College of Physics and Electronic Information Engineering,Wenzhou University,Wenzhou 325035,China; 2.Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China;
This paper reports a continuous-wave 3.5 m mid-infrared laser based on LD end-pumped Nd:YLF/KTA intra-cavity optical parametric oscillator (OPO). A non-critical phase matching cut KTA crystal with 5 mm5 mm20 mm in size was adopted as the nonlinear optics crystal. A singly resonant oscillator with high reflectivity at signal light was designed to improve the power intensity of the signal light in the OPO cavity and reduce the threshold. The maximum output powers of 335 mW at 3440 nm and 110 mW at 1505 nm were obtained at the pump power of 8.35 W. The total conversion efficiency of 5.6% was achieved with respect to the same incident diode pump power. The results show that continuous-wave KTA-OPO derived by LD pumped solid laser also can produce efficient mid-infrared light.
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