Frequency stabilization via interference between transmitted and reflected lights from a reference cavity

Area of Science:

• Optics and Photonics
• Laser Physics
• Metrology

Background:

• Optical frequency stabilization is crucial for precision measurements.
• Existing methods often suffer from laser intensity and interferometer fluctuations.
• A wider capture range and higher sensitivity are desirable for practical applications.

Purpose of the Study:

• To develop a modulation-free optical frequency stabilization technique.
• To improve robustness against laser intensity and interferometer fluctuations.
• To expand the capture range of optical frequency locking.

Main Methods:

• Utilizing an interferometric effect between transmitted and reflected light from a reference cavity.
• Leveraging the robustness of reflected light against intensity fluctuations.
• Exploiting the expanded capture range property of transmitted light.

Main Results:

• Demonstrated robustness of the error signal against laser intensity fluctuations.
• Experimentally verified an expanded capture range up to twice the cavity's Free Spectral Range (FSR).
• Achieved high sensitivity to frequency fluctuations and robustness against interferometer fluctuations by combining both light properties.

Conclusions:

• The proposed modulation-free technique offers superior performance in optical frequency stabilization.
• The method provides enhanced robustness and an expanded capture range compared to previous techniques.
• This advancement has significant implications for precision optical systems and metrology.