Highly sensitive frequency metrology for optical anisotropy measurements

Area of Science:

• Atomic, Molecular, and Optical Physics
• Metrology
• Condensed Matter Physics

Background:

• Traditional methods for measuring small optical anisotropies often rely on polarimetry.
• Detecting subtle effects like magnetoelectro-optical phenomena requires highly sensitive measurement techniques.

Purpose of the Study:

• To present a novel apparatus for measuring very small optical birefringences and anisotropies.
• To demonstrate the application of frequency metrology for high-sensitivity measurements of optical properties.
• To enable the detection of predicted magnetoelectro-optical effects in gases.

Main Methods:

• Utilized a high finesse resonant cavity to convert phase differences into measurable resonance frequency differences.
• Employed frequency metrology, a technique distinct from conventional polarimetry.
• Designed an apparatus capable of achieving high accuracy in frequency difference measurements.

Main Results:

• Achieved a sensitivity of delta n approximately = 2x10(-18) for birefringence measurements.
• Demonstrated the apparatus's capability to measure effects previously only theoretically predicted.
• The shot-noise limited sensitivity surpasses current state-of-the-art techniques.

Conclusions:

• Frequency metrology is a highly effective technique for measuring minute birefringences and optical anisotropies.
• The developed apparatus offers unprecedented sensitivity for optical measurements.
• This technique opens new avenues for exploring fundamental physics in gases and materials.