Low-loss adiabatic fiber-optic coupler for cryogenic photonics

Area of Science:

• Quantum optics
• Cryogenic engineering
• Optoelectronics

Background:

• Advancements in quantum light-matter systems and transducers necessitate precise cryogenic optical measurements.
• Existing methods face challenges with sensitivity and mechanical vibrations in low-temperature environments.

Purpose of the Study:

• To present a novel packaged fiber-optic coupler designed for operation in the millikelvin temperature range.
• To enable high-sensitivity measurements of photonic devices under cryogenic conditions.

Main Methods:

• Development and packaging of a fiber-optic coupler.
• Testing of coupling efficiency for telecom wavelength light down to the mK temperature range.
• Evaluation of the system's immunity to mechanical vibrations.

Main Results:

• Achieved a coupling efficiency exceeding 50% for telecom wavelength light.
• Demonstrated robust performance down to the millikelvin temperature range.
• Confirmed the method's insensitivity to mechanical vibrations common in cryogenic setups.

Conclusions:

• The developed fiber-optic coupler is suitable for sensitive cryogenic optical measurements.
• This technology supports the advancement of quantum light-matter coupled systems and quantum transducers.
• The vibration-immune design enhances measurement reliability in demanding cryogenic environments.