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在前面两讲,我们介绍了激光原理和激光器.要把激光器广泛应用于工农业生产、国防建设和科学实验中去,还要根据不同的用途,采用一些特殊的方法和装置.本讲介绍几种最常用的激光技术,包括激光调Q、调制、倍频、选模、稳频、放大和锁模等项技术.一、激光调Q(Q开关)技术在第二讲中,我们介绍过脉冲运转的固体激光器,它比连续运转的激光器,一般具有较高的峰值功率,可用于材料加工方面.但是,它的激光输出的脉冲宽度(也叫脉冲时间)比较宽(通常为毫秒数量级),所以平均功率低.这种普通的脉冲激光器还不能适用于激光测距、激光雷达、激光脉码通信等,而要采用激光调Q技术,以产生适用的巨脉冲的激
In the previous two talks, we introduced the principle of lasers and lasers, lasers should be widely used in industrial and agricultural production, national defense construction and scientific experiments, but also according to different uses, using some special methods and devices. The most commonly used laser technology, including laser Q-switched, modulation, frequency doubling, mode selection, frequency stabilization, amplification and mode locking, etc. First, the laser Q (Q switch) technology In the second talk, we introduced Pulse-operated solid-state lasers, which typically have higher peak powers than continuous-mode lasers, can be used for material processing, but their laser output pulse width (also called pulse time) is relatively wide (typically on the order of milliseconds) , So the average power is low.This ordinary pulsed laser can not be applied to laser ranging, laser radar, laser pulse code communications, but to use laser Q-switched technology to produce a suitable giant pulse excitation