Title

Longitudinal Mode Selection In Laser Cavity By Moiré Volume Bragg Grating

Keywords

Fabry-Perot; infrared; interferometer; quantum cascade laser; sensor

Abstract

A quantum cascade laser at IR wavelengths with an open external cavity presents an opportunity for spectral sensing of molecular compounds that have low vapor pressure. The sensitivity of such a system is potentially very high due to extraordinarily long effective optical paths that can be achieved in an active cavity. We demonstrate here an external cavity mid-IR QCL molecular absorption sensor using a fixed Fabry-Perot etalon as the spectrum analyzer. The system is sensitive to the water vapor present in the laboratory air with an absorption coefficient of just 9.6 x 10 -8 cm -1. The system is sensitive enough to detect the absorption coefficient of TNT vapor at room temperature. © 2012 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

Publication Date

3-6-2012

Publication Title

Progress in Biomedical Optics and Imaging - Proceedings of SPIE

Volume

8236

Number of Pages

-

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/12.909465

Socpus ID

84857674390 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84857674390

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