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Experimental method of transfer function linewidth determination for laser amplifiers using FM-to-AM conversion.

Elodie Boursier, Hadrien Devaine, Alain Braud

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    We developed a new method to measure laser amplifier linewidth using frequency modulation to amplitude modulation (FM-to-AM) scans. This technique reveals that Q-switched laser output spectra do not accurately represent the amplifier

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Spectroscopy

    Background:

    • Characterizing laser amplifier performance is crucial for many optical applications.
    • Accurate determination of transfer function linewidth is essential for predicting laser behavior.
    • Existing methods may not fully capture the dynamic characteristics of laser amplifiers.

    Purpose of the Study:

    • To propose and validate an experimental method for determining the transfer function linewidth of a laser amplifier.
    • To investigate the relationship between amplifier transfer function and output spectrum.
    • To assess the suitability of Q-switched laser output spectra as representative of amplifier characteristics.

    Main Methods:

    • Development of an experimental technique based on transfer function scanning.
    • Utilizing frequency modulation to amplitude modulation (FM-to-AM) temporal modulation measurements.
    • Performing measurements as a function of wavelength to map the transfer function.

    Main Results:

    • Successfully implemented an experimental method for transfer function linewidth determination.
    • Demonstrated that the output spectrum of a laser amplifier in Q-switch mode is not representative of its transfer function.
    • Provided wavelength-dependent measurements of the amplifier's temporal modulation characteristics.

    Conclusions:

    • The proposed FM-to-AM scan method provides a more accurate measure of laser amplifier transfer function linewidth.
    • Q-switched output spectra are insufficient for representing the true transfer function of the amplifier.
    • This work offers a new tool for precise laser amplifier characterization.