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Intracavity gain detection: example I2, Br2.

K A Truesdell¹, R A Keller

¹University of California, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

|January 15, 1983

Summary

This study demonstrates a sensitive method for detecting minute optical gains using a continuous-wave dye laser. The technique successfully measured low gain values on specific transitions in optically pumped bromine (Br2).

Area of Science:

Atomic and Molecular Physics
Laser Spectroscopy
Quantum Optics

Background:

Measuring small optical gains is crucial for understanding laser dynamics and material properties.
Continuous-wave (cw) dye lasers offer tunable gain media suitable for sensitive measurements.
Spatial hole burning in laser cavities can enhance sensitivity near the lasing threshold.

Purpose of the Study:

To develop and demonstrate a sensitive technique for detecting low optical gains.
To measure optical gain on specific transitions in optically pumped bromine (Br2).
To investigate the utility of a cw dye laser operating slightly above threshold for gain measurements.

Main Methods:

Placing the gain medium (Br2) inside the cavity of a cw dye laser.

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Operating the laser slightly above the lasing threshold.

Utilizing the phenomenon of moderate spatial hole burning to enhance sensitivity.

Measuring gain on the 40' --> 6", 7", and 8" transitions.

Main Results:

Detection of optical gains as low as 2 x 10^-5.
Successful quantification of gain on the specified Br2 transitions.
Demonstration of the technique's high sensitivity.

Conclusions:

The described method provides a highly sensitive approach for measuring small optical gains.
This technique is effective for characterizing gain media, such as optically pumped Br2.
The use of a cw dye laser near threshold is a viable strategy for sensitive gain spectroscopy.