A cryogenic magneto-optical device for long wavelength radiation

Area of Science:

• Physics
• Optical Engineering
• Materials Science

Background:

• Cryogenic systems are essential for sensitive radiation detection.
• Long-wavelength measurements require specialized optical setups and magnetic field compatibility.
• Proximity junction arrays are used in sensitive detectors but require stable, low-noise environments.

Purpose of the Study:

• To design and present a small-scale liquid helium immersion cryostat.
• To incorporate an innovative optical setup for long-wavelength radiation detection.
• To enable low-noise measurements under an applied magnetic field.

Main Methods:

• A multi-stage cryostat design with enhanced shielding was implemented.
• An external liquid nitrogen boiler was integrated to minimize bubbling.
• Optical and mechanical properties were calculated and optimized.
• Optical layout simulations were performed to refine the configuration.

Main Results:

• The cryostat is optimized for low-noise radiation measurements.
• The system operates effectively in the long-wavelength range (250 μm-2500 μm).
• The design accommodates applied magnetic fields for proximity junction array studies.

Conclusions:

• The presented liquid helium cryostat is a viable tool for advanced optical measurements.
• The innovative design addresses challenges in long-wavelength detection under magnetic fields.
• This system facilitates high-sensitivity research on proximity junction arrays.