(Peer-Reviewed) 0.35% THz pulse conversion efficiency achieved by Ti:sapphire femtosecond laser filamentation in argon at 1 kHz repetition rate
Zhiqiang Yu 余志强 ¹ ², Nan Zhang 张楠 ¹ ², Jianxin Wang 王建鑫 ¹ ², Zijie Dai 戴子杰 ¹ ², Cheng Gong 龚诚 ¹ ², Lie Lin 林列 ¹ ³, Lanjun Guo 郭兰军 ¹ ², Weiwei Liu 刘伟伟 ¹ ²
¹ Institute of Modern Optics, Nankai University, Tianjin 300350, China
中国 天津 南开大学现代光学研究所
² Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology, Tianjin 300350, China
中国 天津 天津市微尺度光学信息技术科学重点实验室
³ Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Tianjin 300350, China
中国 天津 天津市光电传感器与传感网络技术重点实验室
Opto-Electronic Advances
, 2022-07-27
Abstract
In this study, an optical setup for generating terahertz (THz) pulses through a two-color femtosecond laser filament was carefully designed to achieve a precise overlap of two-color laser pulses in space and time. β-barium borate (BBO), α-BBO, and a dual-wavelength plate were used to compensate the phase delay of the two-color lasers.
Tilting of α-BBO could further realize the precise spatial overlap of the two beams by counteracting the walk-off effect. The maximum output THz pulse energy reached 21 μJ in argon gas when using a commercial Ti:sapphire laser with a pulse energy of 6 mJ at a 1 kHz repetition rate. The corresponding conversion efficiency exceeded 0.35%.
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