Presently, an all-solid-state laser in this spectral range was obtained by frequency conversion, such as frequency-doubling, sum frequency, stimulated or Raman frequency-shifted.
目前，该波段的全固态激光光源主要是利用频率变换技术，通过倍频、和频、受激拉曼频移的方法来获得。
The phase matching conditions for sum frequency generation are analyzed. The optimum phase matching angles and effective nonlinear coefficients for KTP and LBO are derived and calculated.
进行了双束激光和频相位匹配的理论分析，给出了KTP 和LBO 两种晶体在和频时的最佳相位匹配角和有效和频系数。
The second step is to compute the cluster frequency for each cluster, which is the sum of all the rule frequencies within that cluster.
第二步是计算每个集群的集群频率，这是该集群中所有规则依赖关系的总和。
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