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This paper reports recent development on a semi-monolithic entangle cavity doubly resonant (ECOPO) pumped by a nanosecond passively Q-switched Nd:YAG laser. The ECOPO consists of a periodically poled lithium niobate crystal and four mirrors. A stable single longitudinal mode output, a fine continuous tuning and a low threshold of oscillation is obtained which is well suited for gas sensing applications.
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