Stable 120-mW green output tunable over 2 THz by a second-harmonic generation process in a KTP crystal at room temperature

We report on 120-mW directly measured cw power at 532 nm from a tunable alp ha-distributed-feedback laser diode near 1.064 mu m frequency doubled in a KTP crystal operating room temperature inside a ring cavity. Our experiment al setup allows us to scan frequencies up to 2 THz in the green-light domai n and thus is extremely useful for iodine spectroscopy. We show good agreem ent between experimental results and theoretical predictions for the second -harmonic generation process. (C) 2000 Optical Society of America.