We report on a technique of passively Q switching an Er:YAG laser operating at 2.94 μm. The Q switch consists of a high refractive index prism having one total internal reflection surface in contact with an absorbing liquid. The initial losses were achieved via attenuated total reflection. Using the above Q switch, pulses with up to 85 mJ having 130–140 ns pulse width were generated. The output was linearly polarized and the spacial beam profile was near TEM00. The laser was operated at 2 Hz repetition rate.
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Vodopyanov et al. (1998) studied this question.
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