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Optistat®CF-V liquid helium (LHe) continuous flow optical spectroscopy cryostat
Sample in vacuum
The OptistatCF-V is a liquid helium cooled, top loading continuous flow (CF) cryostat enabling optical spectroscopy experiments that require:
- Base temperature down to 2.3 K
- Large 30 mm diameter sample space
- Minimum number of windows in the optical path, reducing reflective losses
- Generous f0.9 radial optical access with 4 radial windows and 1 axial window, with a wide range of window materials available
- Upper temperature of 500 K; having no cold windows enables the use of any window material above 300 K
- Operation in any orientation
The core "cold unit" of the OptistatCF-V, MicrostatHe and MicrostatHe Rectangular Tail is inter-changeable, enabling a modular set of optical cryostats for different experimental set-ups by swapping only the outer body.
Stock available now! Get your OptistatCF-V even faster - now available from stock for shipment within 3 weeks of order1. Use the Enquiries form or email us to reserve your system.
1subject to your choice of window material
Operation
The OptistatCF-V works on a continuous flow principle using an oil-free pump to draw liquid helium from a storage dewar, along a transfer tube, to the heat exchanger ("pull" mode). If the noise and vibration from the pump are undesirable then helium liquid can be pushed through the heat exchanger by pressurising the storage vessel ("push" mode). The sample is positioned on the sample holder in good thermal contact with the heat exchanger and surrounded by a vacuum.
Temperature control is achieved by a combination of manual helium flow control and power dissipated in an electrical heater, regulated using an ITC temperature controller.
The OptistatCF-V will also operate with liquid nitrogen (LN2) as coolant for measurements to 80 K.
To change the sample, the cryostat is warmed to room temperature, the vacuum released and the outer case and radiation shield removed.
Options
- Windows
- 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
- Pump options
- 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; this also extends the base temperature for the dynamic exchange gas version to 1.6 K
- Temperature control and options
- Choose either a compact benchtop, single-channel ITC601 or the flexible single- or 3-channel ITC503
- LHe transfer
- Standard TTL200 lightweight liquid helium transfer tube
- Choose a Low Loss transfer tube LLT600 to further minimise liquid helium consumption. An auto needle valve can be fitted to the LLT which allows the ITC503 temperature controller to optimise the helium flow rate
See also the OptistatCF for this cryostat with sample in exchange gas.
Software control
- Oxford Instruments electronics products are controllable through the OxSoft software using RS232, ISOBUS or GPIB interfaces
- LabVIEW virtual instruments are provided for Oxford Instruments electronics products to allow full PC-based control and monitoring. These can be integrated into a complete LabVIEW data acquisition system
The Optistat range of LHe and LN2 cryostats for optical spectroscopy
The OptistatCF-V (right), MicrostatHe (left) and MicrostatHe Rectangular Tail (centre) optical cryostats feature an inter-changeable "cold unit"
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OI Direct - Cryospares®
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