QPM超连续谱激光光源的研究

项目名称： QPM超连续谱激光光源的研究

项目编号： No.11204128

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学I

项目作者： 赵刚

作者单位： 南京大学

项目金额： 30万元

中文摘要： 本课题是在 "863"研究成果和所形成的知识产权基础上，采用准相位匹配技术，通过光学参量振荡过程，实现高效全固态近、中红外（1.35-5 微米）超连续谱输出激光器。该激光器以掺镁化学计量比钽酸锂光学超晶格为非线性变频晶体，采用1064纳米激光器为泵浦光源，变频晶体设计为扇形周期结构，将泵浦光整形为扁平形截面，或直接使用板条激光器直接泵浦，利用扇形结构中的渐变周期实现从近红外到中红外的超连续谱同时输出。该方案充分利用了QPM超晶格材料横向宽度，又利用板条激光器输出光斑特点，可实现大功率红外输出；采用扇形周期结构可实现超连续谱输出。该方案克服了QPM调谐速度慢的缺点，最大限度利用了超晶格材料的截面积，具有大功率和超连续谱输出的优点，该激光器在线性和非线性光谱学研究、生物医学、共聚焦显微分析、高精密光学测量、大气环境监测等民用领域和空间激光对抗、宽谱光探测与激光雷达等军用领域具有广阔市场前景。

中文关键词： 超连续谱；超晶格；光参量；中红外；宽带

英文摘要： This project is based on our previous results supported by "863" project, aims to realize high efficient solid-state near/mid infrared (1.35-5 micro) super-continuous laser by adopting quasi-phase matching technique and optical parametric oscillations. This laser will be implemented by utilizing Mg-doped SLT as the nonlinear crystal with fan-shaped periodic domain structure, shaping the 1064nm pumping laser beam into a flat one, or directly taking usage of slab laser, to achieve the continuous laser output from near to middle IR with the aid of gradual periods of the fan-shaped domain. This scheme combines the advantageous of matched lateral width of OPM supperlattice and the required output beam shape, which is helpful to realize the high power and super-continuous spectrum of the output. This scheme further overcome the shortcoming of the low modulation speed of traditional QPM process, and maximizes the use of the cross-section area of the supperlattice. This laser suggests broad application potentials in both the civilian areas, such as the linear and nonlinear spectroscopy, biomedical, confocal microscopy, high-precision optical measurement, atmosphere detection, and the military area, such as spatial laser confrontation, broadband spectroscopy, and laser radar.

英文关键词： supercontinuum；superlattice；optical parametric；mid-infrared；broad-band