基于自级联光参量振荡技术的2.7微米波段激光特性及器件研究

项目名称： 基于自级联光参量振荡技术的2.7微米波段激光特性及器件研究

项目编号： No.61505147

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 段延敏

作者单位： 温州大学

项目金额： 20万元

中文摘要： 2.7微米波段激光在激光医疗、激光生物工程、气体遥感探测和光电对抗等民用和国防高技术领域具有重要的应用前景。目前不同方法获得的该波段激光光源均有其局限性。本项目提出了通过自级联光参量振荡（OPO）技术来实现2.7微米波段激光输出。以最成熟的掺钕离子激光晶体与单块非临界相位匹配切割的KTiOAsO4非线性光学晶体组合为研究对象，通过合理的谐振腔结构及膜系设计，将OPO产生的信号光封闭在腔内，以OPO腔内高功率密度的信号光泵浦同一块KTA晶体实现高效的二次OPO转换。利用复合腔模式失配补偿、低热高效泵浦设计等技术，研究自级联OPO激光特性及关键科学问题。研发获得低阈值、高效率、结构紧凑并具有自主知识产权的新型2.7微米波段中红外激光器，预期获得3W以上高重频脉冲激光输出。项目研究成果对阐明自级联OPO运转机制，实现高效的2.7微米波段激光输出具有重要意义。

中文关键词： 光参量振荡器；非线性频率变换；；中红外激光器；

英文摘要： 2.7μm waveband laser have important application value in civilian, national defense and high-tech areas as laser medical treatment, laser bio-engineering, remote sensing and electro-optical countering. Recently, the laser source obtained by the different methods has its limitation. This project proposes a new self-cascaded optical parametric oscillation (OPO) laser using neodymium-doped laser crystal and single non-critical phase matching cut KTiOAsO4 crystal to obtain 2.7μm waveband laser. Cavity structure and film were reasonably designed to ensure that the signal light generated by the first OPO process was closed in OPO cavity. The signal light with high power intensity was adopted to pump the same KTA crystal to achieve efficient second OPO conversion. The compensation technique of mode mismatch for both fundamental and OPO cavities, as well as the high efficient pump technique with low thermal effect will be adopted to study the laser characteristics and key problems of self-cascaded OPO. A pulsed 2.7μm mid-infrared laser with low-threshold, high efficiency, compact structure and independent intellectual property rights will be developed, with the output power exceeded 3W. The research results are of great significance in clarifying the cascade OPO operation mechanism and developing efficient 2.7μm waveband laser output.

英文关键词： Optical parametric oscillator;Nonlinear optical frequency conversion technology;Mid-infrared laser