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 device. 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.
- Research Organization:
- Princeton Univ., NJ (USA). Plasma Physics Lab.
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (USA)
- DOE Contract Number:
- AC02-76CH03073
- Assignee:
- Dept. of Energy
- Patent Number(s):
- PATENTS-US-A7446345
- Application Number:
- ON: DE91011658; PPN: US 7-446345
- OSTI ID:
- 5694266
- Country of Publication:
- United States
- Language:
- English
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Laser for high frequency modulated interferometry
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ELECTRON DENSITY
INTERFEROMETRY
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PLASMA DIAGNOSTICS
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LASERS
PELLET INJECTION
RESONATORS
STARK EFFECT
CONFINEMENT
ELECTRONIC EQUIPMENT
EQUIPMENT
MEASURING INSTRUMENTS
PLASMA CONFINEMENT
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