利用差頻效應在硒化鎵晶體中產生連續可調之兆赫輻射技術及其應用

Tunable Terahertz-Radiation by Difference Frequency Generation in GaSe Crystal

徐裕奎(Yu-Kuei Hsu) ； 陳晉瑋(Ching-Wei Chen) ； 張振雄(Chen-Shiung Chang) ； 潘犀靈(Ci-Ling Pan)

《科儀新知》 147期 (2005/08) Pp. 9-15

https://doi.org/10.29662/IT.200508.0001

摘要

超快雷射技術的迅速發展，以及非線性光學晶體成長技術的成熟，極快地促進了非線性光學轉換頻率技術的成熟，更拓展了兆赫輻射的研究和應用技術的發展。利用硒化鎵晶體在兆赫輻射的低吸收係數以及相當大的二階非線性係數，藉由非線性光學差頻技術可以產生具同調性且連續可調波長的兆赫輻射光源。除此之外，在本文也介紹此差頻技術所產生光源之基本特性以及相關的應用。

並列摘要

Recent developments in nonlinear optical materials and laser technology have led to the development of terahertz radiation sources based on nonlinear optical technique. Based on phase-matched collinear different-frequency generation in a single GaSe crystal, coherent terahertz radiation sources can be efficiently generated and tuned in extremely wide ranges. This is due to the fact that GaSe has the lowest absorption coefficient and large nonlinear optical coefficient. Moreover, the characteristics and applications of coherent terahertz radiation sources will be introduced in this paper.