Abstract
In order to manufacture a pulse single-frequency laser with master oscillator power amplifier( MOPA) structure used for laser coherence imaging,the properties of acousto-optic Q-switched pulse single-frequency 1 064 nm laser used as MOPA laser seed,and properties of extra-cavity double frequency green laser were studied in the paer. 1 064 nm pulse laser output with more than 20 ns pulse width was realized by means of acousto-optics Q-switch,and single-frequency running was realized by means of loop cavity and etalons with different thickness. The linewidth of 1 064 nm and 532 nm pulse lasers were studied. The experiment results show that there is almost complete coherence in all of the pulse width; 1 064 nm pulse single-frequency laserwith 28 nm pulse width and 6. 5 k W peak power and 532 nm laser with 20 ns pulse width and 0. 5 k W peak power are obtained respectively. The efficiency of extra-cavity double-frequency is about 5. 6%. The effect of laser pulse reduction by extra-cavity double-frequency is also validated by experiments.
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