Experimental Research On Continuous-wave Intracavity Near Infrared PPLN Optical Parameter Oscillator And Yellow-orange Light Source

There are many applications of 1.4μm～1.6μm near-infrared laser including medical treatment, instance remote sensing, optical spacial communication, Doppler lidar systems and spectral analysis or detection in industry, agriculture and foodstuff. Recently, achieving 1.4μm～1.6μm laser source by using the technology of nonlinear frequency conversion in optical parameter oscillator (OPO) has attracted many experts'attention, with the development of the nonlinear crystal, such as PPLN crystal, and the pumping source. In addition, the yellow-orange laser in the spectral range of 580nm~620nm has many important applications in spectral analysis, life science, medicine, material science, molecular dynamics and astronomy. Presently, an all-solid-state laser in this spectral range was obtained by frequency conversion, such as frequency-doubling, sum frequency, stimulated or Raman frequency-shifted.This dissertation is based on the experimental research of continuous-wave(CW), tunable 1.4μm～1.6μm near-infrared laser source and CW tunable 604nm~624nm yellow-orange laser. The main contents and key creation points are as follows:1. Based on the analysis of the dynamics model of multi-modes pumped intracavity singly resonant optical parametric oscillator (ICSRO), the power characteristic of signal output was optimized by numerically analyzing, which offered the theoretical basis for high power, high efficiency CW output of near infrared intracavity OPO.2. For high efficiency, high beam quality, stable operation of near infrared intracavity OPO, the whole ICSRO was designed in detail as a thermal-insensitive resonator by graphic anglicizing and designing of optical resonator; to obtain tunable output, the turning curve of PPLN crystal was carefully calculated.3. The CW near infrared ICSRO was experimental researched. Pumped by a LD pumping Nd:YVO4 laser, with a multi-periodic PPLN in the cavity, a high efficient CW ICSRO operation with tunable signal output in the range of 1402nm~1513nm was first achieved in the nation, including the maximum output power of 820mW and the maximum optical-to optical conversion efficiency of 7.51% at 1500nm.4. Based on the theory of angle phase matching and frequency mixing, through carefully calculation, the optimum nonlinear crystal including its parameters was chose, which satisfied the needs of sum-frequency experiment.5. Based on the ICSRO, by using the intracavity sum-frequency mixing of the pump laser and the signal laser, two different experimental schemes were designed for the experimental research of CW tunable yellow-orange output. 604nm~624nm CW tunable yellow-orange laser was obtained in the first scheme, including the maximum output power of 120mW and the maximum optical-to optical conversion efficiency of 1.1% at 624nm.