Patent Number: 6,804,042

Title: Method for producing highly accurate frequency and FM of a laser

Abstract: A method and apparatus for accurately and precisely controlling the frequency (wavelength) and periodic frequency modulation of a laser are provided. An ADC (Analog to Digital Converter) is used to sample the output of a modified interferometer used as a delay line discriminator, and quadrature components of the sampled output are generated. An arctangent function (e.g., atan2) is applied to convert the quadrature components to a phase measure that is proportional to the laser frequency. Correlator circuits (e.g., cost-efficient correlator circuits) are provided to extract average frequency, modulation peak deviation, and modulation phase error signals. Control-loop feedback using the extracted signals is used to adjust the average frequency, modulation deviation, and modulation phase to respective set points.

Inventors: Mattox; Barry G. (Orlando, FL)

Assignee: Lockheed Martin Corporation

International Classification: G02F 1/29 (20060101); G02F 1/33 (20060101); H01L 21/00 (20060101); H01S 3/13 (20060101); H01S 3/10 (20060101); H01S 3/11 (20060101); H01S 3/117 (20060101); G02F 001/33 ()

Expiration Date: 10/12/2021