Mr. Changhao Hu Profile

Changhao Hu

at Tianjin Univ

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Proceedings Article | 16 December 2022 Presentation + Paper

High sensitivity terahertz parametric up-conversion detector based on KTP crystal

Changhao Hu, Yuye Wang, Kai Chen, Chao Yan, Degang Xu, Yuma Takida, Hiroaki Minamide, Jianquan Yao

Proceedings Volume 12324, 1232405 (2022) https://doi.org/10.1117/12.2641415

KEYWORDS: Terahertz radiation, Ferroelectric materials, Crystals, Signal detection, Sensors, Phase matching, Terahertz detection

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A highly sensitive terahertz parametric up-conversion detector based on KTiOPO₄(KTP) crystal pumped by 1064nm laser was demonstrated in this paper. THz wave was generated in KTP crystal with a terahertz parametric oscillator (TPO), which can generate THz wave from 1.17-5.98 THz by varying the phase-matching angle between the pump and Stokes wave inside KTP crystal. THz wave and pump wave were mixed in KTP crystal to generate up-conversion signal based on stimulated parametric scattering. The up-conversion signal was amplified in another two KTP crystals based on non-collinear and collinear phase matching to improve detection sensitivity. Spectrometer and photodiode were used to measure the wavelength and pulse energy of up-conversion signal respectively. The detectable THz frequency range was 4.26-4.50 THz and 4.80-4.92 THz. The minimum detectable energy of 250 pJ was realized with dynamic range of 32 dB at 4.40 THz, and the minimum detectable energy at 4.85 THz was 9.4 pJ with dynamic range of 48 dB. All experiments were carried out under pump threshold conditions of spontaneous parametric noise generation. Compared with LiNbO₃ crystal, the parametric up-conversion detection based on KTP crystal can realize high frequency range (>3 THz) THz wave detection, filling in the gaps for high-frequency detection.

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