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Title: Supercontinuum Fourier transform spectrometry with balanced detection on a single photodiode

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4961655· OSTI ID:1303027
 [1];  [2]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States); Howard Hughes Medical Inst., Ashburn, VA (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)

We demonstrate a method of combining a supercontinuum light source with a commercial Fourier transform spectrometer, using a novel approach to dual-beam balanced detection, implemented with phase-sensitive detection on a single light detector. A 40 dB reduction in the relative intensity noise is achieved for broadband light, analogous to conventional balanced detection methods using two matched photodetectors. Unlike conventional balanced detection, however, this method exploits the time structure of the broadband source to interleave signal and reference pulse trains in the time domain, recording the broadband differential signal at the fundamental pulse repetition frequency of the supercontinuum. The method is capable of real-time correction for instability in the supercontinuum spectral structure over a broad range of wavelengths and is compatible with commercially designed spectrometers. A proof-of-principle experimental setup is demonstrated for weak absorption in the 1500-1600 nm region.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC00112704; AC02-98CH10886; AC02- 98CH10886; SC0012704
OSTI ID:
1303027
Alternate ID(s):
OSTI ID: 1420632
Report Number(s):
BNL-112541-2016-JA; R&D Project: CO006; KC0301020
Journal Information:
Journal of Chemical Physics, Vol. 145, Issue 8; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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