Patent ID: 9572218
Date: 2017-02-14
CPC Classifications: A62D,G01J,H01S,H05B

Claim:
1. A light source assembly, comprising: a semiconductor light emitter structured to emit light, the semiconductor light emitter comprising one from a group containing resonant-cavity light-emitting diodes, single-mode, polarization-locked semiconductor lasers, and super luminescent diodes, wherein the light has a peak wavelength and bandwidth in bands in the group comprising ultraviolet-, visible-, and infrared-emission bands; a driver circuit having a first input terminal, a second input terminal structured to receive a reference signal, and an output terminal, the driver circuit operative to supply a drive signal on the output terminal to excite light emissions from the semiconductor light emitter; a lens operative to receive the light and to collimate the light into substantially parallel light rays; a beamsplitter comprising a plate of optically transparent material having a first surface and a second surface, the beamsplitter positioned to capture and reflect a first portion of the light rays and transmit a remaining unreflected second portion of the light rays having a light power; a photodetector circuit having a photodetector operative to capture substantially the entire reflected first portion of the light rays in the active area and to convert the captured light rays to a sample signal; a thermally conductive support member that mounts the semiconductor light emitter and the photodetector to maintain them at substantially the same temperatures; a temperature sensor coupled to the thermally conductive support member and operative to produce a temperature signal representative of the temperature of the semiconductor light emitter and the photodetector; and a feedback control circuit having a first input terminal coupled to the temperature sensor, a second input terminal coupled to the photodetector circuit, and an output terminal coupled to the first terminal of the driver circuit, the feedback control circuit forming a feedback loop between the photodetector circuit and the first input terminal of the driver circuit and operative to provide a control signal on the output terminal to the first input terminal of the driver circuit and control the light power of the second portion of the light rays over an operative temperature range.