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Study On The Quasi-phase-matching Optical Parametric Oscillator Based On PPMgLN

Posted on:2011-03-16Degree:DoctorType:Dissertation
Country:ChinaCandidate:H Y LinFull Text:PDF
GTID:1118360305990359Subject:Optics
Abstract/Summary:PDF Full Text Request
In recent years, the mid-infrared laser source gained much attention. There are several methods (quantum cascade lasers, free electron laser, chemical laser, overtone CO laser, etc.) available mid-infrared laser output, which were less competitive. As the high-power laser diode pumped optical parametric oscillator with all the characteristics of all solid-state lasers, the literature generally agreed that all solid-state optical parametric oscillator is the most promising mid-infrared laser source. Solid-state optical parametric oscillator widely used in optoelectronic countermeasures, laser radar, spectrum analysis, quantum optics, THz field generation, and laser display systems.Using the quasi-phase-matched periodically poled MgO-doped lithium niobate crystal (PPMgLN) as the nonlinear converter, we have accomplished low threshold and highly efficient CW and pulsed (including passive Q-switch and active Q-switch) optical parametric oscillators (OPO), driven by compact and efficient diode-end-pumped CW and pulsed Nd:YVO4 lasers. Furthermore, by shifting the PPMgLN crystal, the periods of the domain structure on the PPMgLN wafer can be changed, thus enabling a mid-infrared widely tunable spectral range and an eye-safe widely tunable range.1. Theory Study. We introduced the fundamental theory on OPO system; discussed quasi-phase-matching technique of periodically poled crystal and properties of PPMgLN crystal; analyzed the characteristics of extra-cavity OPO and intra-cavity OPO; and studied the parasitic oscillation of the PPMgLN crystal.2. Experiment Study. Experiment study mainly included three aspects: (1) We use a CW laser as the pump source and obtain a Nd:YVO4 / PPMgLN extra-cavity optical parametric oscillator. CW mid-infrared laser output power have reached the W-class. (2) We also obtained a pulsed PPMgLN extra-cavity optical parametric oscillator based on a pulsed Nd:YVO4, and won > 1 W mid-infrad output power. (3) We achieved a CW intra-cavity singly resonant OPO based on PPMgLN crystal.At the same time, we completed the OPO experiment of period tuning, by changing the periods of the domain structure on the PPMgLN wafer. Using the PPMgLN with 7 periods in 28.5 - 31.5μm, we enabled a widely tunable mid-infrared spectrum of 2.95 - 4.16μm, and signal wavelengths widely tunable in range of 1.43 - 1.66μm. Using the PPMgLN with 20 periods in 27.6 - 31.4μm, we gived a widely tunable mid-infrared spectrum of 3.03 - 4.49μm, and signal wavelengths widely tunable in range of 1.40 - 1.64μm.The studying work and the obtained results in this research would be an important reference to engineering for the development of the mid-infrared optical parametric oscillators, product development and their applications in China.
Keywords/Search Tags:quasi-phase-matching, PPMgLN, mid-infrared spectrum, CW and pulsed laser, optical parametric oscillator, tunable laser
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