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    High-efficiency frequency upconversion of 1.5 μm laser based on a doubly resonant external ring cavity with a low finesse for signal field

    A doubly resonant external ring cavity with a low finesse for the signal field is used to improve the frequency upconversion efficiency of a weak 1583 nm signal laser to 636 nm by mixing with a resonance power...

    Wei Tan, **aodong Qiu, Gang Zhao, Mengyuan Jia, Weiguang Ma in Applied Physics B (2017)