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Raman response function of atmospheric air.

Aleksei M Zheltikov¹

¹Physics Department, International Laser Center. M.V. Lomonosov Moscow State University, Voro'evy gory, 119992 Moscow, Russia. zheltikov@phys.msu.ru

|July 17, 2007

Summary

A new model analyzes the full Raman response of gases, revealing that molecular rotations and vibrations significantly impact optical nonlinearity in atmospheric air, especially with short laser pulses or high temperatures.

Area of Science:

Physics
Physical Chemistry
Optics

Background:

Understanding the optical nonlinearity of atmospheric air is crucial for laser-matter interactions.
The Raman response function, which describes how molecules interact with light, is complex and influenced by molecular motions.

Purpose of the Study:

To develop and apply a comprehensive model for the Raman response function of gas mixtures.
To investigate the influence of molecular rotational and vibrational motions on the retarded optical nonlinearity of atmospheric air.

Main Methods:

Development of a theoretical model for the full Raman response function.
Application of the model to atmospheric air under various conditions (laser pulse characteristics, gas temperature).

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Main Results:

Both rotational and vibrational molecular motions significantly contribute to the Raman response of atmospheric air.
The interplay between rotational and vibrational contributions is sensitive to gas temperature and laser pulse temporal shape.
This significantly affects the retarded optical nonlinearity.

Conclusions:

The presented model provides a detailed understanding of Raman response in gas mixtures.
Accurate modeling of optical nonlinearity in atmospheric air requires considering both rotational and vibrational molecular dynamics.
Gas temperature and laser pulse characteristics are key parameters controlling the nonlinear optical response.