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Pump-induced bleaching of the saturable absorber in short-pulse Nd:YAG/Cr4+:YAG passively Q-switched microchip lasers

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2 Author(s)
Zayhowski, J.J. ; MIT Lincoln Lab., Lexington, MA, USA ; Wilson, A.L., Jr.

Bleaching of the saturable absorber by pump light increases the length of the pulse generated in a passively Q-switched Nd:YAG/Cr4+:YAG microchip laser and decreases the pulse energy. This effect is greatest when transmitted pump light is nearly focused in the Cr4+:YAG and when pumping is sufficiently intense to bleach the absorption of the Nd:YAG. Both effects are important in short-pulse microchip lasers. The maximum repetition rate of a passively Q-switched Nd:YAG/Cr4+:YAG microchip laser is correlated with the pulsewidth. In general, it decreases as the pulsewidth gets shorter.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:39 ,  Issue: 12 )