GRATING FEEDBACK IN A 810-NM BROAD-AREA DIODE-LASER

Narrow linewidth, single spectral mode operation has been obtained in a high power, 810 nm broad-area diode laser in an extended cavity conf iguration with a grating as external reflector (grating feedback). For stable operation it was necessary to misalign the feedback slightly i n the plane of the laser junction. Characteristics of the thus obtaine d laser system are a linewidth below 5 MHz, an output intensity of abo ut 50% of the free running power, a large-scale tuning range of 15 nm and continuous scanning over 4 GHz. In the spatial domain, the laser r emains multimode and astigmatic. To show the practical applicability o f this system, saturated absorption of a krypton line is demonstrated.