The Omniplex: CS204-FMX-19OP is a top loading optical cryostat with the ARS manufactured DE-204 for high cooling power and fast cooldown. The helium vapor is particularly useful for cooling samples that do not conduct heat well.

The ARS Omniplex systems feature large optical access, quick sample change, fast initial cooldown (90 minutes to 20 K), and adjustable radiation baffles to optimize sample temperatures.

The Omniplex: CS204-FMX-19OP comes with 4 window ports and with warm and cold windows. A variety of options allow this system to be customized to fit the researcher's needs, including custom tail pieces, load-lock gate valves and low vibration interfaces.

The sample stick can use any of the standard ARS sample holders, as well as receive a second set of temperature control instrumentation for fine tuning of the sample temperature.


  • Optical
  • Electro-optical
  • Magneto-optical
  • UV, VIS, IR
  • FTIR
  • Raman spectroscopy
  • Electroluminescence
  • Photoluminescence
  • Deep-level transient spectroscopy (DLTS)
  • Resistivity
  • Hall probe experiments
  • Diamond anvil cell
  • Liquid samples
  • Non-optical
  • Thermal, electrical and magnetic susceptibility
  • Low vibration applications with bellows



Typical Configuration


Options & Upgrades

  • Cryogen free
  • Top loading sample in vapor, fast sample change
  • Welded stainless steel vacuum chamber
  • Multiple tail piece adaptations
  • Large, clear view optical windows (1.5" outer, 0.7" cold windows)
  • Large sample viewing angle for optical collection (F/1.9)
  • Fully customizable


  • Cold head (DE-204AF)
  • Compressor (ARS-4HW)
  • 2 helium hoses
  • Omniplex, sample in vapor vacuum chamber
  • Optical tail piece with 4 window ports
  • OFHC copper radiation shield
  • 2 high purity quartz windows
  • 2 sapphire cold windows
  • Instrumentation for temperature measurement and control:
    • 10 pin hermetic feedthrough
    • 50 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 electrical experiments
  • Temperature controller