3-5 μm超快光参量振荡器群速度匹配及调控技术的研究

项目名称： 3-5 μm超快光参量振荡器群速度匹配及调控技术的研究

项目编号： No.61505113

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： 钟亥哲

作者单位： 深圳大学

项目金额： 21万元

中文摘要： 光参量振荡（OPO）是产生中红外超短脉冲激光，特别是中红外“光频梳”的较为有效的方法。本申请项目拟采用满足I类（或II类）相位匹配的准相位匹配技术，利用群速度与温度间的色散关系，通过控制周期极化晶体的工作温度，调控信号光、闲频光以及泵浦光三者间的群速度关系，甚至完全消除不同作用光之间的群速度失配（GVM），从根本上解决中红外飞秒OPO中由于近红外与中红外波长的高度不简并而更加突出的GVM，以及由此造成的转换效率受限、增益带宽窄化等问题。具体的，以3-5 μm的典型中红外波长为主要研究对象，探索实现“群速度匹配”中红外飞秒OPO的物理机制和技术途径，完成相关的理论设计和实验验证，掌握其时空特性、频谱特性随运转参数变化的基本规律和控制方法，在此基础上，开展将上述技术方案与多周期极化晶体（APPLN）相结合的探索研究。形成适用于中红外光参量过程的实用技术。

中文关键词： 光学参量振荡器；；中红外激光技术；；超快激光技术；准相位匹配；群速度匹配

英文摘要： Optical-Parametric-Oscillation (OPO) is so far a significant means of generating mid-infrared ultra-short laser sources and optical frequency combs. This project plans to adopt the quasi-phase-matching technology which meets the type-I or type-II phase matching condition. Via appropriate temperature control of the periodically poled crystal, utilizing the relationship between temperature and dispersion, the group velocities of pump, signal and idler can be tailed purposefully to some extent and the Group Velocity Mismatch (GVM) between different interaction waves to be completely removed so that the subsequently induced conversion efficiency limited and gain-bandwidth narrowing problems will be solved essentially. In mid-infrared OPOs, the GVM would be increasingly obvious due to the considerably distinct between the near- and mid-infrared wavelengths. Specifically, with the typical mid-infrared wavelength between 3-5 μm as the major object of the research, the physical mechanism and technological ways of realizing mid-infrared OPO in group-velocity-matching will be explored and implemented. With the relevant theoretical design and experimental verification completed, master the basic laws and control methods where its space-time characteristics and spectrum characteristics change over operating parameters. On this basis, exploration of the potential applications of proposed technical scheme combining the apodized aperiodically MgO:LiNbO3 (APPLN) will be implemented. Forming the practical technology applied to the mid-infrared optical parametric process.

英文关键词： Optical parametric oscillator;Mid-infrared laser ;Ultrafast laser technology;Quasi phase matching;Group velocity matching