| 摘要 |
A novel Q-switch device enables significant quality and value improvement fo r a Q-switched laser system by achieving a significant reduction of mode-beati ng noise during the pulsed output. The origin of mode-beating noise in a Q- switched laser is a result of high gain availability and amplification of competing standing-waves in formation, whose optical frequency is a product of natural selection via spatial hole burning in the gain medium. The novel Q- switch device employs an active, electro-optics or acousto-optics, Q-switch in combination with a saturable absorber device, to provide an optimized soft opening of the optical path and a controlled timing of a Q-switched laser. This novel combination offers larger modulation loss than otherwise possible with the active modulator alone, and it allows for higher gain build-up ener gy extraction efficiency. Specifically, it will enable a low-voltage modulator (< 100 V) for high gain (small-signal gain > 10) and Q-switched operation at high repetition rate (>10 kHz).
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