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Heterodyne architecture for tunable laser chirped dispersion spectroscopy using optical processing

2014; Optica Publishing Group; Volume: 39; Issue: 9 Linguagem: Inglês

10.1364/ol.39.002611

1539-4794

Pedro Martín‐Mateos, Borja Jerez, Pablo Acedo,

Advanced Fiber Laser Technologies

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.