Intracavity dual-frequency power locking for a high-stable NPRO laser

Area of Science:

• Optics and Photonics
• Laser Physics
• Metrology

Background:

• Laser wavelength stabilization is crucial for fundamental research and advanced technologies.
• Current advancements focus on increasing laser portability and reducing costs.
• High-stability lasers are essential for precision measurements and scientific discovery.

Purpose of the Study:

• To develop a simplified and cost-effective approach for laser frequency stabilization.
• To enhance the frequency stability of a non-planar ring oscillator laser at 1064 nm.
• To demonstrate a method without requiring an external frequency reference.

Main Methods:

• Stabilizing the beat signal power of a dual-frequency laser inside the cavity.
• Utilizing the direct mapping relationship between beat signal power and laser frequency.
• Implementing a well-packaged non-planar ring oscillator laser design.

Main Results:

• Achieved a 20-fold reduction in laser frequency noise.
• Demonstrated over 10 dB reduction in beat signal phase noise.
• Operated within the 0.1 mHz-10 Hz frequency range, compared to free-running conditions.

Conclusions:

• Established a simplified and cost-effective laser frequency stabilization technique.
• Provided new insights for extending laboratory-grade optical metrology.
• The method offers enhanced portability and reduced cost for high-stability lasers.