Efficient, High Gain Parametric Generation in ADP Continuously Tunable across the Visible Spectrum

摘要

Coherent visible light, continuously tunable over the range from 4200A to 7300A, has been obtained by pumping an ammonium dihydrogen phosphate (ADP) crystal with ultraviolet fourth harmonic of a Nd:YAG laser. Parametric gains sufficient to produce up to 25% average power conversion of the pump to the tunable visible output were obtained without the use of an external resonator. The output radiation typically had a 5A bandwidth, two nanosecond pulse duration, 100 kW peak power, and 5 mW average power at 30 pps. Wavelength tuning was accomplished either by varying the crystal temperature or its orientation with respect to the pump beam. Angle tuning allows the output to be rapidly tuned across the visible spectrum. (Author)