Apparatus for controlling the scan width of a scanning laser beam
Abstract
Swept-wavelength lasers are often used in absorption spectroscopy applications. In experiments where high accuracy is required, it is desirable to continuously monitor and control the range of wavelengths scanned (the scan width). A system has been demonstrated whereby the scan width of a swept ring-dye laser, or semiconductor diode laser, can be measured and controlled in real-time with a resolution better than 0.1%. Scan linearity, or conformity to a nonlinear scan waveform, can be measured and controlled. The system of the invention consists of a Fabry-Perot interferometer, three CAMAC interface modules, and a microcomputer running a simple analysis and proportional-integral control algorithm. With additional modules, multiple lasers can be simultaneously controlled. The invention also includes an embodiment implemented on an ordinary PC with a multifunction plug-in board.
- Inventors:
-
- Livermore, CA
- Issue Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- OSTI Identifier:
- 870656
- Patent Number(s):
- 5568255
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- DOE Contract Number:
- W-7405-ENG-48
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- apparatus; controlling; scan; width; scanning; laser; beam; swept-wavelength; lasers; absorption; spectroscopy; applications; experiments; accuracy; required; desirable; continuously; monitor; control; range; wavelengths; scanned; demonstrated; whereby; swept; ring-dye; semiconductor; diode; measured; controlled; real-time; resolution; linearity; conformity; nonlinear; waveform; consists; fabry-perot; interferometer; camac; interface; modules; microcomputer; running; simple; analysis; proportional-integral; algorithm; additional; multiple; simultaneously; embodiment; implemented; ordinary; pc; multifunction; plug-in; board; wavelength laser; fabry-perot interferometer; control algorithm; dye laser; laser beam; diode laser; semiconductor diode; scan line; scanning laser; multiple laser; interface module; absorption spectroscopy; spectroscopy applications; multiple lasers; wavelength lasers; continuously monitor; /356/372/
Citation Formats
Johnson, Gary W. Apparatus for controlling the scan width of a scanning laser beam. United States: N. p., 1996.
Web.
Johnson, Gary W. Apparatus for controlling the scan width of a scanning laser beam. United States.
Johnson, Gary W. Mon .
"Apparatus for controlling the scan width of a scanning laser beam". United States. https://www.osti.gov/servlets/purl/870656.
@article{osti_870656,
title = {Apparatus for controlling the scan width of a scanning laser beam},
author = {Johnson, Gary W},
abstractNote = {Swept-wavelength lasers are often used in absorption spectroscopy applications. In experiments where high accuracy is required, it is desirable to continuously monitor and control the range of wavelengths scanned (the scan width). A system has been demonstrated whereby the scan width of a swept ring-dye laser, or semiconductor diode laser, can be measured and controlled in real-time with a resolution better than 0.1%. Scan linearity, or conformity to a nonlinear scan waveform, can be measured and controlled. The system of the invention consists of a Fabry-Perot interferometer, three CAMAC interface modules, and a microcomputer running a simple analysis and proportional-integral control algorithm. With additional modules, multiple lasers can be simultaneously controlled. The invention also includes an embodiment implemented on an ordinary PC with a multifunction plug-in board.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 1996},
month = {Mon Jan 01 00:00:00 EST 1996}
}
Works referenced in this record:
Direct optical measurement of sodium hyperfine structure using a cw dye laser and an atomic beam
journal, April 1973
- Schuda, F.; Hercher, M.; Stroud, C. R.
- Applied Physics Letters, Vol. 22, Issue 8