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Enhancing the sensitivity of mid-IR quantum cascade laser-based cavity-enhanced absorption spectroscopy using RF current perturbation.

Abstract:

The sensitivity of mid-IR quantum cascade laser (QCL) off-axis cavity-enhanced absorption spectroscopy (CEAS), often limited by cavity mode structure and diffraction losses, was enhanced by applying a broadband RF noise to the laser current. A pump-probe measurement demonstrated that the addition of bandwidth-limited white noise effectively increased the laser linewidth, thereby reducing mode structure associated with CEAS. The broadband noise source offers a more sensitive, more robust alter...

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Publication status:
Published

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Publisher copy:
10.1364/ol.39.006811

Authors


Manfred, KM More by this author
Kirkbride, JM More by this author
Ciaffoni, L More by this author
More by this author
Institution:
University of Oxford
Department:
Oxford, MPLS, Chemistry, Physical and Theoretical Chem
Ritchie, GA More by this author
Publisher:
Optical Society of American (OSA)
Journal:
Optics letters
Volume:
39
Issue:
24
Pages:
6811-6814
Publication date:
2014-12-05
DOI:
EISSN:
1539-4794
ISSN:
0146-9592
URN:
uuid:4c4963bf-25b7-4d25-8f2d-f5e9952276df
Source identifiers:
502067
Local pid:
pubs:502067
Language:
English

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