Mercury-vapor high-pressure short-arc discharge lamp, and method

Details Mercury-vapor high-pressure short-arc discharge lamp, and method Mercury-vapor high-pressure short-arc discharge lamp, and method

1995-08-22

1997-03-04

Berman, Jack I.

Radiant energy

Irradiation of objects or material

250504R, 313571, H01J 6186, H01J 6120, H01J 6140, C03C 1734

Patent

active

056082274

ABSTRACT:
To essentially eliminate short ultraviolet (UV) radiation from a mercury high-pressure short-arc discharge lamp, that is, wavelengths below the radiation band of 365 nm, the lamp includes a discharge vessel of quartz glass which is coated with a selectively reflective outer coating (2a) and, at the inside, with a selectively absorbing inner coating (2b). The outer coating (2a) is formed by a multi-layer interference reflection filter which preferentially reflects wavelengths between about 240 and 300 nm with a filter cut-off, corresponding to 50% transmission, in the wavelength region between about 290 and 330 nm. The inner coating (2b) is a titanium dioxide coating which, preferentially, absorbs radiation below about 250 nm, with a 50% transmission at about 240 nm. In accordance with a preferred feature of the invention, a radiation absorbing titanium dioxide/silicon dioxide mixed-layer coating (2c) is applied at the outside over the multi-layer interference reflection filter (2a). The outer absorbing coating preferentially absorbs radiation below about 280 nm. Preferably, the multi-layer interference reflection filter is formed by at least 8 alternating ZrO.sub.2 and SiO.sub.2 individual layers; all the coating layers preferably have thicknesses between about 30 and 50 nm.

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"Zeitschr.f.techn.Physik" (Journal of Technological Physics), vol. 11, pp. 77-379, article by Rompe and Thouret, Light Density of Mercury Discharge, etc. (1936).

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