Potassium Reference Cell Potassium Reference Cells

The Photonics Technologies Potassium Reference Spectroscopic cells are available with Pyrex or Quartz windows and with high purity Potassium filling.

The Potassium Reference Cells come in a range of sizes, styles, and window materials.

Please see the ‘options’ tab in the table below for more details

Double-side anti-reflective (AR) coated windows are only available on spectroscopic cells made from quartz, with quartz or fused silica windows.  The AR coating centred at 780nm has a wavelength range from 730 to 830 nm with a reflectance of less than 0.5%.

Pyrex vapour reference cells are not available with wedged windows, but Pyrex windows can be attached at an angle.

For cells in stock and available for immediate delivery, please click on the ‘delivery’ tab in the table below

Due to the filling material, these cells are classed as Dangerous Goods for carriage by Air. Please contact us for a quote with shipping to your specific location.

If you require a specific cell not listed, please contact us for more information.

Price on Application


Potassium Quartz Spectroscopy Cells
Description / Part NumberSC-K-(19x75-Q)-W+A
Diameter:19mm (2° wedge)
Optical Path Length:75mm internal length
Windows:Fused Silica (FRIT to body), 3.2mm thickness, 60/40 scratch/dig quality, λ/4 wave flatness
Window Type:Wedged, 11° angle against body
Potassium Pyrex Spectroscopy Cells
Description / Part NumberSC-K41-(26x50-P)
Diameter:26 mm
Optical Path Length:50mm internal length
Windows:Pyrex, 60/40 scratch/dig quality, λ/4 wave flatness
Window Type:Flat, fused to body


4 Weeks

In stock for immediate delivery:

Fused Silica K Spectroscopy Cell  SC-K-(19×75-Q)-W+A

Pyrex K Spectroscopy Cell  SC-K41-(26×50-P)


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