Abstract
Abstract This paper reported a passively Q-switched green laser of LD pumped linear cavity structure by using Nd:YAG/Cr 4+ :YAG composite crystal and the type II phase matching KTP crystal. The dependence of average output power, pulse width and pulse repetition rate on pump power at different initial transmissions of Cr 4+ :YAG were measured and analyzed. With Cr 4+ :YAG of 80% initial transmission, under pump power of 13.97 W, the output average power is up to 681 mW, with pulse width of 200 ns and pulse repetition rate of 9.1 kHz. The laser operates in a fundamental mode.
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