Title

Intracavity Trace Molecular Detection With A Broadband Mid-Ir Frequency Comb Source

Abstract

Ultrasensitive detection of methane, isotopic carbon dioxide, carbon monoxide, formaldehyde, acetylene, and ethylene is performed in the spectral range 2.5-5 μm using intracavity spectroscopy in broadband optical parametric oscillators (OPOs). The OPOs were operated near degeneracy and synchronously pumped either by a mode-locked erbium (1560 nm) or thulium (2050 nm) fiber laser. A large instantaneous bandwidth of up to 800 cm-1 allows for simultaneous detection of several gases. We observe an effective path-length enhancement due to coherent interaction inside the OPO cavity and achieve part-per-billion sensitivity levels. The measured spectral shapes are in good agreement with a model that takes into account group delay dispersion across the broad OPO frequency band. © 2013 Optical Society of America.

Publication Date

1-1-2013

Publication Title

Journal of the Optical Society of America B: Optical Physics

Volume

30

Issue

3

Number of Pages

631-640

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/JOSAB.30.000631

Socpus ID

84875577836 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84875577836

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