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Stark effects in optically pumped CH(3)OH far infrared laser.

K P Koo, P C Claspy

|March 10, 2010

Summary

Investigating the Stark tuning of methanol (CH3OH) far-infrared (FIR) lasers reveals significant frequency shifts and amplitude modulation. These findings enhance FIR laser output, offering potential for improved spectroscopic applications.

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Area of Science:

Quantum Electronics
Molecular Spectroscopy
Laser Physics

Background:

Far-infrared (FIR) lasers, such as the 118.8-micrometer (µm) methanol (CH3OH) line, are crucial tools in spectroscopy.
The P(36) 9.4-µm carbon dioxide (CO2) laser is a common pump source for generating FIR laser emissions.
Understanding Stark tuning effects is essential for controlling and enhancing FIR laser properties.

Purpose of the Study:

To investigate the Stark tuning properties of the 118.8-µm CH3OH FIR laser line.
To analyze the impact of Stark fields on the absorption and emission characteristics of the CH3OH laser system.
To develop a theoretical model for predicting Stark tuning effects in FIR lasers.

Main Methods:

A rate equation approach was employed to derive a theoretical laser model.
Experimental measurements were conducted to observe Stark tuning effects.
Varying Stark electric fields were applied to the CH3OH medium.

Main Results:

Observed Stark tuning effects include frequency shifting of the CH3OH absorption line and the FIR laser line, as well as amplitude modulation of the FIR output.
Stark enhancement of the 118.8-µm FIR laser line by a factor of 3 was achieved with a Stark field of 180 V/cm due to frequency shifting of the CH3OH absorption line.
A frequency shift of approximately 7 MHz in the 118.8-µm FIR laser line was measured with a Stark field of 362 V/cm.

Conclusions:

Stark tuning provides an effective method for enhancing the output power of the 118.8-µm CH3OH FIR laser.
The observed amplitude modulation characteristics are consistent with Stark absorption modulation.
The study demonstrates the potential for precise control of FIR laser parameters through the application of Stark fields.

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