Patent ID: 7796673
Filing Date: 2010-09-14
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; and a grating/reflector assembly comprising a folding reflector and a Bragg grating element positioned at a fixed angle to the folding reflector, the Bragg grating element comprising a three-dimensional bulk of optical material having a Bragg grating recorded therein, the Bragg grating having a peak wavelength; 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 such that the second portion of light is received 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, and wherein rotation of the grating/reflector assembly continuously tunes the wavelength of light emitted by the light-emitting device.