Multistage Cavity Housings: VH 6100

When cavity temperature control is paramount, our multi-stage vacuum housing for cylindrical and spherical cavities is the ideal solution.

Multiple isolated nesting shells surround the optical cavity, encapsulating it in a highly isothermal environment. With thermal time constants on the scale of days, your cavity remains impervious to hourly or daily lab temperature fluctuations. A carefully crafted shell design ensures that spurious blackbody radiation doesn’t directly impinge upon the cavity. Our multi-stage cavity vacuum housing provides the best performance – period – for  your optical atomic clock or spectroscopy research.

Get unsurpassed stability with the ultimate in thermal isolation

Performance & Specs

Frequency Drift < 15 kHz/day at zero crossing temperature, 1550 nm
Temperature Drift < 1 mK/°C
Temperature Control Range 5 – 50°C
Thermal Time Constant > 4 days
Achievable Pressure < 10-6 Torr
Viewports AR coated windows angled at 2° with respect to can axis
Fittings Stainless steel tee with two Conflat fittings for ion pump & valve
Temperature Control 6 thermoelectric heaters
Thermistors Six: 10 kΩ @ 25°C
Weight 50 kg


  • Maximum thermal and blackbody radiation shielding
  • Choice of 3 or 4 nested shells, depending on thermal insulation required
  • < 5 mK/°C temperature drift over a wide operating temperature range (5 – 50°C)
  • Thermal time constant of > 4 days

Engineering Diagram

Customization Options

  • Adaptation for spherical and cube cavities
  • Three or four stages of temperature control, higher upon request
  • Each cavity housing is built to order and fully customized to the application
  • TEC cooling option in place of heating