title: Noncritically phase-matched fourth harmonic generation of Nd:glass lasers in partially deuterated KDP crystals.
abstract: Noncritically phase-matched (NCPM) fourth harmonic generation (FHG) of Nd:glass laser radiation in partially deuterated dihydrogen phosphate (KD*P) crystals has been demonstrated. At an Nd:glass laser wavelength of 1053.0 nm, NCPM FHG is achieved in 70% deuterated KD*P at a crystal temperature of 18.5±0.1 °C. Tuning the fundamental laser wavelength from 1052.9 to 1053.2 nm, FHG in KD*P is NCPM by changing the crystal temperature from 17.9 °C to 20.5 °C. When driven with 2.4 J of second harmonic radiation in a 3 ns flat-top pulse, corresponding to 1 GW/cm(2) 2ω drive intensity, 1.9 J of fourth harmonic radiation was generated in a 6 mm long KD*P crystal, yielding a second to fourth harmonic energy conversion efficiency of 79%.
authors: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA. yang9@llnl.gov
authors: Steven T
authors: ST
authors: Yang
authors: Mark A
authors: MA
authors: Henesian
authors: Timothy L
authors: TL
authors: Weiland
authors: James L
authors: JL
authors: Vickers
authors: Ronald L
authors: RL
authors: Luthi
authors: John P
authors: JP
authors: Bielecki
authors: Paul J
authors: PJ
authors: Wegner