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 Title: |
US4798467:
Heterodyne laser instantaneous frequency measurement system
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Wyeth, Richard W.; Livermore, CA
Johnson, Michael A.; Pleasanton, CA
Globig, Michael A.; Livermore, CA
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| Assignee: |
The United States Department of Energy, Washington, DC
other patents from UNITED STATES OF AMERICA, DEPARTMENT OF ENERGY (597195) (approx. 6,712)
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| Published / Filed: |
1989-01-17
/ 1986-09-24
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| Application Number: |
US1986000911023
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| IPC Code: |
Advanced:
B01D 59/34;
G01J 9/00;
G01J 9/04;
G01M 11/00;
Core:
B01D 59/00;
more...
IPC-7:
G01B 9/02;
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| U.S. Class: |
Current:
356/477;
372/032;
Original:
356/349;
372/032;
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| Field of Search: |
356/349,346,351
372/032
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| Government Interest: |
FIELD OF THE INVENTION
The United States Government has rights in this invention pursuant to Contract No. W-7405-ENG-48 between the United States Department of Energy and the University of Californiz for the operation of Lawrence Livermore National Laboratory.
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| Priority Number: |
| 1986-09-24 |
US1986000911023 |
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| Abstract: |
A heterodyne laser instantaneous frequency measurement system is disclosed. The system utilizes heterodyning of a pulsed laser beam with a continuous wave laser beam to form a beat signal. The beat signal is processed by a controller or computer which determines both the average frequency of the laser pulse and any changes or chirp of th frequency during the pulse.
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| Attorney, Agent or Firm: |
Simpson, Jr., P. Martin ;
Carnahan, L. E. ;
Hightower, Judson R. ;
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| Primary / Asst. Examiners: |
Laroche, Eugene R.; Ham, Seung
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Family: |
Show 13 known family members
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First Claim:
Show all 8 claims |
What is claimed is:
1. A laser beam frequency diagnostic system comprising:
- a first pulsed laser for generating a first short time duration pulsed laser beam having a pulse length duration of approximately 10-100 nanoseconds, the instantaneous frequency of which is to be determined,
- a second reference laser for generating a second laser beam having a predetermined frequency,
- means for heterodyning said first and second laser beams to form a beat signal representative of the difference between said first and second frequencies,
- means for processing said beat signal to determine the instantaneous frequency of said first laser beam,
- means for normalizing said beat signal,
- means for determining the relative phase between said beat signal and an assumed constant frequency average beat signal, and
- means for determining the derivative of said relative phase versus time.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 27 U.S. patent(s) that reference this one
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| Foreign References: |
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| Other Abstract Info: |
DERABS G88-100469
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| Other References: |
Burghardt et al., "Beat frequency . . . 80-GHz Band", Applied Phys. Lett. vol. 35, No. 7, Oct. 1979, pp. 498-500.
(3 pages)
Cited by 4 patents
DeGraauw et al., "A Single-sideband Optical Balanced Mixed", Optics Communications, vol. 14, No. 2, Jun. 1975, pp. 276-279.
(4 pages)
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