双波长陶瓷激光抽运磷化镓差频产生太赫兹波的理论研究  

Theoretical Investigation of Terahertz Generation in GaP via Difference Frequency Pumped by Dual-wavelength Ceramic Laser

作　　者：吕健滔[1] 王可嘉[2] 陈国杰[1] 

机构地区：[1]佛山科学技术学院理学院,广东佛山528000 [2]华中科技大学光学与电子信息学院,武汉光电国家实验室,湖北武汉430074

出　　处：《激光与光电子学进展》2015年第6期235-240,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61178030)

摘　　要：基于差频产生太赫兹的平面波近似理论,研究了陶瓷双波长激光抽运磷化镓产生太赫兹波的相位匹配特性、功率特性以及温度特性。结果表明,对于波长为1060 nm附近的抽运光,可以采取共线匹配的方式获得较大的相干长度并满足产生高功率太赫兹辐射的要求。太赫兹辐射功率与磷化镓晶体的长度有关,对于某个特定波长的太赫兹辐射存在一个最佳的晶体长度。通过改变磷化镓晶体的温度可以调整差频过程的相位匹配效果,进而获得不同的相位匹配波长范围。数值模拟结果为陶瓷双波长激光抽运磷化镓产生太赫兹实验提供理论依据。Based on the plane wave approximate theory for terahertz generation via difference frequencies, the characteristics of terahertz wave generated in GaP pumped by dual-wavelength ceramic laser is investigated, including the phase matching, output power and temperature behavior. Results show that the coherent length is large enough via collinear matching method by use of the pumping light near 1060 nm. The output power of the terahertz emission relates to the crystal length and there is an optimal value for specific terahertz wavelength. The phase matching effect can be adjusted via changing the temperature of the GaP crystal, so different phase matching wavelength ranges can be obtained. The simulation result can provide some guidance for terahertz generation in GaP via difference frequency pumped by dual-wavelength ceramic laser.

关 键 词：非线性光学 太赫兹 差频 双波长陶瓷激光 

分 类 号：O437[机械工程—光学工程]