I-type matching is studied, in which the diffraction and dispersion effects are considered and the phase distortion small-signal solution is given. On this basis, taking the KDP crystal as an example, the changing law of the conversion efficiency of the aberrated Gaussian beam with the length of the crystal is given. The same applies to the harmonic conversion of an arbitrary light intensity distribution and an arbitrary phase-distorted beam