Patent ID: 9671219
Date: 2017-06-06
CPC Classifications: G01B,G01J

Claim:
1. A method of reproducing nanometer scale and smaller measurements at a distance using two identical Fabry-Perot resonators, including a first Fabry-Perot resonator operating as a measuring Fabry-Perot resonator and a second Fabry-Perot resonator operating as a reproducing Fabry-Perot resonator, each of the Fabry-Perot resonators formed from two reflecting mirrors, the method comprising making an optical length of the measuring Fabry-Perot resonator identical to an optical length of the reproducing Fabry-Perot resonator, the method comprising: coupling light from a superluminescent diode into the measuring Fabry-Perot resonator; coupling the light transmitted from the measuring Fabry-Perot resonator to the reproducing Fabry-Perot resonator through a circulator which directs the intensity of the light back-reflected from the reproducing Fabry-Perot resonator to a photodiode which sums the intensities of each component of a wavelength comb transmitted by the measuring Fabry-Perot resonator; changing the optical length of the reproducing Fabry-Perot resonator while measuring the wavelength comb, and finding a narrowest and deepest voltage signal minimum of all components of said wavelength comb, and setting the optical length of the measuring Fabry-Perot resonator to be identical to the optical length of the reproducing Fabry-Perot resonator at the narrowest and deepest voltage signal minimum, locking the optical length of the measuring Fabry-Perot resonator to the optical length of the reproducing Fabry-Perot resonator.