Abstract
In this Letter, a side-excitation light-induced thermoelastic spectroscopy (SE-LITES) technique was developed for trace gas detection. A novel, to the best of our knowledge, custom quartz tuning fork (QTF) was used as a transducer for photon detection by the thermoelastic effect. The mechanical stress distribution on the QTF surface was analyzed to identify the optimum thermoelastic excitation approach. The electrode film on the QTF surface also works as a partially reflective layer to obtain a long optical absorption path inside the QTF body. With the long optical absorption length and the inner face excitation of the QTF, the thermoelastic effect was greatly enhanced. With an optimized modulation depth, a signal-to-noise ratio (SNR) improvement of more than one order of magnitude was achieved, compared to traditional LITES.
© 2023 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Xiaonan Liu and Yufei Ma
Opt. Lett. 48(21) 5687-5690 (2023)
Shunda Qiao, Pengze Ma, Viktor Tsepelin, Guowei Han, Jinxing Liang, Wei Ren, Huadan Zheng, and Yufei Ma
Opt. Lett. 48(2) 419-422 (2023)
Ying He, Yufei Ma, Yao Tong, Xin Yu, and Frank K. Tittel
Opt. Lett. 44(8) 1904-1907 (2019)