Research On Intra-Cavity Optical Parametric Oscillators Based On A Fundamental-Mode Diode Laser And A Yb:KYW Crystal

Optical parametric oscillators(OPOs)represent an important technical route for generating mid-infrared coherent light.In this thesis,we investigated an intra-cavity singly-resonant OPO(ICSRO)based on a Yb: KYW laser and a MgO:PPLN nonlinear crystal.We also studied the dynamics of a Yb:KYW laser and an ICSRO by numerical simulation,and analyzed the influence of intra-cavity nonlinear loss on relaxation oscillations.The main content is as follows:1.The dynamics of a Yb:KYW laser and an ICSRO were simulated by numerical analysis.Also,The influence of nonlinear loss on relaxation oscillations of the Yb:KYW laser and the ICSRO were investigated,which indicated that the existence of nonlinear loss can eliminate relaxation oscillations effectively.2.A Yb:KYW laser pumped by a fundamental-mode diode laser was designed,with low pump noise and quantum defect.Its output power characteristics,spectra and relaxation oscillations were measured.3.An ICSRO based on that Yb:KYW laser and a PPLN crystal was constructed,and its threshold,output power characteristics,spectra and beam profiles were measured.Its relaxation oscillations and steady-state power stability were measured in detail,showing good power stability.