Signal line shapes of Fourier-transform cavity-enhanced frequency modulation spectroscopy with optical frequency combs

Frequency modulation Fourier transform spectroscopy

A new method, FM-FTS, combining Frequency Modulation heterodyne laser spectroscopy and Fourier Transform Spectroscopy is presented. It provides simultaneous sensitive measurement of absorption and dispersion profiles with broadband spectral coverage capabilities. Experimental demonstration is made on the overtone spectrum of C2H2 in the 1.5 μm region. OCIS codes: 120.6200, 300.6300, 300.6380, 3...

Cavity-Enhanced Frequency Modulation Spectroscopy: Advancing Optical Detection Sensitivity and Laser Frequency Stabilization

High detection sensitivities of quantum absorptions are important in many research fields of physics, chemistry and biology. In this paper we present our latest results on the ultrasensitive molecular overtone spectroscopy using the cavity-enhanced frequency modulation (FM) technique. The principle of this method makes use of a high-finesse external cavity to enhance the intrinsic resonance con...

Human breath analysis via cavity-enhanced optical frequency comb spectroscopy

Cavity-enhanced direct frequency comb spectroscopy

Cavity-enhanced direct frequency comb spectroscopy combines broad spectral bandwidth, high spectral resolution, precise frequency calibration, and ultrahigh detection sensitivity, all in one experimental platform based on an optical frequency comb interacting with a high-finesse optical cavity. Precise control of the optical frequency comb allows highly efficient, coherent coupling of individua...

Fourier transform spectroscopy with a laser frequency comb

Molecular fingerprinting using absorption spectroscopy is a powerful analytical method, particularly in the infrared, the region of intense spectral signatures. Fourier transform spectroscopy—the widely used and essential tool for broadband spectroscopy—enables the recording of multi-octavespanning spectra, exhibiting 100 MHz resolution with an accuracy of 13 10 and 13 10 in wavenumber and inte...