Remote chemical detection in the atmosphere or some specific space has always been of
great interest in many applications for environmental protection and safety. Laser absorption …

Photoacoustic imaging (PAI) takes advantage of both optical and ultrasound imaging
properties to visualize optical absorption with high resolution and contrast. Photoacoustic …

Laser-based gas sensors are undergoing constant and rapid development due to their
usability in numerous applications focused on eg monitoring of greenhouse gases …

Photothermal spectroscopy with the optical pump-probe configuration has been used for
sensitive gas detection in hollow-core fibers. In this study, we demonstrate a new method of …

We demonstrated MIR-pump NIR-probe photothermal spectroscopy with the first harmonic
(PTS-) detection of formaldehyde, one of the most common volatile organic compounds …

This work reports on the implementation of a fiber-array with attached microlenses in the
balanced-detection Interferometric Cavity-Assisted Photothermal Spectroscopy (ICAPS) …

Photothermal interferometry (PTI) spectroscopy is a background-free and ultrasensitive gas
or chemical sensing method. To date, most works have focused on applying different …

A heterodyne interferometer-based signal retrieval in photoacoustic/photothermal gas
spectrometer using mid-infrared quantum cascade laser excitation is demonstrated. This …

Antiresonant Hollow-Core Fibers (ARHCFs), thanks to the excellent capability of guiding
light in an air core with low loss over a very broad spectral range, have attracted significant …

A novel configuration of a photothermal gas sensor is demonstrated. Photothermal-induced
gas refractive index (RI) modulation is probed by a simple, mode-locked (ML) ring cavity …