Patent ID: 9151667
Filing Date: 2015-10-06
Classification: G01B,G01J,H01S

Abstract:
1. A system for stabilizing optical power of illumination provided by a wavelength-tunable laser, comprising: a laser diode, the laser diode configured to provide illumination along an illumination path; a laser controller communicatively coupled to the laser diode, the laser controller configured to adjust a wavelength of illumination emanating from the laser diode; a beam sampler, the beam sampler configured to receive illumination from the illumination path, the beam sampler further configured to direct a delivery portion of illumination received from the illumination path along a delivery path to a phase-shifting interferometer, the beam sampler further configured to direct a reference portion of illumination received from the illumination path along a reference path; a detector, the detector configured to receive a portion of the reference portion of illumination from the reference path; an amplitude controller communicatively coupled to the detector, the amplitude controller configured to receive information associated with optical power of the reference portion of illumination from the detector, the amplitude controller further configured to compare optical power of the reference portion of illumination and a selected optical power; and an optical amplitude modulator communicatively coupled to the amplitude controller, the optical amplitude modulator disposed along the illumination path, the optical amplitude modulator configured to adjust optical power of illumination received from a first portion of the illumination path utilizing information received from the amplitude controller associated with a comparison of the optical power of the reference portion of illumination and the selected optical power, the optical amplitude modulator further configured to transmit illumination having adjusted optical power along a second portion of the illumination path.