In this work, we report on the novel employment of lithium niobate tuning forks as acoustic transducers in photoacoustic spectroscopy for gas sensing. The lithium niobate tuning fork (LiNTF) exhibits a fundamental resonance frequency of 39196.6 Hz and a quality factor Q = 5900 at atmospheric pressure. The possibility to operate the LiNTF as a photoacoustic wave detector was demonstrated targeting a water vapor absorption line falling at 7181.14 cm⁻¹ (1.39 µm). A noise equivalent concentration of 2 ppm was reached with a signal integration time of 20 s. These preliminary results open the path towards integrated photonic devices for gas sensing with LiNTF-based detectors on lithium niobate platforms.

在这项工作中，我们报告了铌酸锂音叉作为声换能器在气体传感光声光谱中的新应用。铌酸锂音叉 (LiNTF) 在大气压下表现出 39196.6 Hz 的基本谐振频率和 Q = 5900 的品质因数。^{以落在 7181.14 cm -1} (1.39 µm)的水蒸气吸收线为目标，证明了将 LiNTF 作为光声波检测器进行操作的可能性。信号积分时间为 20 秒，噪声等效浓度达到 2 ppm。这些初步结果为在铌酸锂平台上使用基于 LiNTF 的探测器进行气体传感的集成光子器件开辟了道路。