Laser & Photonics Review, Год журнала: 2025, Номер unknown

Опубликована: Май 9, 2025

Abstract In this paper, an ultrahigh sensitive light‐induced thermoelastic spectroscopy (LITES) sensor based on a trilayer ultrathin perfect absorber coated T‐head quartz tuning fork (QTF) is reported for the first time. The designed according to streamlined theoretical framework admittance matching principles. incorporation of Cr as primary and dual‐layer anti‐reflection coating SiO 2 Si in tri‐layer (Si‐SiO ‐Cr) ultra‐thin enables high absorption across wide spectral range. It results 93% absorbance 1530 nm laser by QTF. This feature enhances QTF's photothermal‐elastic‐electric conversion efficiency detection sensitivity. self‐designed QTF with low resonant frequency 8.78 kHz beneficial increase energy accumulation signal‐to‐noise ratio increases 3.35‐fold after absorber, it 6.90 times greater than that standard To achieve ultra‐high acetylene (C H ) detection, 40 m fiber‐coupled multi‐pass cell erbium‐doped fiber amplifier are integrated into sensing system augment target gas's boost power. Finally, minimum detecting limit (MDL) 209.59 ppt obtained, indicating sensitivity best MDL among all C ‐LITES sensors. work paves effective new way enhance LITES sensor, can provide broader enhancement detect additional gases optimized architecture.

Язык: Английский