Patent ID: 9472922
Filing Date: 2016-10-18
CPC Classification: G01B,H01S

Claim Text:
1. A light source, comprising: a semiconductor gain device operable to provide light amplification; a wavelength selection element comprising a diffraction grating; and light re-directors; wherein the semiconductor gain device, the light re-directors and the diffraction grating are mutually arranged so that an optical resonator is established for light portions emitted by the gain device and diffracted by the diffraction grating; wherein the optical resonator is an external cavity laser resonator; wherein the light source comprises a direction variation device capable of varying a direction of light incident on the wavelength selection element to select a resonator radiation wavelength dependent on the angle of incidence of the light on the wavelength selection element, and wherein the direction variation device comprises at least one of a beam deflection arrangement with a movable element for deflecting the light; a portion of material capable of varying a direction of propagation of light propagating in the material by applying an electrical signal to the material.