Energy scaling, second Stokes oscillation and Raman gain-guiding in monolithic diamond Raman lasers

Vasili G. Savitski, Giorgos Demetriou, Sean Reilly, Hangyu Liu, Erdan Gu, Martin D. Dawson, Alan Kemp

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Abstract

Energy scaling of the 1st Stokes oscillation is compared in micro-lensed and plane-plane monolithic diamond Raman lasers under 532 nm pumping. A maximum Raman pulse energy of 92 µJ at 573 nm was achieved with the micro-lensed device, while in a plane-plane configuration the maximum Raman pulse energy was 3.1 mJ. 2nd Stokes generation at 620 nm in 2 and 1 mm long micro-lensed monolithic diamond Raman lasers is also reported. The best conversion efficiency from the pump at 532 nm, namely 63 %, was observed in a 2 mm long crystal at the pump pulse intensity of 4.5 GW/cm2. By measuring the output Raman laser beam caustic it was found that the 2nd Stokes intracavity beam radius at the output coupler of the micro-lensed device is at least two times smaller than that expected from the ABCD matrix calculations of the resonator mode. A Raman gain-guiding mechanism is suggested to explain this difference.
Original languageEnglish
Article number1700408
Number of pages8
JournalIEEE Journal of Quantum Electronics
Volume54
Issue number6
Early online date11 Oct 2018
DOIs
Publication statusPublished - 31 Dec 2018

Keywords

  • diamond Raman lasers
  • Raman scattering
  • solid lasers

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