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Pulse front tilt control using non-collimated beams in a single pass grating compressor.

Gonçalo Figueira, Luís Braga, Sajidah Ahmed

    Optics Express
    |April 1, 2020
    PubMed
    Summary

    High power laser pulse compression using chirped pulse amplification (CPA) can introduce pulse front tilt. This study shows beam curvature, not just collimation, controls tilt, offering a new method for pulse front manipulation.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Nonlinear Optics

    Background:

    • Chirped Pulse Amplification (CPA) is crucial for high-power lasers, utilizing grating pairs for pulse compression.
    • Accurate pulse compression typically assumes ideal beam collimation to prevent spatio-temporal couplings.
    • Deviations from perfect collimation can impact pulse quality and temporal characteristics.

    Purpose of the Study:

    • To investigate the impact of beam curvature on pulse compression in CPA systems.
    • To analyze pulse propagation through a single-pass compressor without assuming perfect beam collimation.
    • To demonstrate a controllable mechanism for pulse front tilt generation.

    Main Methods:

    • Theoretical analysis of pulse propagation through a grating-based pulse compressor.

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  • Modeling the effects of beam divergence and convergence (curvature) on the compressed pulse.
  • Experimental validation using a large-scale CPA laser system with controlled beam curvatures.

    • Main Results:

    • Pulse compression without the 'good collimation' approximation leads to pulse front tilt.
    • The magnitude of the pulse front tilt is directly proportional to the normalized distance from the beam waist.
    • Experimental results confirm the theoretical predictions across various beam curvatures.

    Conclusions:

    • Beam curvature is a significant factor in pulse compressor design for CPA systems.
    • Pulse front tilt can be intentionally controlled by managing beam curvature, offering a novel tuning parameter.
    • This finding provides a practical method for manipulating spatio-temporal properties in high-power laser pulses.