Characteristics of Single Resonant Nanosecond Pulse Optical Parametric Oscillator with Output Wavelength of 2.05 μm
(2.University of Chinese Academy of Sciences, Beijing, China 100049)
【Abstract】A KTP crystal extra-cavity single-resonant optical parametric oscillator (OPO) pumped by 1 064 nm single-frequency laser is reported, and the nanosecond laser pulse output with wavelength of 2.05 μm is obtained. In the plane-parallel cavity, two type II phase-matched KTP crystals are placed in walk-off-compensated mode. When the pump single pulse energy reaches 5 mJ at the repetition frequency of 400 Hz, a 2.05 μm signal laser output with the single pulse energy of 0.9 mJ is obtained, whose pulse width is about 3.7 ns, the corresponding pump-to-signal conversion efficiency is about 18%, and the beam quality factors M2 are 2.08, 3.03 in x, y directions, respectively.A KTP crystal extra-cavity single-resonant optical parametric oscillator(OPO)pumped by 1064nm single-frequency laser is reported,and the nanosecond laser pulse output with wavelength of 2.05μm is obtained.In the plane-parallel cavity,two type II phase-matched KTP crystals are placed in walk-off-compensated mode.When the pump single pulse energy reaches 5 mJ at repetition frequency of 400 Hz,a 2.05μm signal laser output with single pulse energy of 0.9 mJ is obtained,whose pulse width is about 3.7ns,the corresponding conversion efficiency is about 18%from pump light to signal light,and the beam quality factor M2are 2.08,3.03in x,y directions,respectively.
【Keywords】 nonlinear optics; optical parametric oscillator; 2 μm laser; KTP crystal;
(Translated by LIU T)
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