Patent ID: 6597710
Filing Date: 2003-07-22
Classification: H01S

Abstract:
A device for tuning the wavelength of a light in an external cavity laser comprising:an optically amplifying semiconductor chip including a first reflecting surface and an Anti-Reflection (AR) coated semiconductor chip facet; collimating means for collimating a light beam emitted from the optically amplifying semiconductor chip through the AR coated semiconductor chip facet; a diffraction grating on which at least a part of the light beam, emitted through the AR coated semiconductor chip facet, is incident and diffracted back to the optically amplifying semiconductor chip; a movable part on which the diffraction grating is arranged, wherein the wavelength of the light can be tuned in the external cavity laser by moving the movable part, wherein the movable part of the external cavity laser exhibits a rotational movement for positioning the diffraction grating in relation to an optical axis of the external cavity laser, the optical axis being defined by the center of the light beam propagating between the optically amplifying semiconductor chip and the diffraction grating, said movement being actuated by a magnetic force generated within an integral section of said movable part, said magnetic force being produced by a magnet interacting with a coil.