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Frequency comb offset dynamics of SESAM modelocked thin disk lasers.

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    We studied carrier-envelope offset (CEO) frequency dynamics in high-power thin disk lasers (TDLs). Pump diode noise is a key factor, but laser cavity dynamics are crucial for CEO frequency stabilization.

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    Area of Science:

    • * Laser Physics
    • * Nonlinear Optics
    • * Ultrafast Lasers

    Background:

    • * High-power thin disk lasers (TDLs) are essential for various applications.
    • * Understanding and controlling carrier-envelope offset (CEO) frequency dynamics is critical for frequency stabilization.
    • * Previous studies have focused on lower-power systems, leaving a gap in high-power TDL analysis.

    Purpose of the Study:

    • * To investigate the carrier-envelope offset (CEO) frequency dynamics in high-power SESAM modelocked thin disk lasers (TDLs).
    • * To identify key noise sources and their propagation through the laser system.
    • * To provide guidelines for future frequency stabilization of multi-100-W oscillators.

    Main Methods:

    • * Detailed noise characterization and transfer function (TF) measurements of two TDLs (Yb:YAG and Yb:CALGO).
    • * Comparison of experimental TFs with theoretical models to understand noise propagation.
    • * Analysis of pump diode relative intensity noise (RIN) and its impact on CEO frequency.

    Main Results:

    • * Demonstrated CEO frequency detection with >30 dB SNR in a 140 W Yb:YAG TDL.
    • * Identified pump diode RIN as the primary contributor to CEO frequency noise.
    • * Showcased the critical role of laser cavity dynamics, with differing TFs explaining stabilization differences between lasers.

    Conclusions:

    • * CEO frequency stabilization is achievable in high-power TDLs, despite pump noise.
    • * Laser cavity design, particularly damping of relaxation oscillations via nonlinear elements like SESAMs, is essential for tight CEO frequency locking.
    • * Optimizing SESAM operation and potentially adding supplementary damping components are recommended for effective CEO stabilization.