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Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy

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Spectral broadening in convex-concave multipass cells.

Victor Hariton, Kilian Fritsch, Kevin Schwarz

|June 29, 2023

Summary

This summary is machine-generated.

A new multi-pass spectral broadening technique overcomes energy scaling limitations. This novel convex-concave arrangement achieves high efficiency and excellent beam quality for laser pulse amplification.

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Area of Science:

Laser Physics
Nonlinear Optics
Ultrafast Lasers

Background:

Multi-pass spectral broadening is a key technique for amplifying laser pulse energy and peak power.
Current energy scaling is limited by optical damage, gas ionization, and beam inhomogeneity.

Purpose of the Study:

To introduce and validate a novel multi-pass convex-concave arrangement for overcoming spectral broadening limitations.
To demonstrate energy scaling of laser pulses with improved beam quality.

Main Methods:

Utilized a proof-of-principle experiment with a convex-concave multi-pass setup.
Employed spectral broadening of ultrashort laser pulses (260 fs, 15-200 µJ).
Simulated the concept for higher energy pulses (40 mJ, 1.3 ps).

Main Results:

Achieved spectral broadening and subsequent compression to approximately 50 fs.
Demonstrated high energy conversion efficiency of 90%.
Obtained excellent spatio-spectral homogeneity across the beam profile.

Conclusions:

The novel multi-pass convex-concave arrangement effectively overcomes limitations in energy scaling for spectral broadening.
The technique shows promise for further scaling to joule-level energies.
This advancement is crucial for applications requiring high-energy, high-quality ultrashort laser pulses.