Schott Ag

Hellma Materials Gmbh & Co. Kg

Schott Glas

Hellma Materials Gmbh

Wolfgang Triebel

Christian Muehlig

Regina Martin

Ute Natura

Gabriela Toepfer

Jochen Alkemper

Frank Coriand

Siegfried Kufert

Alfons Burkert

Joachim Bergmann

Sylvia Bark-Zollmann

Christian MÜHLIG

A method is described for quantitative determination of suitability of an optical material, especially alkali halide and alkaline earth halide single crystals, for optical components exposed to high energy densities, especially of pulsed laser light at wavelengths under 250 nm. In this procedure radiation-dependent transmission of the optical material is determined at ultraviolet wavelengths by fluorescence measurements for fluorescence induced by ultraviolet radiation at these ultraviolet wavelengths. This is accomplished by a method including determining an induced fluorescence maximum of a non-linear absorption process, measuring a slope (|dT/dH|) of a functional relationship representing the dependence of the radiation-dependent transmission on fluence (H) for the induced fluorescence and determining radiation-dependent transmissions from this slope for particular fluence values.

Method for quantitative determination of the suitability of crystals for optical components exposed to high energy densities, crystals graded in this way and uses thereof

The apparatus for extending or lengthening a laser pulse has a beam splitter. An incident laser pulse is split by the beam splitter into at least one first partial pulse and a second partial pulse. The first partial pulse is conducted through a delaying travel path section with a number of reflectors. The apparatus is characterized by a plurality of the variable delaying travel path sections which produce different length laser beam pulses from a single incident laser pulse.

Method and apparatus for changing the length of a laser pulse

The present invention refers to a method for the quantitative measurement of the pulse laser stability of synthetic fused silica, whereby this method avoids time-consuming and demanding measurements and saves material. First, the absorption of fused silica is measured for different energy densities, and a non-linear function &#x3b1;(H) is determined on the basis of the measured values. Second, the fused silica is subject to radiation with a higher energy density up to the point at which a constant absorption value is achieved. In the following, the absorption of the fused silica is measured at different energy densities, and a non-linear function &#x3b1;(H) is determined. The difference between the two non-linear functions indicates the increase of absorption that depends on the energy density.

Method for the quantitative measurement of the pulse laser stability of synthetic fused silica glass

The method tests the suitability of an optical material having a radiation-induced absorption, especially of an alkali or alkaline earth halide, for production of an optical element exposed to high-energy irradiation. The method includes pre-irradiating the optical material with laser radiation until rapid damage induced in the optical material with the laser radiation is saturated; subsequently measuring fluorescence of the optical material during and/or immediately after irradiating the optical material with excitation radiation and determining the non-intrinsic fluorescence and intrinsic fluorescence present in the measured fluorescence. Suitability may be preferably determined according to a ratio of the amount of non-intrinsic fluorescence to intrinsic fluorescence. A device for performing the method including a barrier device for blocking scattered excitation radiation is also provided.

Determining the suitability of an optical material for the production of optical elements, corresponding device, and use of said material

A method is described for quantitative determination of suitability of an optical material, especially alkali halide and alkaline earth halide single crystals, for optical components exposed to high energy densities, especially of pulsed laser light at wavelengths under 250 nm. In this procedure radiation-dependent transmission of the optical material is determined at ultraviolet wavelengths by fluorescence measurements for fluorescence induced by ultraviolet radiation at these ultraviolet wavelengths. This is accomplished by a method including determining an induced fluorescence maximum of a non-linear absorption process, measuring a slope (|dT/dH|) of a functional relationship representing the dependence of the radiation-dependent transmission on fluence (H) for the induced, fluorescence and determining radiation-dependent transmissions from this slope for particular fluence values.

Growing community of inventors

Jena-Cospeda, Germany

Wolfgang Triebel