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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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CO(2) Laser with Simultaneous Active and Passive Q-Switching.

O M Stafsudd, O Ersoy, S Pizzica

|January 23, 2010

Summary

A saturating absorber gas, not mirror rotation, dictates the pulse characteristics of a carbon dioxide (CO2) laser. This finding holds true across various mirror speeds, simplifying laser pulse control.

Area of Science:

Optics and Photonics
Laser Physics

Background:

Carbon dioxide (CO2) lasers are widely used in various industrial and scientific applications.
Q-switching is a technique used to produce high-intensity laser pulses.
Understanding pulse dynamics is crucial for optimizing laser performance.

Purpose of the Study:

To investigate the influence of a saturable absorber gas on the pulse width and structure of a CO2 laser.
To compare the effect of a saturable absorber with a slowly rotating mirror Q-switch.
To develop a theoretical model for the observed phenomena.

Main Methods:

Experimental setup utilizing a CO2 laser with both saturable absorbing gas and slowly rotating mirror Q-switches.
Systematic variation of mirror rotation rates.

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Theoretical calculations assuming two-level systems for both the CO2 laser and the absorber.

Main Results:

The saturable absorber gas was found to be the primary determinant of pulse width and structure.
This control by the absorber was observed over a broad range of mirror rotation speeds.
Experimental findings were supported by theoretical calculations.

Conclusions:

Saturable absorbers offer significant control over CO2 laser pulse characteristics.
The choice of Q-switching method (absorber vs. rotating mirror) impacts pulse dynamics.
Theoretical modeling provides a framework for understanding these laser pulse behaviors.