The CS204I-FMX-4 provides the same high performance as our CS204I-FMX-1SS with its all stainless steel construction and welded stainless steel instrumentation skirt but provides a larger than standard sample space. The vacuum shroud comes standard with four window ports, and a fifth port can be added at the top.

The CS204I-FMX-4 is powered by our DE-204 series closed cycle cryocoolers. These liquid helium free cryostats use a pneumatically driven Gifford-McMahon cycle to cool the sample.


  • Large samples
  • Optical
  • Electro-optical
  • Raman
  • UV, VIS, IR
  • FTIR
  • Electroluminescence
  • Photoluminescence
  • Resistivity
  • Hall probe experiments
  • Diamond anvil cell
  • Deep-level transient spectroscopy (DLTS)
  • Thermal, electrical and magnetic susceptibility
  • Magneto-optical Kerr effect (MOKE)




Typical Configuration


Options & Upgrades

  • Cryogen free GM cryocooler
  • Welded stainless steel construction for better vacuum.
  • Large, clear view optical windows (1.5 in.)
  • Large sample viewing angle for optical collection (F/# = 1.25)
  • Fully customizable


  • Cold head (DE-204AI)
  • Compressor (ARS-4HW)
  • 2 helium hoses
  • Stainless steel vacuum shroud with 4 window ports for optical and electrical experiments (FMX-4)
  • Nickel plated OFHC copper radiation shield
  • 2 high purity quartz windows
  • Instrumentation for temperature measurement and control:
    • 10 pin hermetic feedthrough
    • 36 ohm thermofoil heater
    • Silicon diode sensor curve matched to (± 0.5 K) for control
    • Calibrated silicon diode sensor (±12 mK) with 4 in. free length for accurate sample measurement
  • Wiring for electrical experiments:
    • 10 pin feedthrough
    • 4 copper wires
  • Sample holder for optical and electrical experiments
  • Temperature controller