Abstract

Gigahertz modulated, tunable output in the visible and near-infrared was generated using a KTP (potassium titanyl phosphate) based optical parametric oscillator synchronously pumped with the second harmonic of a coherently-heterodyned Nd:YAG laser. The 5 × 5 × 10mm KTP crystal was cut at 49° for collinear phase-matching to produce signal outputs from 0.69 µm to 0.71 µm and the corresponding idler waves from 2.2 pm to 2.1 pm. We found, the output energy to be fairly robust where the cavity length required to maintain the sinusoidal modulation of the output beam was close to an integer multiple of the interpulse spacing. The output energy, bandwidths, and temporal profiles of the OPO were investigated using a singly-resonant oscillator in a linear configuration.

© 1993 Optical Society of America