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Optistat CFV2

Oxford Instruments

Optistat CFV2 Helium cryostat 4 K, sample in vacuum
It is also a very versatile instrument as its tail is interchangeable between MicrostatHe2 and MicrostatHe2 Rectangular tail, ideal for microscopy and Magneto-optical Kerr effect experiments.

• Wide temperature range: from 3.2 K to 500 K
• Large sample space enabling studies of sample with a wide range of size and geometry
• Superb optical access (f/0.9) for measurements requiring light collection
• Optimised clear beam throughput (23 mm diameter aperture) allows a large illumination area for measurements involving the detection of low intensity light
• The most economical use of cryogens on the market: less than 0.45 L/h at 4.2 K using a Low Loss Transfer tube
• No cold windows enabling the use of any window material above 300 K
• Demountable radiation shield windows to maximise transmission intensity
• Compact size allowing easy integration into commercial spectrometers
• Electrical measurements via 10-pin electrical feed wire to heat exchanger
• Can be operated in pull mode (using a gas flow pump to pull the helium from a storage dewar to the sample space) or push mode (by pressurising the storage dewar)
  • Specifications
  • Systems Components/Options
  • Optional items
  • Window options
  • Pump options
  • Transfer lines
  • Applications
  • PDFs

Mode of operation

‘Pull’ mode

‘Push’ mode

Temperature range

2.3 - 500 K

4.2-500 K

Sample holder dimensions

20 mm wide x 50 mm long (optical sample holder version has a 12.5 mm aperture)

Maximum sample space (space within radiation shield)

30mm wide x 58mm long

Temperature stability

+/- 0.1 K (measured over 10 min period)

Cool down from ambient to 4.2 K

10 minutes

Cool down helium consumption from ambient to 4.2 K

<1.3 litres

Helium consumption at 4.2 K

<0.45 l/h (see Note 1)

Sample change time

1 hour

Cryostat weight

2 kg

Notes: 1. All specifications refer to the base model cryostat with two sets of Spectrosil B windows used with an LLT transfer tube and an ITC controller
• OptistatCF-V helium cryostat including cooling unit and OptistatCF-V tail set
• Sample holder
• Up to five sets of windows. (four radial; one axial). Each set includes two windows (radiation shield and outer case windows)
• Cryogen transfer tube: LLT 700
Mercury iTC temperature controller
• High vacuum pumping system
• Helium dewar
• Gas flow pump
• Gas flow controller
• Automated transfer tube allowing fully automated control across the entire temperature range
• Wiring and electrical connections to the sample
• A wide range of window materials can be fitted to the OptistatCF-V to meet specific spectroscopy applications
• Special windows with non-parallel faces and anti-reflection coatings are available
• Additional or replacement window flanges available via the Oxford Instruments Direct - Cryospares® on-line catalogue
• A simple oil-free vane pump GF4 is supplied for operation to 3.4 K
• Lower temperatures to 2.3 K require an EPS40 single stage rotary pump
• Oxford Instruments Low Loss Transfer tubes (LLT) use the cold gas exiting the cryostat to cool the shields surrounding the incoming liquid within the transfer tube. As a result, the consumption of our cryostats is the lowest on the market, dramatically reducing your running costs.

We can also offer an extra flexible transfer tube for those with restricted space in their labs. Please note that as this does not use the gas cooled mechanism, helium consumption will be higher than for the LLT range. However it will be well suited to those who need a lightweight and more flexible transfer tube.

• An auto needle valve can be fitted to the LLT which allows the temperature controller to optimise the helium flow rate

UV / Visible spectroscopy: Experiments at low temperatures reveal the interaction between the electronic energy levels and vibrational modes in solids.

Infrared spectroscopy : Low temperature IR spectroscopy is used to measure changes in interatomic vibrational modes as well as other phenomena such as the energy gap in a superconductor below its transition temperature.

Raman spectroscopy : Lower temperatures result in narrower lines associated with the observed Raman excitations.

Photoluminescence : At low temperatures, spectral features are sharper and more intense, thereby increasing the amount of information available.