Patent ID: 8416830
Filing Date: 2013-04-09
Classification: H01S

Abstract:
1. A gain module comprising: a laser diode having spaced upstream and downstream facets defining an inner resonant cavity therebetween, the laser diode emitting broad spectrum light along a path; a one-piece slab of transparent material downstream from the laser diode; a feedback Bragg mirror recorded in the one-piece slab of material so as to define an external resonant cavity with the downstream facet, the feedback Bragg mirror extending in a plane perpendicular to an optical axis of the laser diode and being operative to provide a wavelength-dependent feedback into the external cavity capable of lasing an output light at a desired wavelength within the broad spectrum along the path; and an isolating Bragg mirror recorded in the slab downstream from and parallel to the feedback minor and configured re-reflect backreflected signal light originated downstream from the slab at a wavelength different from the desired wavelength.