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 1053.0nm, 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 1053.2nm, FHG in KD*P is NCPM by changing the crystal temperature from 17.9°C to 20.5°C. When driven with 2.4J of second harmonic radiation in a 3ns flat-top pulse, corresponding to 1GW/cm2 2ω drive intensity, 1.9J of fourth harmonic radiation was generated in a 6mm long KD*P crystal, yielding a second to fourth harmonic energy conversion efficiency of 79%.

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