학술논문
High-sensitive multi-stage terahertz wave parametric up-conversion detection based on KTiOPO4 crystal
Document Type
Conference
Author
Source
2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz) Infrared, Millimeter and Terahertz Waves (IRMMW-THz),2022 47th International Conference on. :1-2 Aug, 2022
Subject
Language
ISSN
2162-2035
Abstract
A highly sensitive multi-stage terahertz (THz) wave parametric up-conversion detector based on KTiOPO 4 (KTP) crystal pumped by 1064nm laser (10 ns, 10Hz) was demonstrated in this paper. The up-conversion signal was amplified in two KTP crystals based on non-collinear and collinear phase matching respectively to improve detection sensitivity. The detectable THz frequency range was 4.30-4.47 THz and 4.81-4.95 THz. The minimum detectable energy of 244pJ was realized with dynamic range of 36dB at 4.45THz, which was an order of magnitude higher than that of commercial Golay cell. Compared with LiNbO 3 crystal, the parametric up-conversion detection based on KTP crystal can realize high frequency range (>3 THz) THz wave detection.