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Laser multipass system with interior cell configuration.

Jacek Borysow¹, Alexander Kostinski, Manfred Fink

¹Department of Physics, Michigan Technological University, Houghton, Michigan 49931, USA. jborysow@mtu.edu

|October 22, 2011

Summary

Restoring multipass laser system alignment after inserting a gas cell is possible with a simple mirror adjustment. This method preserves beam alignment and corrects aberrations, with potential microscopy applications.

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Area of Science:

Optics and Photonics
Laser Physics
Optical Engineering

Background:

Maintaining precise laser beam alignment is critical in multipass optical systems.
Gas cells are often integrated into laser systems for various applications, but can disrupt beam paths.

Purpose of the Study:

To investigate the feasibility of restoring multipass system alignment after gas cell insertion.
To develop a simple method for realigning laser multipass systems with an integrated gas cell.

Main Methods:

Utilized a laser multipass system with two spherical mirrors and a central gas cell.
Derived and applied a formula for adjusting mirror separation based on gas cell window properties (thickness and refractive index).
Validated the realignment method through ray-tracing computations and laboratory experiments.

Main Results:

A simple rearrangement of mirror separation by approximately 2d(1-1/n) restores laser beam alignment and tracing.
The derived adjustment formula accurately predicts the required mirror separation.
The method effectively compensates for optical path deviations introduced by the gas cell.

Conclusions:

It is possible to restore multipass system alignment after gas cell insertion using a straightforward mirror adjustment.
The proposed method is simple, effective, and validated experimentally.
The technique's ability to correct spherical aberrations suggests potential applications in optical microscopy.