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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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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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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Highly coherent hybrid dual-comb spectrometer.

Sutapa Ghosh, Gadi Eisenstein

    Optics Express
    |July 21, 2023
    PubMed
    Summary

    This study presents a hybrid dual-comb spectrometer (DCS) combining fiber and semiconductor lasers for enhanced stability and coherence. Achieving 100-second coherence time, this system advances broadband spectroscopy capabilities.

    Area of Science:

    • Spectroscopy
    • Laser Physics
    • Optical Engineering

    Background:

    • Dual comb spectroscopy (DCS) offers high resolution and fast acquisition but relies on complex, stabilized laser systems.
    • Semiconductor lasers are cost-effective and tunable but have limited bandwidth, hindering broadband DCS applications.
    • Current DCS designs face challenges in achieving long mutual coherence times between laser sources.

    Purpose of the Study:

    • To develop a hybrid dual-comb spectrometer integrating broadband fiber lasers and narrow-bandwidth semiconductor lasers.
    • To overcome the limitations of existing DCS systems by enhancing coherence time and spectral stability.
    • To investigate and mitigate factors affecting laser locking quality in broadband comb lasers.

    Main Methods:

    • A hybrid dual-comb spectrometer was constructed using a broadband fiber laser (FC) and an actively mode-locked semiconductor laser (MLL).

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  • Injection locking the MLL to a continuous wave (CW) laser, itself locked to the FC, achieved a mutual coherence time of approximately 100 seconds.
  • A method for direct stabilization of the FC's entire spectrum to a high-finesse cavity was implemented.
  • The influence of cavity dispersion on laser locking quality was analyzed.

    • Main Results:

    • A mutual coherence time of around 100 seconds was successfully achieved between the fiber and semiconductor lasers.
    • The hybrid DCS demonstrated long-term stability of 5 × 10-12 at 1 second and 5 × 10-14 at 350 seconds.
    • The study identified and addressed the impact of cavity dispersion on the locking quality of broadband comb lasers.

    Conclusions:

    • The developed hybrid dual-comb spectrometer successfully combines the advantages of broadband fiber lasers and tunable semiconductor lasers.
    • The achieved long coherence time and high stability represent a significant advancement for broadband spectroscopy.
    • This work provides critical insights into laser stabilization and cavity dispersion effects for future DCS development.