Optistat Dry

The new Optistat Dry provides a temperature controlled sample in vacuum measurement environment within a Cryofree® or cryogen free cryostat. The system enables optical and electrical measurements to be carried out on your samples.

The Optistat Dry comprises a range of compact cryostats with optical access cooled by a closed cycle refrigerator. The system is capable of cooling samples to helium temperatures without the need for liquid cryogens. This provides significant benefits in terms of ease of use and running costs. Cooling of samples becomes a very straightforward, reliable process that requires no cryogenic infrastructure.

The Optistat Dry is designed to be:


Suitable for a wide range of experiments and different spectroscopy techniques (UV/VIS reflectivity and absorption, Raman scattering, FTIR, Fluorescence, Photoluminescence, Electrical transport measurements, Ultrafast spectroscopy, THz spectroscopy, Electroluminescence, etc.)
Designed to interface with all types of optical benches; the feet match both Imperial (1 inch spacing) and Metric (25 mm spacing)


Designed with a modular philosophy that allows the cryostat to evolve with your experiment, allowing you to start with a basic system and as experimental needs change, upgrade to additional functionalities at a later date, for example, add extra wiring, different sample holders and windows
A wide range of different sample holders, windows and wiring options enable you to upgrade your system as your experimental needs develop

Simple to use

Changing your sample through the unique load port is quick and simple; this eliminates the need to remove the cryostat from the optical bench and re-align your optics after each and every sample change
No liquid cryogens are required
Air or water-cooled compressors are available; single phase electrical power means the system is easy to install in all standard laboratory environments

Optical excellence

The Optistat Dry comes with f1 and large clear optical access as standard
The Optistat Dry has one window per optical access, a window in the OVC only; this makes the system particularly suitable for customers who need to minimise absorption losses
A wide range of different window materials are available to suit different wavelengths; wedged windows and anti-reflection coatings are also available
The cooling source for the cryostat is a two-stage Gifford McMahon (GM) refrigerator supplied by Sumitomo Heavy Industries (the RDK-101D cold head and HC-4 compressor). The sample cools through a direct conductive thermal path to the second stage of the refrigerator. The first stage of the refrigerator is used to cool a radiation shield which minimises the radiative heat load to the second stage of the refrigerator and to the sample region. 

The lower tail section of the cryostat (the window block) has been designed so that it is easy to remove and replace the sample mounting platform, once the cryostat has been warmed to room temperature (cooler switched off) and the cryostat vacuum let up to atmospheric pressure. The sample mounting platform has two main variants. The first is a simple nickel plated copper blade platform suited to optical experiments, with no or limited electrical measurement requirements. The second is a circuit board style platform (puck) suited to combined optical/electrical transport experiments.

Key specifications for the cryogen free Optistat™Dry

  • Wide sample temperature range from < 3 K to 300 K
  • Typical cool-down time from ambient to 10 K in 120 minutes
  • Water-cooled and air-cooled compressors available
  • Low vibration when used in conjunction with the optional stand, typically less than 10 micrometers RMS
  • Large sample space enables studies of samples with a wide range of different geometries and sizes
  • Low running costs
  • Optimised optical access with f1 and a clear view of 28 mm diameter allows a large illumination area for measurements involving the detection of low intensity light

Download PDF datasheet - Optistat Dry BLV
Download PDF application - OptistatDry magneto-optics applications

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