Inventors:
Martin E. Banton - Fairport NY
Robert A. Lonis - Williamson NY
Assignee:
Xerox Corporation - Stamford CT
International Classification:
G02B 2610
Abstract:
A dynamic power control for an external cavity stabilized laser diode adapted for use with a Raster Output Scanner employing a photodiode to convert light emitted from the rear facet of the diode internal cavity to an electrical signal, and a comparator for comparing the light intensity signal with a reference signal and adjusting the drive current input to the diode to maintain diode output pwer constant. In a second embodiment, diode power is taken from the zero order beam at the external cavity transmissive wavelength selecting grating, in a third embodiment from the external cavity output beam, and in a fourth embodiment, from the zero order beam that passes through the holographic disc facets.