摘要
We theoretically analyze the generation of broadened and multi-peak terahertz （THz） radiation in aperiodically poled lithium niobate （APPLN）, whose sequence of opposite domains is optimized by simulated annealing （SA） algorithm. The full-width at half maximum （FWHM） of the broadened THz radiation in our simulation is 0.26 THz. Both of the central wavelength and FWHM can be easily tuned by choosing proper objective functions. THz radiation with wider and flatter FWHM can be achieved by increasing the length of the lithium niobate crystal. The two-peak THz generation is also provided as an example of multi-peak with the central wavelengths at 1.68 and 1.80 THz, respectively.
We theoretically analyze the generation of broadened and multi-peak terahertz （THz） radiation in aperiodically poled lithium niobate （APPLN）, whose sequence of opposite domains is optimized by simulated annealing （SA） algorithm. The full-width at half maximum （FWHM） of the broadened THz radiation in our simulation is 0.26 THz. Both of the central wavelength and FWHM can be easily tuned by choosing proper objective functions. THz radiation with wider and flatter FWHM can be achieved by increasing the length of the lithium niobate crystal. The two-peak THz generation is also provided as an example of multi-peak with the central wavelengths at 1.68 and 1.80 THz, respectively.
基金
This work was supported by the National Natu- ral Science Foundation of China (No. 60477016), theFoundation for Development of Science and Technol- ogy of Shanghai (No. 02DJ14001 and 04DZ14001), and the "Shu-Guang" Scholar Plan of Shanghai Education Committee.
