The rational harmonic mode-locking has become a research subject of intense interest due to its application on the generation of ultra- high repetition frequency optical pulse train.
有理数谐波锁模技术是产生高速超短脉冲的重要技术之一，其光时分复用通信技术等领域中有重要的应用价值。
2
It mainly consists of harmonicgeneration, sum-frequency generation, difference-frequency generation, optical parametric oscillation and etc.
它主要由二次谐波产生、和频产生、差频产生、光参量振荡等构成。
3
The harmonic amplitude equation and the generation efficiency of nonlinear optical frequency conversion(NOFC)in quasi-phase-matching (QPM) were discussed.