High sensitivity intracavity stimulated emission pumping.

Area of Science:

• Atomic and Molecular Physics
• Laser Spectroscopy
• Quantum Optics

Background:

• Intracavity laser spectroscopy is a sensitive technique for measuring optical gain and absorption.
• Understanding stimulated emission pumping mechanisms is crucial for laser development and molecular spectroscopy.

Purpose of the Study:

• To measure small optical gains using an intracavity laser technique.
• To investigate the mechanisms governing intracavity stimulated emission pumping using iodine molecules.
• To determine the influence of collision processes and cavity mode properties on measurement sensitivity.

Main Methods:

• Employed an intracavity laser technique to measure optical gains.
• Utilized the iodine molecule as a probe for stimulated emission pumping.
• Observed and quantified optical gain for specific spectral lines (R(15), P(13), P(17) in the 43-26 band).
• Measured absorption from vibrational states nu'' = 6, 7, and 8.

Main Results:

• Successfully measured small optical gains in the investigated spectral lines.
• Quantified absorption from excited vibrational states of iodine.
• Demonstrated that collision-induced processes and random cavity mode coincidences are key factors affecting the sensitivity of the technique.

Conclusions:

• The intracavity laser technique is effective for measuring small optical gains.
• Iodine molecules serve as a suitable probe for studying stimulated emission pumping.
• Sensitivity in this technique is critically dependent on collisional effects and cavity mode characteristics.