Frequency stabilization of internal-mirror helium-neon lasers

Area of Science:

• Atomic, Molecular, and Optical Physics
• Laser Physics and Technology
• Metrology and Measurement Science

Background:

• Helium-neon (HeNe) lasers are widely used in scientific and industrial applications.
• Precise frequency control is crucial for many laser applications, including interferometry and spectroscopy.
• Existing frequency stabilization techniques can be complex or expensive.

Purpose of the Study:

• To describe a simple and inexpensive frequency stabilization system for a helium-neon two-mode laser.
• To present experimental validation of the stabilization system's performance.
• To achieve high-frequency stability for practical applications.

Main Methods:

• Utilizing a helium-neon laser with an internal mirror plasma tube operating in a two-mode configuration.
• Comparing the light intensities of the two longitudinal modes.
• Symmetrizing the mode frequencies around the neon emission line at the 3s(2)-2p(4) transition.

Main Results:

• Demonstrated a functional frequency stabilization system for a HeNe laser.
• Achieved frequency stabilization with a relative uncertainty of less than 1 part in 10(7).
• The system relies on a straightforward comparison of mode light intensities.

Conclusions:

• The described system offers a simple, cost-effective solution for high-precision helium-neon laser frequency stabilization.
• The method of comparing mode intensities provides a reliable way to lock laser frequency to the atomic transition.
• This technique is suitable for applications requiring stable laser frequencies without complex instrumentation.