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Large optical depth frequency modulation spectroscopy.

C C Kwong, E A Chan, S A Aljunid

|November 6, 2019

Summary

This summary is machine-generated.

Frequency modulation spectroscopy can recover weak signals in dense atomic ensembles by increasing the modulation index. This technique reveals natural linewidth, enabling studies of cooperative emission in bulk atomic systems.

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Area of Science:

Atomic physics
Quantum optics
Spectroscopy

Background:

Band-resolved frequency modulation spectroscopy is standard for measuring weak signals in radiative ensembles.
High optical depth causes signal decay, limiting conventional spectroscopy's effectiveness.

Purpose of the Study:

To demonstrate a method for recovering spectroscopic signals in optically dense media.
To explore the application of enhanced frequency modulation spectroscopy for studying atomic ensembles.

Main Methods:

Implementing band-resolved frequency modulation spectroscopy with a larger modulation index.
Applying the technique to cesium vapor for spectroscopic analysis.

Main Results:

Signal recovery in optically dense media by increasing the modulation index.
Observed signal dominated by natural linewidth, irrespective of inhomogeneous broadening.
Successful implementation and exploration of spectroscopic features in cesium vapor.

Conclusions:

Enhanced frequency modulation spectroscopy enables signal recovery in challenging, optically dense environments.
The technique provides access to fundamental linewidth information.
Paves the way for investigating cooperative emission effects in bulk atomic ensembles.