激光与光电子学进展, 2020, 57 (21): 210001, 网络出版: 2020-11-09   

多晶材料随机准相位匹配研究进展 下载: 1524次封面文章

Research Progress on Random Quasi-Phase Matching in Polycrystalline Materials
刘科飞 1,2钟凯 1,2,*姚建铨 1,2
作者单位
1 天津大学精密仪器与光电子工程学院激光与光电子研究所, 天津 300072
2 天津大学光电信息技术教育部重点实验室, 天津 300072
摘要
由非线性晶体颗粒烧结成的多晶材料在宏观上是各向同性的,但由于各晶粒取向的随机分布,激光与其发生作用时产生的非线性极化存在相干增强的可能,且非线性转换效率统计均值与互作用长度存在线性关系,这被称作随机准相位匹配(RQPM)。与双折射相位匹配(BPM)及准相位匹配(QPM)相比, 多晶材料的RQPM在带宽方面具有明显优势,因此多晶材料在宽带飞秒激光的频率变换中具有重要意义。近年来,基于多晶材料RQPM的差频(DFG)、倍频(SHG)及高效率光参量振荡器(OPO)等相继诞生,为实现超连续谱及宽带光频梳提供了一种低成本的新选择。对RQPM技术与理论的发展过程及研究现状进行了综述,对超宽带RQPM频率变换的最新重要成果进行了讨论,介绍了多晶陶瓷处理及建模的基本方法,并展望了RQPM发展前景,以期能够为国内超快激光及非线性光学频率变换等领域的研究提供参考。
Abstract
Although polycrystalline materials sintered from nonlinear crystal grains are macroscopically isotropic, the random distribution of grain orientation makes it possible that coherent enhancement of nonlinear polarization occurs when laser interacts with them. Meanwhile, the statistical average value of nonlinear conversion efficiency is proportional to the interaction length. Thus it is called random quasi-phase matching (RQPM). RQPM in polycrystalline materials has a distinct advantage in bandwidth over birefringence phase matching (BPM) and quasi-phase matching (QPM), thus polycrystalline materials are of great significance in frequency conversion for broadband femtosecond lasers. Recently, difference frequency generation (DFG), second harmonic generation (SHG), efficient optical parametric oscillation (OPO), and so on, have been realized based on RQPM in polycrystalline materials, which offers a new low-cost option for supercontinuum and broadband optical frequency combs. This paper summarizes the history and status of the technology and theories of RQPM, discusses the latest achievements on ultra-broadband frequency conversion, introduces the processing and modelling methods of polycrystalline materials, and gives an outlook on the development of RQPM. It is expected that this review can give references to domestic researchers in the fields of ultrafast lasers, nonlinear frequency conversion, etc.

刘科飞, 钟凯, 姚建铨. 多晶材料随机准相位匹配研究进展[J]. 激光与光电子学进展, 2020, 57(21): 210001. Liu Kefei, Zhong Kai, Yao Jianquan. Research Progress on Random Quasi-Phase Matching in Polycrystalline Materials[J]. Laser & Optoelectronics Progress, 2020, 57(21): 210001.

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