Patent ID: 7298771
Filing Date: 2007-11-20
Classification: G02B,H01S

Abstract:
1. Apparatus for altering a characteristic of a light-emitting device, the apparatus comprising: a laser having a laser cavity and an emission spectrum; and a light-conditioning element comprising a three-dimensional Bragg grating element having a holographic Bragg grating recorded therein, wherein the light-conditioning element is adapted to receive laser light emitted by the laser, the emitted laser light having a first bandwidth, and wherein the laser operates above threshold in the absence of the feedback and the Bragg grating is adapted to redirect a portion of the received laser light, the redirected portion of the received laser light having a second bandwidth that is narrower than the first bandwidth, such that the redirected portion of the received laser light is fed back optically into the laser cavity as a narrow wavelength seed that causes a narrowing of the emission spectrum of the laser.