Patent ID: 7450862
Filing Date: 2008-11-11
Classification: H01S

Abstract:
1. A system comprising: an optical bench on which an optical system is installed, the optical system include a stray light insensitive detector system comprising: a detector chip which converts received light into an electrical signal; a detector substrate on which the detector chip is mounted; a baffle substrate positioned over the detector chip, the baffle substrate being non-transmissive and having a transmission port through which an optical signal is transmitted to the detector chip, the transmission port comprising a hole through the baffle substrate and extending parallel to a top surface of the optical bench to enable the detector chip to detect optical signals in the optical system; and a spacer between the detector substrate and the baffle substrate to space the baffle substrate away from the detector chip, the spacer being annular shaped with the detector chip being installed within a center region of the spacer on the detector substrate, the spacer being installed on the optical bench to project vertically from the bench with an axis of the center region extending parallel to the surface of the bench; wherein the optical signal propagates in free space above the optical bench before being directly received into the transmission port and propagating in free space through the port to the detector chip.