A Q-switched laser having a gain medium disposed within a first cavity and a second cavity whose optical path length is adjustable such that the quality of the first resonant cavity is affected. One aspect of the invention is the changing of the physical path length of the second cavity so as to effect...http://www.google.com.tw/patents/USRE34812?utm_source=gb-gplus-share專利 USRE34812 - Coupled-cavity Q-switched laser
