Broadband Tunable Photon-Pair Generation and Spectrum Measurement Based on Noncritical Lithium Niobate Crystals
Abstract
Photon pairs play a vital role in modern science, driving extensive research into their generation. Yet, the narrow phase-matching bandwidth of conventional crystals has largely confined studies to specific wavelengths, leaving research on broadband tunable sources underexplored. Here, we employ a non-critical phase-matched lithium niobate (LN) crystal to generate widely tunable photon pairs. The generated near-infrared (NIR) photon pairs exhibit a high coincidence-to-accidental ratio (CAR > 20 dB) and are tunable across the 800-1600 nm range. We further showcase the utility of NIR photon pairs in spectroscopy by detecting carbon monoxide (CO) gas absorption. This approach will facilitate the design of advanced LN-based photonic experiments.
Keywords
Cite
@article{arxiv.2602.11752,
title = {Broadband Tunable Photon-Pair Generation and Spectrum Measurement Based on Noncritical Lithium Niobate Crystals},
author = {Zhao-Qi-Zhi Han and Bo-Wen Liu and He Zhang and Zhi-You Li and Xiao-Hua Wang and Jin-Peng Li and Zheng-He Zhou and Qi-Yu Chen and Yin-Hai Li and Zhi-Yuan Zhou and Bao-Sen Shi},
journal= {arXiv preprint arXiv:2602.11752},
year = {2026}
}
Comments
13 pages, 8 figures