Twin pulses of THz generation from a nonlinear crystalline quartz by femtosecond laser pulse

doi:10.1088/1674-1056/addbcd

中国物理B ›› 2025, Vol. 34 ›› Issue (9): 94211-094211.doi: 10.1088/1674-1056/addbcd

Twin pulses of THz generation from a nonlinear crystalline quartz by femtosecond laser pulse

Xiangmei Dong(董祥美)¹, Dan-Ni Li(李丹妮)¹, Zuan-Ming Jin(金钻明)^1,2,†, Hui-Ping Zhang(张慧萍)^1,2, Hong-Guang Li(李宏光)³, Shao-Hui Wu(吴少晖)⁴, Yan Peng(彭滟)^1,2, Yiming Zhu(朱亦鸣)^1,2, and Songlin Zhuang(庄松林)¹

1 Terahertz Technology Innovation Research Institute, Terahertz Spectrum and Imaging Technology Cooperative Innovation Center, Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China;
2 Shanghai Institute of Intelligent Science and Technology, Tongji University, Shanghai 200092, China;
3 Xi'an Institute of Applied Optics, Xi'an 710065, China;
4 AKM Meadville Technologies Co., Ltd., Guangzhou 510663, China

收稿日期:2025-04-15 修回日期:2025-05-15 接受日期:2025-05-22 出版日期:2025-08-21 发布日期:2025-08-28
通讯作者: Zuan-Ming Jin E-mail:physics_jzm@usst.edu.cn
基金资助:
crystalline quartz|terahertz emission|optical rectification effect|forced electromagnetic pulses

Twin pulses of THz generation from a nonlinear crystalline quartz by femtosecond laser pulse

1 Terahertz Technology Innovation Research Institute, Terahertz Spectrum and Imaging Technology Cooperative Innovation Center, Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China;
2 Shanghai Institute of Intelligent Science and Technology, Tongji University, Shanghai 200092, China;
3 Xi'an Institute of Applied Optics, Xi'an 710065, China;
4 AKM Meadville Technologies Co., Ltd., Guangzhou 510663, China

Received:2025-04-15 Revised:2025-05-15 Accepted:2025-05-22 Online:2025-08-21 Published:2025-08-28
Contact: Zuan-Ming Jin E-mail:physics_jzm@usst.edu.cn
Supported by:
Project supported by the National Key Research and Development Program of China (Grant No. 2023YFF0719200), the National Natural Science Foundation of China (Grant Nos. 62322115, U24A20226, 61988102, and 62435010), 111 Project (Grant No. D18014), Science and Technology Commission of Shanghai Municipality (Grant Nos. 22JC1400200 and 21S31907400).

摘要/Abstract

摘要： We observed sub-picosecond terahertz (THz) pulses generated from an electro-optic quartz plate using femtosecond optical pulses. The time-resolved THz radiation signal clearly indicates two separated THz pulses with opposite polarity. Based on our results, a model based on optical-to-THz conversion via optical rectification is proposed to describe the twin pulsed THz emission mechanism of the quartz plate. Firstly, the two separated THz pulses are assigned to the forced and free THz pulses, respectively. With an optical pulse serving as an external source in the crystalline quartz, the forced THz pulse is a solution to linear Maxwell's equations and propagates at the velocity of the pump laser pulse, while the free THz pulse propagates with the group velocity in the THz frequency range. Finally, as a non-centrosymmetry material, the THz amplitude exhibits perfect threefold symmetry with respect to the azimuthal angle and twofold symmetry with respect to the pump polarization angle.

关键词: crystalline quartz, terahertz emission, optical rectification effect, forced electromagnetic pulses

Abstract: We observed sub-picosecond terahertz (THz) pulses generated from an electro-optic quartz plate using femtosecond optical pulses. The time-resolved THz radiation signal clearly indicates two separated THz pulses with opposite polarity. Based on our results, a model based on optical-to-THz conversion via optical rectification is proposed to describe the twin pulsed THz emission mechanism of the quartz plate. Firstly, the two separated THz pulses are assigned to the forced and free THz pulses, respectively. With an optical pulse serving as an external source in the crystalline quartz, the forced THz pulse is a solution to linear Maxwell's equations and propagates at the velocity of the pump laser pulse, while the free THz pulse propagates with the group velocity in the THz frequency range. Finally, as a non-centrosymmetry material, the THz amplitude exhibits perfect threefold symmetry with respect to the azimuthal angle and twofold symmetry with respect to the pump polarization angle.

Key words: crystalline quartz, terahertz emission, optical rectification effect, forced electromagnetic pulses

中图分类号: (Frequency conversion; harmonic generation, including higher-order harmonic generation)

42.65.Ky

42.72.Ai (Infrared sources) 71.36.+c (Polaritons (including photon-phonon and photon-magnon interactions)) 42.65.Re (Ultrafast processes; optical pulse generation and pulse compression)

Xiangmei Dong(董祥美), Dan-Ni Li(李丹妮), Zuan-Ming Jin(金钻明), Hui-Ping Zhang(张慧萍), Hong-Guang Li(李宏光), Shao-Hui Wu(吴少晖), Yan Peng(彭滟), Yiming Zhu(朱亦鸣), and Songlin Zhuang(庄松林). Twin pulses of THz generation from a nonlinear crystalline quartz by femtosecond laser pulse[J]. 中国物理B, 2025, 34(9): 94211-094211.

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Twin pulses of THz generation from a nonlinear crystalline quartz by femtosecond laser pulse

Twin pulses of THz generation from a nonlinear crystalline quartz by femtosecond laser pulse

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