laservision laser safety filter for laser safety eyewear
Absorbing materials are the common standard in order to block light of a defined wavelength range from the spectrum. As basic material special optic filter glass or plastics with special absorber dyes are mostly used. Absorption means that the light energy of the specified wavelength for which the filter is designed for is transformed to heat, when the beam hits the filter. Each of the different materials used for absorption filters, plastics and glass, does have advantages and disadvantages with respect to protection and comfort. Both features have to taken into consideration during the selection process of the right filter.
Whereas the blocking range of interference filters depends mostly on the design of the layer structure, the blocking range of commonly used absorption filters depends on mainly on the material properties of the substrate. Because in case of a laser hit most of the laser energy is reflected from an interference filter, the protection is highly independent from the chosen substrate. Therefore it is possible to achieve this this technology the high protection levels using plastic filters which have previously only been available with glass filter technology. Often also reflective coatings are applied as an add on to absorbing glass filters to optimize the protection range or to increase the protection level of the filter.
To be able to offer all laser operators the perfect laser safety eyewear, laservision develops and manufactures, among other standard spectacles more than hundred special filters with single-CE marking per year. This results mainly out of laservision's enormous experience with the handling of different materials, as plastics, mineral glasses or endowed special glasses, as well as out of the control of the technology for combining absorption- and reflection filters.