太赫兹科学与电子信息学报, 2018, 16 (1): 7, 网络出版: 2018-07-24
基于腔相位匹配差频产生太赫兹的研究
Terahertz generation by Difference Frequency Generation based on cavity phase matching
太赫兹源 差频 腔相位匹配 GaAs晶体 terahertz source difference frequency generation cavity phase matching GaAs crystal
摘要
研究了基于 GaAs晶体的腔相位匹配 (CPM)差频产生太赫兹的过程,得出太赫兹波长与最优腔长之间的关系,并结合温度对太赫兹波长的影响,可实现太赫兹波段范围内的连续调谐输出。当泵浦光在微腔中往返 20次时,腔相位匹配产生太赫兹的功率转换效率可达 1.33%,在效率相同的情况下, CPM腔长为 581.41 μm时相当于准相位匹配 (QPM)条件下的晶体长度约 23 mm。可以预见由腔相位匹配原理制备的太赫兹源将具有广阔的应用前景,该结果对相关实验具有一定的参考价值。
Abstract
The process of Terahertz(THz) generation by Difference Frequency Generation(DFG) based on Cavity Phase Matching(CPM) in a GaAs crystal is investigated. The relation between the terahertz wavelength and optimum cavity length is obtained. Combined with the influence of temperature on terahertz wavelength, the continuously tunable THz wave in terahertz frequency can be realized. The power conversion efficiency of terahertz generation based on cavity phase matching can reach to 1.33% under the condition that pump wave travels round trip for 20 times in the microcavity. 581.41 μm of the cavity length based on CPM amounts to 23 mm of crystal length based on Quasi-Phase Matching(QPM) at the same efficiency. It can be predicted that the terahertz sources prepared by cavity phase matching will have broad application prospect, and the results can provide certain reference for related experiments.
曾诗佳, 饶志明, 黄俊滔, 谢芳森. 基于腔相位匹配差频产生太赫兹的研究[J]. 太赫兹科学与电子信息学报, 2018, 16(1): 7. ZENG Shijia, RAO Zhiming, HUANG Juntao, XIE Fangsen. Terahertz generation by Difference Frequency Generation based on cavity phase matching[J]. Journal of terahertz science and electronic information technology, 2018, 16(1): 7.