Abstract
The Alexandrite laser belongs to the class of vibronical lasers. The broad spectral laser gain of Alexandrite laser gain of Alexandrite suggests the possibility to generate femto-second laser pulses with passive mode locking. Experiments showed, however, that a limit of pulsewidth shortening is reached near 10 ps. This effect is caused by the limited mode-locking capability of the passive absorber. The results of eight different passive absorbers used to generate mode locking are presented. The effect of bandwidth narrowing of the laser emission spectrum of Alexandrite on pulsewidth and pulse-train energy was measured for these absorbers. The dependence of laser output energy with the temperature on the active medium was also investigated.
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