Hot Paper - 0.35% THz pulse conversion efficiency achieved by Ti:sapphire femtosecond laser filamentation in argon at 1 kHz repetition rate

0.35% THz pulse conversion efficiency achieved by Ti:sapphire femtosecond laser filamentation in argon at 1 kHz repetition rate

Ti：蓝宝石飞秒激光在氩气中以 1 kHz 重复率实现 0.35% THz 脉冲转换效率
0.35% THz パルス変換効率は、1 kHz の繰り返し率でのアルゴン中の Ti:sapphire フェムト秒レーザーフィラメント化によって達成されました
1kHz 반복 속도로 아르곤에서 Ti:sapphire femtosecond laser filamentation을 통해 0.35% THz 펄스 변환 효율 달성
Eficiencia de conversión de pulsos de 0,35 % THz lograda por filamentación láser de femtosegundos de Ti:zafiro en argón a una tasa de repetición de 1 kHz
Efficacité de conversion d'impulsions de 0,35 % THz obtenue par filamentation laser femtoseconde Ti: saphir dans de l'argon à une fréquence de répétition de 1 kHz
Эффективность преобразования терагерцового импульса 0,35% достигается за счет филаментации фемтосекундного лазера на Ti:сапфире в аргоне с частотой повторения 1 кГц

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

https://doi.org/10.29026/oea.2022.210065

https://www.oejournal.org/article/doi/10.29026/oea.2022.210065

Opto-Electronic Advances, 27 July 2022

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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