A proposed approach for detecting terahertz pulses by using double few-cycle laser pulses with opposite carrier envelope phases

Kejia Wang; Xinyang Gu; Zhenwei Zhang; Zhengang Yang; Jinsong Liu; Shenglie Wang

doi:10.3788/COL201816.090401

Journals >Chinese Optics Letters >Volume 16 >Issue 9 >Page 090401 > Article

Chinese Optics Letters
Vol. 16, Issue 9, 090401 (2018)

A proposed approach for detecting terahertz pulses by using double few-cycle laser pulses with opposite carrier envelope phases

Kejia Wang^1、2, Xinyang Gu¹, Zhenwei Zhang², Zhengang Yang¹, Jinsong Liu^1、*, and Shenglie Wang^1、**

Author Affiliations

¹Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China

²Beijing Advanced Innovation Center for Imaging Technology and Key Laboratory of Terahertz Optoelectronics (MoE), Department of Physics, Capital Normal University, Beijing 100048, China

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DOI: 10.3788/COL201816.090401 Cite this Article Set citation alerts

Kejia Wang, Xinyang Gu, Zhenwei Zhang, Zhengang Yang, Jinsong Liu, Shenglie Wang. A proposed approach for detecting terahertz pulses by using double few-cycle laser pulses with opposite carrier envelope phases[J]. Chinese Optics Letters, 2018, 16(9): 090401 Copy Citation Text

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(a) The calculated SH intensity without the THz field I2ω0ω0 as the function of the time interval Δt and the laser pulse ϕCEP when W=30 μJ; (b) the SH intensity with the THz field I2ω0ω0+T versus the CEP and Δt; (c) the increment of SH intensities due to the THz signals I2ω0T; (d) the detected THz signals for different values of CEP; (e) the peak and valley values of the detected THz waveforms versus few-cycle lasers’ CEP.

Fig. 1. (a) The calculated SH intensity without the THz field I2ω0ω0 as the function of the time interval Δt and the laser pulse ϕCEP when W=30 μJ; (b) the SH intensity with the THz field I2ω0ω0+T versus the CEP and Δt; (c) the increment of SH intensities due to the THz signals I2ω0T; (d) the detected THz signals for different values of CEP; (e) the peak and valley values of the detected THz waveforms versus few-cycle lasers’ CEP.

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(a) Dependence of SH signal intensity on the THz pulse peak field with probe pulses of some special CEP points relative to the optimum one. (b) The subtraction results of the curves in (a).

Fig. 2. (a) Dependence of SH signal intensity on the THz pulse peak field with probe pulses of some special CEP points relative to the optimum one. (b) The subtraction results of the curves in (a).

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Fig. 3. (a) The THz SH signal waveforms detected by probe pulses when the amount of fluctuations is 1% of ϕCEPOPT; (b) the difference signal waveform and the original THz waveform; (c) the THz spectrum from the Fourier transform of the THz waveforms in (b); (d) the THz SH signal waveforms detected by the probe pulses when the amount of fluctuations is 5% of ϕCEPOPT; (e) the difference signal waveform and the original THz waveform; (f) the THz spectrum from the Fourier transform of THz waveforms in (e).

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Fig. 4. Proposed experimental scheme for the coherent detection of a THz pulse via using two few-cycle laser pulses.

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