01
Calibration prisms
Fused silica prisms, certified flat to lambda over twenty.
Halden Optics / Precision glass / Jena
Light, taken apart
We grind and polish optical glass to a few nanometres. The prism behind this page takes one white beam and shows you every colour inside it.
Scroll to split the light
Step 01 / One beam
White is a crowd.
What looks like a single colour is seven or seventy, travelling together. A clean piece of glass is the quickest way to tell them apart.
Step 02 / Refraction
Each colour bends its own way.
Short wavelengths slow down more inside the glass, so blue turns harder than red. The angle between them is set by the glass and the cut, so we control both.
Step 03 / The fan
Now you can read it.
Once the beam fans out you can measure each band. That is how a spectrometer works, and why a flaw in the glass shows up as a flaw in the answer.
Flat to a fraction of a wavelength.
-Visible range
-Fan angle
-Refractive index
-Colour bands
Instruments
Three product lines, each ground and inspected by the same small team.
02
Bench spectrometers
A compact bench unit with a replaceable prism block.
03
Custom glass
One-off cuts for labs that need an angle nobody sells.
Eleven people, one polishing hall.
Opticians, physicists and a retired clockmaker who still checks every edge by eye. We work in small runs and sign the test report ourselves.
D
Dr. Katrin VogelHead of optics
J
Jonas AlbrechtMaster optician
M
Mira SandovalTest and metrology
Need an angle nobody sells?
Send us the wavelength range and the tolerance. We will tell you what the glass can do.
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