Recent developments in nonlinear optical materials and laser technology have led to the development of terahertz radiation sources based on nonlinear optical technique.

• 摘要超快雷射技术的迅速发展，以及非线性光学晶体成长技术的成熟，极快地促进了非线性光学转换频率技术的成熟，更拓展了兆赫辐射的研究和应用技术的发展。