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Optical Filters for UV Applications

All-Dielectric UV-Filters from 200 nm to VIS Range

Optics Balzers provides custom-tailored all-dielectric UV-filters from 200 nm to the VIS range. High transmission Bandpass filters, steep edge filters and various other filters are available on request. Blocking levels as low as OD5 can be achieved, predominantly by reflection with minimum absorption. These properties lead to superior irradiation resistance and excellent environmental stability.

All-Dielectric UV-Filters from 200 nm to VIS Range

Benefits

  • Wide range of filter types
  • Deep blocking by high reflectance, low absorption
  • High transmittance in the pass range
  • Longterm shift-free spectral performance
  • High environmental stability
  • Excellent irradiation resistance


Applications

Precise UV irradiance control and wavelength selection is required for many applications like forensic, industrial and medical UV-curing processes, UV-microscopy and contamination detection in microelectronics. Combined with fluorescent tracers well defined UV-light sources are also applied for industrial and automotive leak detection.

Technical Data

Wavelength from 200 nm to VIS range

Transmittance T > 80 – 95%
(depending on wavelength range)

Blocking OD3 – OD5
(according to requirements)

Reflectance R > 90 – 95%

Angle of Incidence standard 0°,
(different AOI on request)

Substrate fused silica

Dimensions standard size Ø 25 mm
thickness 3 mm
(other dimensions on request)

Parallelism < 3 arcmin

Surface Defects 5 / 3 x 0.1

Environmental Stability Temperature - 40 ... + 150 °C
Humidity up to 99%

Fig. 1:Bandpass filter examples with blocking OD3. Measured spectral transmittance for normal incidence.
Fig. 1:Bandpass filter examples with blocking OD3. Measured spectral transmittance for normal incidence.
Fig. 2: Long pass filter examples with OD3 blocking. Measured spectral transmittance for normal incidence.
Fig. 2: Long pass filter examples with OD3 blocking. Measured spectral transmittance for normal incidence.
Fig. 3: Bandpass filter examples with OD3 blocking. Measured spectral transmittance for normal incidence.
Fig. 3: Bandpass filter examples with OD3 blocking. Measured spectral transmittance for normal incidence.
Fig. 4: Short pass filter with ultra-broad blocking better than OD5. Measured spectral transmittance for normal incidence.
Fig. 4: Short pass filter with ultra-broad blocking better than OD5. Measured spectral transmittance for normal incidence.
Fig. 5: Measured spectral reflectance of a broad band mirror.
Fig. 6:Measured transmittance spectra for normal incidence. Example: High transmittance at 248 nm, Blocking OD3 with minimized absorption down to 200 nm.
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