Laser multipass system with interior cell configuration.

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.