1. High energy, high repetition rate, second harmonic generation in large aperture DKDP, YCOB, and LBO crystals
- Author
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Jodie Smith, John Collier, Mike Fitton, Thomas Butcher, J. Greenhalgh, Chris Edwards, T. Davenne, Jonathan Phillips, Klaus Ertel, Paul Mason, Saumyabrata Banerjee, Cristina Hernandez-Gomez, and Mariastefania De Vido
- Subjects
High energy ,Materials science ,business.industry ,Energy conversion efficiency ,Nonlinear optics ,Second-harmonic generation ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Laser ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,law.invention ,Intensity (physics) ,010309 optics ,Optics ,law ,0103 physical sciences ,Diode-pumped solid-state laser ,Optoelectronics ,0210 nano-technology ,business ,Adaptive optics - Abstract
We report on type-I phase-matched second harmonic generation (SHG) in three nonlinear crystals: DKDP (98% deuteration), YCOB (XZ plane), and LBO (XY plane), of 8 J, 10 Hz cryogenic gas cooled Yb:YAG laser operating at 1029.5 nm. DKDP exhibited an efficiency of 45% at a peak fundamental intensity of 0.24 GW/cmsup2/supfor 10 Hz operation at 10 ns. At the same intensity and repetition rate, YCOB and LBO showed 50% and 65% conversion efficiencies, respectively. Significant improvement in conversion efficiency, to a maximum of 82%, was demonstrated in LBO at 0.7 GW/cmsup2/supand 10 Hz, generating output energy of 5.6 J at 514.75 nm, without damage or degradation. However, no improvement in conversion efficiency was recorded for YCOB at this increased intensity. Additionally, we present theoretically calculated temperature maps for both 10 J and 100 J operation at 10 Hz, and discuss the suitability of these three crystals for frequency conversion of a 100 J, 10 Hz diode pumped solid state laser (DPSSL).
- Published
- 2016