Materion Balzers Optics
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Laser Safety Filters

Safety Filters and Beamsplitters for Ophthalmic Therapy

In ophthalmology instruments, laser safety filters block the therapy laser with high optical density, while showing a high transmittance for the image of the patient’s eye background. A sophisticated filter design with narrow blockband and balanced transmission level over the full visible range optimizes color rendering. The beamsplitter controls transmittance and reflectance for both therapy and target laser. The hard-coated filters are longterm stable and available in flexible dimensions.

Safety Filters and Beamsplitters for Ophthalmic Therapy

Benefits

  • Selective blocking of laser wavelengths
  • High transmittance > 90% in passband
  • Longterm shift-free spectral performance
  • High environmental stability
  • Wide flexibility in filter size


Applications

  • Ophthalmic therapy

Technical Data

Wavelength 532 nm, 561nm, 659nm
(other wavelengths on request)

Blocking OD5 /OD6

Transmittance Tave > 90% in passband

Angle of Incidence standard 0°
different AOI on request

Substrate fused silica or BK7

Dimensions on request

Parallelism < 3 arcmin

Surface Defects 5 / 3 x 0.1

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

Application Ophthalmologic Surgery & Schematic of Ophthalmic Therapy
Fig. 1: Measured spectral transmittance
Fig. 2: Measured spectral transmittance
Fig. 3: Measured spectral transmittance, blockband OD3
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