Research Of Continuous Wave And Femtosecond Optical Parametric Oscillator

Expanding the wavelength of laser sources to fit different requirements is always one ofthe most important work in laser research. Optical parametric oscillator (OPO) is apromising technology for its wavelength expanding ability and tunability. Especilly,expending the wavelength and tunability of the femtosecond leaser sources is alwaysone of the most challenging jobs of femtosecond laser research. In this thesis, we willintroduce our works in continuous wave OPO and femtosecond OPO. The maininnovation can be summarized as follows:①、Because the1.5μm laser source has important application in laser medicine, laserranging, optical communication and et. al. we designed and realized a continuous waveOPO that can deliver a wavelength tunable around1.5um.②、 For the needs of femtosecond OPO, we designed a high powerKell-lens-mode-locked femtosecond Ti:Sapphire oscillator that can deliver an averageoutput power of2.8W laser source with pulse width of117fs. The output wavelengthcan be tuned from780to820nm with a repetition rate of72MHz. This laser sourcewill be used as the pump source of the femtosecond OPO.③、Use the femtosecond Ti:Sapphire oscillator described above as the pump source, wedesigned a high power femtosecond OPO with dual-wavelength operation. Throughcarefully theory analysis, we explained the dual-wavelength operation and renewed theoriginal law. Under2.6W pump power, output power as high as530mW was gained.Through cavity length tuning, the signal wavelength can be tuned from1001to1438nm.④、Based on the above experiments, we realized femtosecond OPO in the visible byusing appropriate frequency doubling crystal. Through intracavity frequency doubling,femtosecond laser source tunable from624to673nm was gained, with a highest outputpower of260mW.