Balanced detection for interferometry with a noisy source

E. C. Robinson, J. Traegardh, I. D. Lindsay, H. Gersen

Research output: Contribution to journalArticle (Academic Journal)peer-review

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Abstract

Optical properties of nanostructures depend on size, shape, material, and local environment. These characteristics can be probed interferometrically, given a broadband source. However, broadband supercontinuum sources are intrinsically noisy, limiting the measurement sensitivity. In this article we describe the application of an auto-balancing technique to reduce the noise in a broadband supercontinuum source, thus increasing the signal to noise ratio. We show a noise reduction of 41 dB allowing optical powers as small as 0.01 pW to be interferometrically detected with a 5 ms integration time. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4729474]

Original languageEnglish
Article number063705
Pages (from-to)-
Number of pages6
JournalReview of Scientific Instruments
Volume83
Issue number6
DOIs
Publication statusPublished - Jun 2012

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