How is the transmittance of optical glass measured?The transmittance of optical glass is measured using double beam spectral photometers from the company Perkin Elmer with special modifications. The standard setup enables to measure within a wavelength region from 250 nm up to 2500 nm. The measurement accuracy over the complete spectrum is about ±0.5%.
Do low index glasses show high transmittance?As a general trend lowest refractive index glasses show high transmittance far down to short wavelengths in the UV. Going to higher index glasses the UV absorption edge moves closer to the visible range. For highest index glass and larger thickness the absorption edge already reaches into the visible range.
Which optical glasses have a good transmittance at 365 nm?Optical glasses with excellent homogeneity and transmittance at 365 nm are for example FK5 HT, LLF1 HT and LF5 HHT with transmittance >99% at 10 mm thickness . Fused silica exhibits an excellent transmittance (98%) down to 193 nm . The transmittance of CaF2 crystals is >99% at 157 nm wavelength .
Do optical glasses have a high transmittance range?Optical glasses are optimized to provide excellent transmittance throughout the total visible range from 400 to 800 nm. Usually the transmittance range spreads also into the near UV and IR regions. As a general trend lowest refractive index glasses show high transmittance far down to short wavelengths in the UV.
How does Schott achieve the best internal transmittance of melted glasses?SCHOTT attempts to achieve the best possible internal transmittance. However, due to cost and availability constraints, some deviations in the purity of the raw materials must be accepted. SCHOTT maintains minimum standards for the resulting deviations in internal transmission of melted glass
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The transmittance of optical glass is measured using double beam spectral photometers from the company Perkin Elmer with special modifications. The standard setup enables to measure within a wavelength region from 250 nm up to 2500 nm. The measurement accuracy over the complete spectrum is about ±0.5%.
As a general trend lowest refractive index glasses show high transmittance far down to short wavelengths in the UV. Going to higher index glasses the UV absorption edge moves closer to the visible range. For highest index glass and larger thickness the absorption edge already reaches into the visible range.
Optical glasses with excellent homogeneity and transmittance at 365 nm are for example FK5 HT, LLF1 HT and LF5 HHT with transmittance >99% at 10 mm thickness . Fused silica exhibits an excellent transmittance (98%) down to 193 nm . The transmittance of CaF2 crystals is >99% at 157 nm wavelength .
Optical glasses are optimized to provide excellent transmittance throughout the total visible range from 400 to 800 nm. Usually the transmittance range spreads also into the near UV and IR regions. As a general trend lowest refractive index glasses show high transmittance far down to short wavelengths in the UV.
SCHOTT attempts to achieve the best possible internal transmittance. However, due to cost and availability constraints, some deviations in the purity of the raw materials must be accepted. SCHOTT maintains minimum standards for the resulting deviations in internal transmission of melted glasses.
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