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Stark-tuned, far-infrared laser for high-frequency plasma diagnostics
Applied Optics
|August 25, 2010
Summary
A new Stark-tuned methanol (CH3OH) laser offers high power and frequency splitting for advanced plasma diagnostics. This optically pumped far-infrared laser achieves 100 mW output and 34 MHz splitting, exceeding standard techniques for thermonuclear fusion research.
Area of Science:
- Optics and Photonics
- Plasma Physics
- Quantum Electronics
Background:
- Far-infrared lasers are crucial for plasma diagnostics.
- Stark tuning offers precise frequency control.
- Methanol (CH3OH) lasers provide specific far-infrared wavelengths.
Purpose of the Study:
- To develop a high-power, Stark-tuned optically pumped far-infrared CH3OH laser.
- To achieve a well-separated Stark doublet for modulated interferometry.
- To enhance modulation frequencies for plasma diagnostics.
Main Methods:
- Construction of a Stark-tuned optically pumped far-infrared CH3OH laser.
- Operation at 119 microm wavelength.
- Application of high pump power (65 W) and electric fields (1 kV/cm).
Main Results:
- Achieved over 100 mW continuous wave (cw) output power.
- Observed a frequency splitting of 34 MHz due to the Stark doublet.
- Demonstrated a modulation frequency significantly higher than standard methods.
Conclusions:
- The developed laser is suitable for current modulated interferometers in large thermonuclear plasma devices.
- The high output power and frequency splitting enable advanced plasma measurements.
- This technology offers a substantial improvement in achievable modulation frequencies for fusion research.
