Posted in | Cryogenic Systems

The OptistatDry TLEX - Versatile Cryofree® Top Loading Cryostat

The Optistat™Dry TLEX model from Oxford Instruments provides a temperature controlled sample-in-exchange gas environment, making it the most versatile cryogen free or Cryofree® top loading cryostat, optimized for various spectroscopy experiments.

The OptistatDry Cryofree series of cryostats for spectroscopy helps to cool samples to helium temperatures without using liquid cryogens. It consists of a range of compact cryostats with optical access that is cooled by a closed cycle refrigerator.

These cryostats offer major benefits, such as running costs and ease-of-use. The systems allow electrical and optical measurements to be performed on the user’s samples. These form a part of Oxford Instruments superior performance Optistat series.

Exchange Gas Environment

The OptistatDry – TLEX model is perfect for samples that possess low thermal conductivity, including powder or liquid form. Samples for life science, biological, or chemistry experiments generally cannot be used in a vacuum environment.

In addition to its sample-in-exchange-gas environment, the OptistatDry provides all of the cooling that is required for the samples that are not suited for a vacuum environment.

Top Loading Capability

Regardless of the sample type, the OptistatDry - TLEX model can be used to increase sample throughput and reduce the time between experiments. Removing the sample rod while the cryostat is kept cold allows the user to switch from one sample to the next in a few minutes.

The user can leave the cryostat in situ on the optical bench while changing the sample, eliminating the need for time-consuming re-alignment of the user’s optical arrangement.

Key Features

The main features of the OptistatDry - TLEX model are as follows:

  • Fast sample change within five minutes through top loading probe
  • Broad sample temperature ranging between <4 and 300 K
  • Optimized optical access with f1 and a clear view with a diameter of 15 mm
  • Wide range of different sample holders - windows and wiring options enable the user to upgrade their system as experimental needs develop

Key Benefits

The main benefits of the OptistatDry TLEX model are as follows:

  • Ease of Use
    • Available options include water or air-cooled compressors; single phase electrical power allows the system to be easily installed in all standard laboratory environments
    • Liquid cryogens not required
  • Versatile
    • Can be interfaced with all kinds of optical benches; the feet match both metric (25 mm spacing) and Imperial (1 inch spacing)
    • Perfect for a broad range of spectroscopy applications - including FTIR, Raman, Photoluminescence, etc.
  • Optical excellence
    • Large clear optical access and f1 comes as standard
    • A broad range of various window materials are offered in order to match varied wavelengths; anti-reflection coatings, and wedged windows are also available
  • Upgradeable
    • A broad range of distinct windows, sample holders and wiring options allows to upgrade the system as users experimental needs increase
    • Designed with a modular philosophy that enables the cryostat to evolve with the user’s experiment, enabling the user to begin with a basic system. Later as experimental needs increase, the user can upgrade to additional functionality, such as, add different windows, sample holders, and extra wiring


The main areas of applications of the OptistatDry - TLEX model are as follows:

  • Photoluminescence - At low temperatures, spectral attributes are sharper and stronger, increasing the quantity of data available
  • UV/Visible spectroscopy - Experiments conducted at low temperatures expose the interaction between the electronic energy levels and vibrational modes in solids
  • Infrared spectroscopy - Measuring changes in interatomic vibrational modes as well as other phenomena, such as the energy gap in a superconductor below its transition temperature can be performed using low temperature IR spectroscopy
  • Raman spectroscopy - Lower temperatures result in narrower lines linked with the observed Raman excitations
  • Electrical properties - Electrical and optical measurements including I-V curves

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