Abstract
A 2052.96 nm single-longitudinal-mode pulsed Ho:YVO4 MOPA system was demonstrated for the first time. The pulsed Ho:YVO4 MOPA system consisted of a unidirectional ring passively Q-switched oscillator and a single-pass amplifier. By inserting an isolator, a half-wave plate and a Cr2+:ZnS plate into the ring Ho:YVO4 oscillator cavity, the single-longitudinal-mode pulsed laser was achieved with an average output power of 1.02 W with pulse width of 910 ns and pulse repetition frequency (PRF) of 67 kHz. Using the residual (non-absorbed) pump power of the oscillator as pump, the single-pass pulsed Ho:YVO4 amplifier obtained an average output power of 1.67 W. The total optical-to-optical efficiency of the pulsed Ho:YVO4 MOPA system was 14.3%. Single-longitudinal-mode pulsed MOPA system based on isolator and Cr2+:ZnS around 2 µm has not been reported yet to the best of our knowledge.
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