Analysis of a thermal lens in a diamond Raman laser operating at 1.1 kW output power

Sergei Antipov, Robert J. Williams, Alexander Sabella, Ondrej Kitzler, Amanuel Berhane, David J. Spence, Richard P. Mildren*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

We report experimental observations of thermal lens effects in a diamond Raman laser operating up to 1.1 kW output power in a quasi- steady-state regime. Measured changes in the output beam parameters as a function of output power, including beam quality factor and beam divergence after a fixed focusing lens, are compared to modelling enabling us to track the development of a thermal lens up to 16 diopters at maximum output power. Analysis shows that good agreement between model and experiment is obtained by considering the power deposition profile and the spatial overlap with the laser mode. The results clarify previous work that raised questions about thermal lens effects in the diamond gain medium and provides increased confidence in thermal models for determining the power limits for the current design.

Original languageEnglish
Pages (from-to)15232-15239
Number of pages8
JournalOptics Express
Volume28
Issue number10
DOIs
Publication statusPublished - 11 May 2020

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