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Updated: Jun 3, 2026

High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis
Published on: September 22, 2017
Single-sideband spectrally resolution-enhanced laser heterodyne spectrometer for upper atmospheric sensing
Abstract:
A single-sideband laser heterodyne spectrometer (LHS) was developed for the first time, to the best of our knowledge. A multi-channel configuration employing different band-pass filters and frequency-shifted LOs achieves single-sideband detection at the hardware level, thereby eliminating the central dip distortion inherent in conventional dual-sideband LHS. The operation of the single-sideband LHS was analyzed and experimentally validated through optimization of the frequency shift of acousto-optic modulators and the bandwidth of radio-frequency filters, yielding a two-fold enhancement in spectral resolution. The performance of the single-sideband LHS was evaluated and validated through measurements of methane absorption spectra. The results demonstrate a significant improvement in spectral fidelity, with the error reduced by 64% compared with conventional dual-sideband LHS. The single-sideband LHS reported in this paper is expected to provide a powerful tool with high spectral resolution and high accuracy for remote sensing of upper atmospheric gases and planetary atmospheric molecules.
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