Part of the Oxford Instruments Group


A magneto-optical Cryofree® superconducting magnet system.
Enables investigations of faraday effect, magneto circular dichroism and other high field optical effects.

Magneto-Optical Effects

Combining high magnetic fields with optical access for Raman magneto-spectroscopy and photoluminescence.


Characterisation of quantum dots and nano-devices for photonic applications.


Key Specifications


  • 7 T magnetic field in a compact geometry.
  • The sample can be changed while the system is cold.
  • Uses the highest specification magnet superconducting wire available on the market and advanced construction. techniques to ensure ultimate performance and reliability.
  • Wide range of experimental inserts to suit many applications.
  • Quick sample change via top-loading probe.
  • Excellent optical access in the horizontal plane, both parallel and perpendicular to the magnetic field.
  • Enables full sample rotation for measurements.
  • Sealed circulation loop reduces the risk of contamination and blockages.
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Optical Access for Cryogenic Experiments

For techniques requiring optical excitation prior to or during the measurement, access for light at the chosen frequency and polarisation is necessary. Choosing the right solution to provide low vibration, large open access, short working distances and a uniform optical path enables you to successfully characterise your device, down to the lowest cryogenic temperatures.

In addition to providing optical access both parallel and perpendicular to the magnetic field, appropriate windows must be fitted to permit radiation to pass through the sample space. The type of window material and surface coating selected will be determined by the wavelength and intensity of the radiation, the environmental temperature and whether or not the light is polarised.

For UV/Visible, Raman, FTIR, Fluorescence, Photoluminescence and THz applications, optical access is designed such that:

Whatever the requirements of your experiment may be, we have the solutions that will allow superior optical access for quick and efficient sample characterisation.

Options / Accessories

Window materials

A wide range of different window materials are available to tailor SpectromagPT to suit your particular application The material selected is determined by the wavelength and intensity of the radiation, the environmental temperature and whether or not beam polarization is required. The cold window needs to seal against superfluid helium which means it can sometimes be advantageous to use different materials for cold and warm windows. 

Fused quartz is generally suitable for optical and mid IR wavelengths while Calcium Floride and Zinc Selenide extend into the FIR region. Birefringent materials like Sapphire and crystalline Quartz open up to THz wavelengths when they are cold.

Window materials

The MercuryiTC is a versatile cryogenic environment controller. In its basic form it includes a single channel high-resolution (24 bit) temperature measurement circuit which supports all the standard cryogenic sensors (ruthenium oxide, cernox, silicon diodes, platinum, thermocouple and RhFe). With the constant voltage mode it enables reliable, accurate temperature measurement using negative temperature sensors (NTC) down to below 250 mK. The base unit enables PID loop configuration control of a single heater output up to 80W (40 V, 2 A).


The MercuryiPS is an intelligent fully configurable magnet power supply system. It enables automated control of a wide range of superconducting magnets, including NMR, high field, beamline and Vector Rotate magnet systems. MercuryiPS is a bi-polar, high-stability, four quadrant power supply with incorporated quench protection. It includes temperature control of the main high-power sense resistor to prevent output current drift. The MercuryiPS is fully controllable by remote command via TCP/IP, USB, RS232 or optional GPIB.

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