Dispersion-based spectroscopic techniques present many desirable features when compared with classical absorption spectroscopy implementations, such as the normalization-free operation and the extended dynamic range. In this Letter, we present a new sensor design based on direct optical processing for heterodyne conversion in tunable laser chirped dispersion spectroscopy that allows sensor implementations using low-speed photodetectors and low-cost FM demodulators. The performance of the new setup has been validated using as a target the ro-vibrational transition of methane at approximately 1650.96 nm.
© 2014 Optical Society of America
Original Manuscript: February 21, 2014
Revised Manuscript: March 26, 2014
Manuscript Accepted: March 26, 2014
Published: April 21, 2014
Pedro Martín-Mateos, Borja Jerez, and Pablo Acedo, "Heterodyne architecture for tunable laser chirped dispersion spectroscopy using optical processing," Opt. Lett. 39, 2611-2613 (2014)