Supercontinuum Fourier transform spectrometry with balanced detection on a single photodiode
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.
- OSTI ID:
- 22678899
- Journal Information:
- Journal of Chemical Physics, Vol. 145, Issue 8; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
Baseline-free quantitative absorption spectroscopy based on cepstral analysis
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journal | January 2019 |
Background-free broadband absorption spectroscopy based on interferometric suppression with a sign-inverted waveform
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journal | January 2019 |
| Baseline-free Quantitative Absorption Spectroscopy Based on Cepstral Analysis | text | January 2019 |
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