Optical Properties

Let there be light!

One key strengths of BOROFLOAT® glass is that it allows light to pass through freely without distortion. Due to the purity of its ingredients and unique material structure, our specialty float glass offers excellent light transmission in the visible wavelength range. Its high transparency in the near IR and UV range also means that BOROFLOAT® is the perfect specialty glass for high precision components and solutions used in the fields of optics, photonics and opto-electronics.

Key benefits:

Exceptionally high transparency
  • High transparency in visible and near IR & UV range of wavelengths
  • Outstanding visual quality and optical clarity
  • Low inherent fluorescence and solarisation tendency
Optical index of refraction
Wavelength λ (nm)
Refraction index n
435.8 1.48015
479.9 1.47676 (nF’)
546.1 1.47311(ne)
589.3 1.47133
643.8 1.46953 (nC’)
656.3 1.46916

Reference values, not guaranteed values.
Optical data
Abbe number (ve = (ne – 1) / (nF‘ – nC‘)) 65.41
Refraction index (nd587,6 nm)) 1.47140
Dispersion (nF – nC) 71.4 x 10-4
Stress-optical coefficient (K) 4.0 x 10-6 mm2 N-1

Average reference values, not guaranteed values.

Inherent fluorescence of BOROFLOAT® 33

Some materials have the ability to emit electromagnetic radiation after being activated by high frequency short-wave radiation. This property is referred to as fluorescence. It depends on the material’s purity and structural characteristics as well as the radiation’s excitation energy and excitation wavelength.
BOROFLOAT® 33 is a highly transparent glass with a much lower inherent fluorescence than soda-lime flat glass.
Trade Fairs & Events
Trade fair CIOE - China International Optoelectronic Exposition, Shenzhen, China, 01.09 - 03.09.2021