Study on mid-infrared laser PPMgLN optical parametric oscillators

In order to obtain 3.8μm laser output, it was demonstrated in optical parametric oscillator(OPO)with periodically poled lithium niobate crystals doped with magnesium oxide (mole fraction of MgO-doping is 0.05) pumped by 1.064μm laser. The relationship curve between output wavelength and polarization period and the temperature was calculated. When polarization period is 29.2μm and the temperature is 400K, 3.8μm laser output is achieved. When pump power is 35W at repetition rate of 8kHz, an average output power of 3.9W at 3.84μm is obtained with slope efficiency of 11.14%, and the M2 factor is 6.46. The results show that 3.8μm laser output can be obtained with high conversion efficiency, and it can be used as laser sources of infrared laser interference.