TUNABLE COUPLED-CAVITY WAVE-GUIDE LASER AT ROOM-TEMPERATURE IN ND-DIFFUSED TI-LINBO3

We report on a Y-junction channel waveguide laser, operating at room temperature, in Nd-diffused Ti:LiNbO3. Pumping was performed with a cw Ti:Al2O3 laser operating at 816 nm. With feedback provided only by the polished end faces of the device, a cw lasing threshold of similar to 39-mW launched pump power was obtained, with a slope efficiency of similar to 35%. Using 95% reflectivity mirrors at the waveguide ends, we reduced the lasing threshold to similar to 4 mW, with a slope efficiency of similar to 2.6%. Tuning of the lasing signal over a range of 2.3 Mm around a center wavelength of 1092.7 nm was demonstrated, with a monolithically integrated phase modulator.