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Laser Safety Eyewear - Dielectric Coated Filters

Dielectric Coated Filters

The best of both worlds - light weight and high protection

LASERVISION's dielectrically coated reflective glass and plastic filters offer the best of both worlds, combining the light weight of plastic eyewear with the high optical densities and visible light transmission of mineral glass filters. Coated filters are produced by vapour deposition of dielectric interference layers onto a glass or plastic substrate. Individual dielectric layers must be applied to an accuracy of a few nanometers in order to precisely reflect the desired laser wavelength(s). As required in the BS EN 207 and BS EN 208 standards, the interference coatings completely block the intended laser wavelengths over a 30 degree range of incident angles. With the exception of the blocked laser wavelengths, nearly all other light passes through the filter without attenuation. This results in a filter with low coloration and high visible light transmission compared to broadband absorbing glass and plastic filters. This property of coated filters is extremely attractive in medical applications where good colour rendition is important.

The protection afforded by filters which absorb incident laser radiation tends to be limited by thermal processes, whereas coated filters reflect the light to provide higher damage thresholds. This allows for the use of coated, light weight plastic filters against high average and high peak power lasers.

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Dielectric Filters Main Laser Types Wavelengths Blocked
Type 23 Alexandrite, Ti:Sapphire
IR Diode (M-Rated)
750-850nm
Type 27 Excimer, Argon
Nd:YAG & Harmonics
Fibre (M-Rated)
180-532nm
1030-1100nm
Type 35 Nd:YAG, Fibre
Ho:YAG, CO2
(M-Rated)
1030-1100nm
2000-2200nm
5400nm
9000-11000nm
Type 37  Excimer, Argon
Nd:YAG & Harmonics
Fibre (M-Rated)
180-532nm
1030-1100nm 
Type 43  IR Diode  925-1010nm 
Type 44  Ti:Sapphire, IR Diode  780-860nm 
Type 60 Excimer
Nd:YAG (3H + 4H)
180-380nm
Type 62 IR Diode, Nd:YAG 808-1064nm
Type 73 IR Diode, Nd:YAG
Fibre, Er:YAG, CO2
950-1400nm
2780-3000nm
10600nm
Type 83 Nd:YAG (2H) 530-535nm
Type 92 Nd:YAG, Fibre, CO2 1040-1080nm
9000-11000nm
Type 93 Nd:YAG, CO2 1048-1064nm
9000-11000nm

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