【作者】 王睿；

【导师】 丁欣；

【作者基本信息】 天津大学 ， 光电子技术， 2008， 硕士

【摘要】 1.4μm～1.6μm近红外波在医疗、远距离遥感、空间通信、多普勒雷达以及工业、农业和食品行业的光谱分析与检测等方面有着广泛的应用。近年来,随着非线性晶体PPLN等的成熟及泵浦源的改进,利用光学参量振荡器(OPO)中的非线性频率变换技术获得1.4μm～1.6μm近红外光源引起了专家们的极大兴趣。另外,光谱范围在580nm~620nm波段的黄橙光光源在光谱研究、生命科学、医药科学、材料科学、分子动力学、天文学等方面具有重要应用。目前,该波段的全固态激光光源主要是利用频率变换技术,通过倍频、和频、受激拉曼频移的方法来获得。本论文主要设计并研制了连续运转的1.4μm～1.5μm可调谐近红外光源和连续运转的604nm~624nm可调谐黄橙光光源。主要内容和创新点归纳如下:1.在分析了多模泵浦的内腔单谐振光学参量振荡器(ICSRO)的动力学模型的基础上,对信号光输出功率特性提出了优化方案,为实现高功率、高效率连续波输出的近红外内腔OPO奠定了动力学理论基础。2.为实现高效率、高光束质量、稳定的近红外内腔OPO连续运转,利用光学谐振腔的图解分析与设计方法对整个ICSRO进行了详细的热稳腔设计;同时为获得调谐输出,详细计算了PPLN晶体的调谐曲线。3.对连续运转的近红外ICSRO进行了实验研究,以LD端面泵浦的Nd:YVO4激光器作为泵浦源,多周期的PPLN置于腔内,国内首次实现高效率连续波ICSRO信号光输出,调谐范围为1402nm~1513nm,其中在波长1500nm处获得最大功率为820mW,最大的光光转换效率为7.51%。4.在和频理论的基础上,运用角度相位匹配原理,通过详细的计算,选出满足和频实验需求的最佳非线性晶体及其具体参数。5.以ICSRO为基础设计了两种不同实验方案,对利用其泵浦光与信号光腔内和频,产生连续波、可调谐黄橙光输出进行实验研究,并已经利用第一种方案获得604nm~624nm连续波、可调谐黄橙光输出,其中在624nm处获得了最大输出功率为120mW的黄橙光输出,光光转换效率为1.1%。更多还原

【Abstract】 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.更多还原