非临界相位匹配 meaning in English
noncritical phase matching
Examples
- On account of qpm can take advantage of the largest element of x tensor , and any interaction with transparency range of the material can be noncritically phase matched without walk - off angle . therefore , the conversion efficiency in longer crystal may be improved
由于准相位匹配可利用非线性光学晶体最大的二阶极化张量元，在晶体的整个通光范围内均可实现非临界相位匹配，在较长的晶体上可望实现较高的变频效率。 - We analyze the generation of external cavity frequency - doubling with knbo3 crystal theoretically . in order to get the second - order nonlinear conversion from 858nm to 429nm with knbo3 , we use non - critical type - i phase - matching to avoid the walk - off effect the corresponding optimum focusing condition is as followings : double refraction parameter b = 0 , focus parameter = 2 . 84 , optimum phase mismatch parameter = 0 . 574 . based on the theoretical analysis and numerical calculations , we obtain the ideal nonlinear conversion coefficient about 1 . 45 % / w with crystal length of 7mm and 2 . 07 % / w with crystal length of 10mm at the phase - matching temperature around 23 . 50c
根据对其倍频原理及性能的分析讨论，在用该晶体完成波长从858nm到429nm的二阶非线性转换时，采用非临界相位匹配条件(此时无离散效应，对应的双折射参数b = 0 ，共焦长度为= 2 . 84 ，最佳相位失配因子为= 0 . 574 ) ，在相位匹配温度约为23 . 5时，理论上通过计算得到理想情况下非线性转换系数约为1 . 45 / w (长度为7mm ) ， 2 . 07 / w (长度为10mm ) 。