VPF-100, 500, 800

LIQUID NITROGEN VARIABLE TEMPERATURE CRYOSTATS

The Janis VPF cryostat is an inexpensive liquid nitrogen cryostat offering operating temperatures from 65 K to 800 K. Simple to use and refill, the VPF system uses a thermal impedance displacer and built-in heater to provide variable temperature capability. Temperatures below
77 K are achieved using an optional pumping manifold. High temperature capability is provided using special sensors and heaters.

Access to the sample compartment is provided by a quick disconnect clamp. Samples are mounted in a 3" diameter vacuum space (2.5" for VPF-800) and can be connected with cryogenic-service wiring (single conductor or coaxial). The four-way optical sample chamber (with a numeric aperture of 1.0) can be preset for reflectance or transmission measurements. Standard windows are clear fused quartz offering transmission from the UV to near- IR regions. Optional window materials can be installed to span the far/ mid- IR, VUV, and x-ray regions for a variety of spectroscopic measurements.  An optional refill assembly permits refilling of the LN₂ reservoir without affecting the controlled temperature.

Typical applications for the VPF include spectroscopy (photoluminescence, FTIR, UV- visible), materials characterization (resistivity, Hall Effect), as well as low- temperature imaging, microscopy, and component testing. Low cost, light weight, and portability make the VPF the ideal cryostat for multipurpose laboratories, demonstrations, and integration with existing instrumentation. All VPF models (100, 500, and 800) are in stock for fast delivery to your site.  (Contact Janis for delivery times on our Model VPF-100-FTIR cryostat.)

Custom configurations may be fabricated to fit restricted spaces (such as in a magnet system or spectrometer) or to allow the insertion of very large samples (such as semiconductor wafers or "cold plates" to cool several samples at once).