基于MgO∶CLN晶体的脉冲种子注入式太赫兹波参量产生源  

Injection Pulse-Seeded Terahertz-Wave Parametric Generator Based on MgO∶CLN Crystal

作　　者：徐德刚[1,2] 闫超[1,2] 聂港[1,2] 唐隆煌 陈锴 王与烨 姚建铨[1,2] Degang Xu;Chao Yan;Gang Nie;Longhuang Tang;Kai Chen;Yuye Wang;Jianquan Yao(Institute of Laser and Optoelectronics,School of Precision Instruments and Opto-Electronics Engineering,Tianjin University,Tianjin 300072,China;Key Laboratory of Opto-Electronic Information Technology(Tianjin University),Ministry of Education,Tianjin 300072,China)

机构地区：[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]教育部光电信息技术科学重点实验室,天津300072

出　　处：《光学学报》2020年第15期120-125,共6页Acta Optica Sinica

基　　金：国家自然科学基金(61775160,U1837202,61771332)。

摘　　要：同成分铌酸锂(CLN)晶体是最常用的太赫兹参量增益晶体,基于该晶体的太赫兹波参量辐射源具有太赫兹波输出能量高、连续可调谐等优点,但是其调谐范围相对较窄,一般为0.6~3 THz,限制了其实际应用范围。为此,提出基于摩尔分数为5%的氧化镁掺杂的CLN晶体的脉冲种子注入式太赫兹波参量产生器,其太赫兹波频率调谐范围为1~4 THz,在2.0 THz处获得最大输出能量为1.02μJ,输出太赫兹波的3 dB带宽达1.94 THz,占调谐范围的64.67%。该太赫兹辐射源具有宽频带、增益平坦等特性,在实际应用中具有更高的价值。Congruent lithium niobate(CLN)is the most commonly used terahertz parametric gain crystal.The terahertz-wave parametric source based on the CLN crystal has the advantages of high terahertz-wave output energy and continuous tunability,but its tuning range is relatively narrow,generally during 0.6-3 THz,which limits its practical applications.Therefore,an injection pulse-seeded terahertz-wave parametric generator based on 5%mol MgO∶CLN crystal is proposed.The terahertz-wave frequency tuning range is 1-4 THz,and the maximum output energy is 1.02μJ at 2.0 THz.The 3 dB bandwidth of the output terahertz wave is 1.94 THz,accounting for 64.67%of the tuning range.The terahertz radiation source has the characteristics of broadband and flat gain,and has higher value in practical applications.

关 键 词：非线性光学 太赫兹波 脉冲种子注入 太赫兹参量产生器 受激电磁耦子 

分 类 号：O437.3[机械工程—光学工程]