Xenon short arc discharge lamp
AssigneeW. C. Heraeus GmbH
InventorsManfred Neiger, Reiner Hoppstock, Bernd Kleiner
Life of this patent
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Abstract
A xenon short arc discharge lamp has a lamp bulb (1) of quartz glass, into which two rod-shaped electrodes (4, 5) protrude, the spacing of which is shorter than the diameter of the shaft (8) of the cathode (5); the cathode (5) is provided with a conical, obtuse tip (9). By doping with a metal halide, such as thallium iodide, the spectral radiant intensity per unit area in the plasma zone immediately in front of the cathode (5) is increased substantially compared with an undoped xenon short arc discharge lamp, and as a result of a flow-controlled tungsten-halogen cycle process, a stabilized cathode spot operation is attained, and the inner wall of the lamp bulb (1) remains free of tungsten deposits.
Claims16
A xenon short arc discharge lamp comprising
- a high-pressure-proof bulb (1), which, at least in a transparent zone thereof, comprises quartz glass,
- two opposed rod-shaped electrodes (4, 5) located on a common axis (3) protruding into the bulb, of which the anode (4) has a larger diameter than the cathode (5),
- a xenon filling in said bulb, at a pressure of at least one atmosphere or bar in the non-operating state, thereby providing rapid approximation of maximum final light output,
- said electrodes (4, 5) being spaced from one another by a distance which is shorter than the diameter of the shaft (8) of the cathode (5), thereby approximating a punctiform light source,
- wherein
- the tip of the cathode (5) is at least partially conical, thereby minimizing tip melting and disintegration, and
- the lamp includes at least one metal halide as a doping substance, thereby constricting arc size and increasing continuum emission radiant intensity.
A xenon short arc continuous-wave-laser-pumping light source comprising
- a high-pressure-proof bulb (1), which, at least in a transparent zone thereof, comprises quartz glass,
- two opposed rod-shaped electrodes (4, 5) located on a common axis (3) protruding into the bulb, of which the anode (4) has a larger diameter than the cathode (5),
- a xenon filling inn said bulb, at a pressure of at least one atmosphere or bar in the non-operating state, thereby providing rapid approximation of maximum final light output,
- said electrodes (4, 5) being spaced from one another by a distance which is shorter than the diameter of the shaft (8) of the cathode (5), thereby approximating a punctiform light source,
- wherein
- the tip of the cathode (5) is at least partially conical, thereby minimizing tip melting and disintegration, and
- the lamp includes at least one metal halide as a doping substance, thereby constricting arc size and increasing continuum emission radiant intensity.
Dependencies are inferred from the claim text.