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13 March 2019 Dynamics in a 1.2 kW quasi-continuous-wave diamond Raman laser with low-coherence pumping (Conference Presentation)
Sergei Antipov, Alexander Sabella, Robert J. Williams, Ondrej Kitzler, David J. Spence, Richard P. Mildren
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Proceedings Volume 10896, Solid State Lasers XXVIII: Technology and Devices; 1089613 (2019) https://doi.org/10.1117/12.2509269
Event: SPIE LASE, 2019, San Francisco, California, United States
Abstract
A quasi-continuous-wave external cavity diamond Raman laser with 1.2 kW output power was demonstrated using gated pump pulses of 100 µs duration, which was 7 times longer than the time constant for the establishment of steady-state temperature gradients. An 83% slope efficiency and a 53% optical-to-optical efficiency were obtained in conversion from a 1.064 µm Nd:YAG pump to a 1.24 µm first Stokes. The transient Stokes behavior from the sharp turn-on was consistent with calculations for the first Stokes build-up time. A brightness enhancement factor of 56 was obtained from the M2 = 15 pump beam. An observed increase in the first Stokes beam quality from M2 = 2.95 to M2 = 1.25 with increase of the Raman laser output power indicated the presence of a steady-state thermal lens in diamond.
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Sergei Antipov, Alexander Sabella, Robert J. Williams, Ondrej Kitzler, David J. Spence, and Richard P. Mildren "Dynamics in a 1.2 kW quasi-continuous-wave diamond Raman laser with low-coherence pumping (Conference Presentation)", Proc. SPIE 10896, Solid State Lasers XXVIII: Technology and Devices, 1089613 (13 March 2019); https://doi.org/10.1117/12.2509269
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KEYWORDS
Diamond
Raman spectroscopy
Optical pumping
Nd:YAG lasers
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