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Optistat CF

A liquid helium cooled, top loading continuous flow (CF) cryostat enabling optical spectroscopy experiments that require:

Base temperature down to 2.3 K
Large 20 mm diameter sample space
Quick sample change via top loading, with sample in exchange gas
Generous f1 radial optical access with 4 radial windows and 1 axial window, with a wide range of window materials available
Operation in any orientation

The OptistatCF 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). 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.

Applications:

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.

SPM, STM, AFM : Low temperatures decrease the thermal noise from the probes and reduce atomic vibrations.

Download PDF datasheet – Optistat CF

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