Nonlinear absorption in lithium triborate frequency converters for high-power ultrafast lasers

Author:

Röcker Christoph1ORCID,Weinert Pascal1ORCID,Villeval Philippe2,Lupinski Dominique2,Delaigue Martin3,Hönninger Clemens3,Weber Rudolf1,Graf Thomas1,Ahmed Marwan Abdou1

Affiliation:

1. Universität Stuttgart

2. Cristal Laser

3. Amplitude Systemes

Abstract

We report on an analysis of the nonlinear absorption in lithium triborate (LBO) used for second and third harmonic generation of ultrashort laser pulses at average powers in the order of kW and with sub-picosecond pulse duration. Thermographic imaging of the LBO crystals together with a simple analytical model revealed the presence of nonlinear absorption in both harmonic generation processes. Subsequent processing with a numerical model considering the nonlinear mixing, the absorption, and the heat conduction was used to estimate the absorption coefficients. Average powers exceeding 100 W in the ultraviolet and 400 W in the visible spectral range were obtained while maintaining a good beam quality by avoiding excessive nonlinear absorption.

Funder

Horizon 2020 Framework Programme

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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