302 W quasi-continuous cascaded diamond Raman laser at 1.5 microns with large brightness enhancement

Zhenxu Bai, Robert J. Williams*, Ondrej Kitzler, Soumya Sarang, David J. Spence, Richard P. Mildren

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We report a second Stokes diamond Raman laser at 1.49 μm capable of high power and large-scale-factor brightness enhancement. Using a quasi-continuous 1.06 μm pump of power 823 W (0.85% duty cycle) and M2 up to 6.4, a maximum output power of 302 W was obtained with an M2 = 1.1 providing an overall brightness enhancement factor of 6.0. The pulse length of ~210 μs was selected to ensure operation was representative of steady-state continuous lasing conditions in the diamond bulk. Accompanying theoretical calculations indicate that even more strongly aberrated pumps may be used to efficiently generate high beam quality output and with higher brightness enhancement factors. This diamond-based beam conversion technique addresses needs for high brightness and efficient eye-safe sources using low-brightness 1 μm pumps and reveals a widely-applicable route to practical high brightness lasers of increased wavelength range.

Original languageEnglish
Pages (from-to)19797-19803
Number of pages7
JournalOptics Express
Volume26
Issue number16
DOIs
Publication statusPublished - 6 Aug 2018

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