1.2 kW quasi-steady-state diamond Raman laser pumped by an M2 = 15 beam

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)


An external cavity diamond Raman laser with 1.2 kW output power is demonstrated for durations 7 times longer than the thermal lens time constant. An 83% slope efficiency and a 53% optical-to-optical efficiency were obtained for conversion from a 1.06 μm pump to the 1.24 μm first Stokes. The pump had an M2 of 15, demonstrating that efficiency is maintained at the highest levels even when using exceptionally poor quality pumps. We show that a measured decrease in the output beam quality factor from M2 2.95 to M2 1.25 as power increased is evidence for thermal lens development in the diamond. The results foreshadow development of continuous-wave kilowatt-class lasers or amplifiers based on single diamond elements and pumped efficiently by lasers having poor spatial coherence such as line-narrowed diode laser arrays.

Original languageEnglish
Pages (from-to)2506-2509
Number of pages4
JournalOptics Letters
Issue number10
Publication statusPublished - 15 May 2019


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