OPTICAL COMB GENERATOR AS AN EFFICIENT SHORT-PULSE SOURCE

We demonstrate a novel technique for converting a continuous-wave lase r beam into a stable train of short pulses with a high repetition rate . The system, which is generally applicable, is based on a purely pass ive coupled-cavity optical frequency comb generator, which ensures a h igh overall efficiency. The repetition rate of the device is determine d by the drive frequency of an electro-optic modulator and the pulse w idth by the rf power applied to the modulator. We have observed pulses down to 3.3 ps long at a 5.34-GHz repetition rate and an overall effi ciency of 11%. The experimental results for pulse shape and width show excellent quantitative agreement with the results of a simple model. (C) 1996 Optical Society of America