Patent ID: 7397837
Filing Date: 2008-07-08
Classification: G02B,H01S

Abstract:
1. Apparatus for altering a characteristic of a light-emitting device, the apparatus comprising: a light-emitting device having a gain medium; a folding reflector; a retro-reflector; a Bragg grating element having a peak wavelength; and rotation means for rotating the Bragg grating element and folding reflector, wherein the Bragg grating element receives a first portion of light emitted by the light-emitting device and redirects a second portion of light that is less than the first portion at an angle onto the folding reflector, the folding reflector redirects the second portion of light along a path to the retro-reflector, and the retro-reflector reflects the second portion of redirected light back along the path into the gain medium of the light-emitting device, thus causing the light-emitting device to operate at the peak wavelength of the Bragg grating element, and wherein rotation of the Bragg grating element and folding reflector continuously tunes the wavelength of light emitted by the light-emitting device.