1.35 W OF STABLE SINGLE-FREQUENCY EMISSION FROM AN EXTERNAL-CAVITY TAPERED OSCILLATOR UTILIZING FIBER BRAGG GRATING FEEDBACK

An external-cavity tapered diode laser utilizing fiber Bragg grating f eedback was designed to oscillate on a single-longitudinal mode. Stabl e single-longitudinal mode operation was attained at powers as high as 1.35 W, The emission frequency tuned smoothly with current over the c avity's free spectral range of 6 GHz. The power in the lasing mode was >30 dB above the background amplified spontaneous emission and the si de-mode suppression ratio was >15 dB. No deterioration in the beam qua lity was measurable up to the highest output power. The coupling effic iency into a Gaussian resonator mode was >65% up to 1.35 W. (C) 1998 A merican Institute of Physics.