Laser for high frequency modulated interferometry
A Stark-tuned laser operating in the 119 micron line of CH[sub 3]OH has an output power of several tens of milliwatts at 30 Watts of pump power while exhibiting a doublet splitting of about ten MHz with the application of a Stark field on the order of 500 volts/cm. This output power allows for use of the laser in a multi-channel interferometer, while its high operating frequency permits the interferometer to measure rapid electron density changes in a pellet injected or otherwise fueled plasma such as encountered in magnetic fusion devices. The laser includes a long far-infrared (FIR) pyrex resonator tube disposed within a cylindrical water jacket and incorporating charged electrodes for applying the Stark field to a gas confined therein. With the electrodes located within the resonator tube, the resonator tube walls are cooled by a flowing coolant without electrical breakdown in the coolant liquid during application of the Stark field. Wall cooling allows for substantially increased FIR output powers. Provision is made for introducing a buffer gas into the resonator tube for increasing laser output power and its operating bandwidth. 10 figures.
- DOE Contract Number:
- AC02-76CH03073
- Assignee:
- Dept. of Energy, Washington, DC (United States)
- Patent Number(s):
- US 5034952; A
- Application Number:
- PPN: US 7-446345
- OSTI ID:
- 7079381
- Resource Relation:
- Patent File Date: 5 Dec 1989
- Country of Publication:
- United States
- Language:
- English
Similar Records
Laser for high frequency modulated interferometry
A Stark-tuned, far-infrared laser for high frequency plasma diagnostics
Related Subjects
INTERFEROMETERS
GAS LASERS
PLASMA DIAGNOSTICS
INTERFEROMETRY
THERMONUCLEAR DEVICES
ELECTRON DENSITY
FAR INFRARED RADIATION
MAGNETIC CONFINEMENT
CONFINEMENT
ELECTROMAGNETIC RADIATION
INFRARED RADIATION
LASERS
MEASURING INSTRUMENTS
PLASMA CONFINEMENT
RADIATIONS
700320* - Plasma Diagnostic Techniques & Instrumentation- (1992-)