Optical Absorption Spectrometry using Laser Amplitude Modulation

Date

2009

Authors

Chow, Jong
Wade, Andrew
Mow-Lowry, C
Rabeling, David
Littler, Ian
McClelland, David
Gray, Malcolm B

Journal Title

Journal ISSN

Volume Title

Publisher

Institute of Electrical and Electronics Engineers (IEEE Inc)

Abstract

We present a new technique for cavity enhanced optical absorption spectrometry, employing a radio-frequency amplitude modulated laser to interrogate an optical cavity. It is capable of sensing molecular absorption at the fundamental laser shot noise limit, and is able to perform quantum noise limited gas sensing at atmospheric pressure. We implement this technique, for the first time, in a free space cavity, and demonstrate that the demodulated error signal can be used to measure losses in a resonator.

Description

Keywords

Keywords: Amplitude-modulated laser; Error signal; Free space; Gas sensing; Laser shots; Molecular absorption; Noise limit; Optical absorption; Optical cavities; Radio frequencies; Amplitude modulation; Atmospheric pressure; Gas absorption; Light absorption; Sensor

Citation

Source

IEEE Sensors 2009

Type

Conference paper

Book Title

Entity type

Access Statement

License Rights

Restricted until

2037-12-31