Work

High-resolution broadband (>100 cm^-1) infrared heterodyne spectro-radiometry using an external cavity quantum cascade laser

Year: 2008

Type: article

Abstract: Broadband thermal infrared heterodyne spectro-radiometry using an external cavity quantum cascade laser as a tunable local oscillator has been performed over a frequency range of more than 100 cm(-1) at a central frequency of 1190 cm(-1). Heterodyne spectro-radiometry is demonstrated for two local oscillator tuning modes: broadband tuning for transmission and emission spectroscopy of broadband absorbers (Freon 12), and broadband frequency selection in combination with fine continuous frequency tuning for high-resolution (0.021 cm(-1)) transmission spectroscopy (N(2)O). In each case concentration retrievals are performed and analyzed. The spectroradiometer noise level is demonstrated to be twenty two and eight times the fundamental shot-noise limit in the two scanning modes respectively.

Source: Optics Express

DOI: 10.1364/oe.17.000248

Authors: Damien Weidmann, Gerard Wysocki

Institutions: Rutherford Appleton Laboratory, Science and Technology Facilities Council, Princeton University

Language: English

Topic: Spectroscopy and Laser Applications

Subfield: Spectroscopy

Field: Chemistry

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funders: U.S. Department of Energy, Engineering Research Centers, Natural Environment Research Council