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Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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Related Experiment Video

Updated: Apr 26, 2026

Quasi-light Storage for Optical Data Packets
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[Absorption spectrum of Quasi-continuous laser modulation demodulation method].

Xin Shao, Fu-Gui Liu, Zhen-Hui Du

    Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
    |August 7, 2014
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    Summary

    A new software phase-locked amplifier method enhances the detection of quasi-continuous laser wavelength modulation spectroscopy (WMS) signals. This technique significantly improves sensitivity and reduces detection limits for WMS-2f signals.

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    Area of Science:

    • Optical Spectroscopy
    • Signal Processing
    • Laser Technology

    Context:

    • Quasi-continuous laser wavelength modulation spectroscopy (WMS) presents challenges for accurate signal demodulation.
    • Traditional methods struggle with signals having small duty cycles, leading to issues like phase-locking failure and waveform distortion.

    Purpose:

    • To propose and validate a software-based phase-locked amplifier demodulation method for quasi-continuous WMS signals.
    • To improve the sensitivity and detection limits of WMS measurements for gases like carbon dioxide.

    Summary:

    • The proposed method analyzes signal characteristics to effectively demodulate the second harmonic (2f) signal in quasi-continuous WMS.
    • It incorporates data validation, filtering, phase-sensitive detection, and digital filtering for robust signal processing.
    • Experimental validation using carbon dioxide detection demonstrated superior performance compared to a high-performance commercial lock-in amplifier (SR844).

    Impact:

    • The software method achieved an Allan variance one order of magnitude lower than the SR844, enabling a two-order-of-magnitude improvement in detection limit.
    • Successfully addresses the phase-locking issue common with low-duty-cycle quasi-continuous modulation signals.
    • Minimizes signal waveform distortion, leading to more accurate and reliable spectroscopic measurements.