1.7 K Optical Cryostat

CRYOSTATION - Crossover Premium Series from Montana Instruments

Our low-vibration optical cryostat combines simple and fully automated cooling of the sample to 1.7 K in a closed helium cycle with benchtop design. The system can easily be installed on an optical stage and allows flexible free beam access at various points. 

Features
1.7K – 350K Temperature range
Integration of high-NA objectives
Push-button control with precise temperature control
> 20 mW cooling power
< 20 nm vibrations (peak-to-peak)

The closed cryogen-free cycle is realized through a Gifford-McMahon (GM) 2-step cryo-cooler. It leads a defined amount of helium gas to the cooling levels in the cold head. This closed-cycle technology saves money and long-term measurements must no longer be interrupted for time-consuming helium refills.

The cold head is driven by a helium compressor with varying speeds. Variable-Flow-Technology optimizes the power input to avoid energy waste and to extend the cold head lifetime.

The sample chamber, core of each optical experiment, is mounted directly on the optical stage. Different experimental setups can be installed around the instrument without blocking access to the sample or the view.  The system allows flexible mounting either at 45° or parallel to the hole pattern of the optical stage.

The Cryostation xp100 is optimized for the most sensitive experiments. Vibrating components of the cooling system are isolated in a separate case with adjusted dampers. This reduces the basic vibrations to a minimum without the need for complex external supports or special stages.
A proprietary sample exchange barrier thermally separates the cooling system from the sample stage. This way the sample stage is heated and cooled independently from the rest of the system. This results in most efficient cooling and quick loading cycles which enable high sample throughput.

The system is touchscreen-controlled with a proprietary user interface and control software. The sample space is exposed by lifting off the outer (vacuum) housing. Various sample mounting and position control options are available, including high-frequency feedthroughs to create photonic sensor stations. The system has two pre-installed high-frequency connections, 25 DC connections and 3 optical windows. All connections are already thermally coupled and additional thermometer connections are available. Further interfaces like RF, glass fiber, gas and additional DC connections are fed into the sample chamber through available side panels. 

Optical access is granted via several radial ports and one overhead port.  This enables a number of measurement options like transmission, side reflectance and overhead microscopy. The high-NA option with a short working distance provides a high collection efficiency. Windows can easily be swapped out to cover a range of wavelengths and experimental needs.

A proprietary liquid helium (LHE) creation and recycling system pumps low pressure LHE into the sample chamber platform. Patented vibration damping reduces vibrations to 20 nm max.

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