title: High energy, high repetition rate, second harmonic generation in large aperture DKDP, YCOB, and LBO crystals.
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/cm2for 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/cm2and 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).
authors.forename: Jonathan P
authors.initials: JP
authors.lastname: Phillips
authors.forename: Saumyabrata
authors.initials: S
authors.lastname: Banerjee
authors.forename: Jodie
authors.initials: J
authors.lastname: Smith
authors.forename: Mike
authors.initials: M
authors.lastname: Fitton
authors.forename: Tristan
authors.initials: T
authors.lastname: Davenne
authors.forename: Klaus
authors.initials: K
authors.lastname: Ertel
authors.forename: Paul
authors.initials: P
authors.lastname: Mason
authors.forename: Thomas
authors.initials: T
authors.lastname: Butcher
authors.forename: Mariastefania
authors.initials: M
authors.lastname: De Vido
authors.forename: Justin
authors.initials: J
authors.lastname: Greenhalgh
authors.forename: Chris
authors.initials: C
authors.lastname: Edwards
authors.forename: Cristina
authors.initials: C
authors.lastname: Hernandez-Gomez
authors.forename: John
authors.initials: J
authors.lastname: Collier