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Intermode beat stabilized laser with frequency pulling.

S Yokoyama, T Araki, N Suzuki

|September 24, 2010

Summary

A new frequency-stabilized two-mode Helium-Neon (He-Ne) laser was developed using frequency pulling for enhanced stability. This laser achieves excellent frequency stability for both oscillation and beat frequency, outperforming Zeeman lasers.

Area of Science:

Laser Physics
Optical Engineering
Metrology

Background:

Frequency stabilization is crucial for precision measurements.
Two-mode lasers offer unique properties for frequency control.
Helium-Neon (He-Ne) lasers are widely used in scientific applications.

Purpose of the Study:

To develop a frequency-stabilized two-mode He-Ne laser.
To utilize the frequency pulling effect for laser stabilization.
To achieve superior frequency stability and polarization orthogonality.

Main Methods:

Employed a 25-cm cavity length for the He-Ne laser.
Utilized the frequency pulling phenomenon where laser modes align with the gain curve center.
Implemented a microwave mixer to detect intermode beat frequency changes.

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Controlled longitudinal mode positions by managing beat frequency variations.

Main Results:

Achieved an intermode beat frequency of approximately 600 MHz.
Demonstrated periodic beat frequency changes of hundreds of kilohertz due to cavity expansion.
Attained excellent frequency stability: 10⁻¹⁰ for laser oscillation and 10⁻⁶ for beat frequency.
Observed superior polarization orthogonality compared to Zeeman lasers.

Conclusions:

The frequency pulling effect is an effective method for stabilizing two-mode He-Ne lasers.
The developed laser system exhibits high frequency stability and excellent polarization properties.
This technology has potential applications in precision measurement and optical systems.