Tunable and coherent terahertz source based on CdSiP2 crystal via collinear difference frequency generation

Author:

Li Yang12ORCID,Huang Jingguo1,Huang Zhiming12,Zhang Guodong3,Gao Yanqing1,Shi Yi4

Affiliation:

1. Shanghai Institute of Technical Physics CAS

2. University of Chinese Academy of Sciences

3. Shandong University

4. Donghua University

Abstract

CdSiP2 (CSP) crystals have attracted increasing attention as efficient optical conversion media. Herein, the optical properties of a CSP crystal grown with the vertical Bridgman method are measured by a terahertz time-domain spectrometer (THz-TDS) at 0.2–3 THz. For the first time, to the best of our knowledge, the broadband, tunable, coherent, monochromatic THz radiation from 0.08 to 1.68 THz (3775–178 µm) is generated experimentally via this crystal, which is pumped by a nanosecond Q-switched Nd:YAG laser and an optical parametric oscillator (OPO) and based on difference frequency generation (DFG) technology. The output power and its corresponding conversion efficiency at 0.74 THz are 26.6 mW and 1.4 × 10−7, respectively. Our work demonstrates that the CSP crystal is a potential efficient terahertz DFG candidate for out-of-door applications.

Funder

National Science Fund for Distinguished Young Scholars

Chinese Academy of Sciences

Sino-Russia International Joint Laboratory of Terahertz Materials and Devices

Shanghai Municipal Science and Technology Major Project

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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