| Citation: | LI Ming-xing, WU Ze-peng, YU Jia-xin, HE Wen-jun, YOU Ya-jun, LIU Yi, CHOU Xiu-jian, ZHANG Le. Continuous fine-tunable terahertz radiation source based on L-band laser difference frequency[J]. Chinese Optics. doi: 10.37188/CO.2025-0149
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This paper presents a continuously fine-tunable terahertz radiation source based on L-band laser difference frequency generation, with a frequency tuning range of 0.1 to 2.7 THz and a tuning accuracy of 1 GHz. A fully polarization-maintaining fiber link, including polarization-maintaining isolators, polarization-maintaining couplers, and polarization-maintaining erbium-doped fiber amplifiers, was designed to keep the polarization states of the two beams consistent. By using the difference frequency of L-band dual lasers to excite the InGaAs high-performance photoconductive antenna, continuous terahertz radiation ranging from 0.1 to 2.7 THz was generated within the wavelength range of
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