Ldt-gmbh & Co. Laser-display-technologie Kg

Carl Zeiss Jena Gmbh

Jenoptik Aktiengesellschaft

Juergen Kraenert

Christhard Deter

Enrico Geissler

Klaus Hiller

Axel Krause

Richard Wallenstein

Wolfgang Vogel

Siegfried Kufert

Frank Goepfert

Wolfram Biehlig

Thoralf Springer

Joerg Wunderlich

Holger Mueller

Holger Kuehn

Martin Enenkel

An illumination device for a light modulated projector includes a first and a second color wheel. A first filter surface of the first color wheel comprises at least three first surface sections arranged one behind the other, which protrude into an illumination beam path of the illumination device successively on rotation and in each case convey illumination radiation of a different partial range of the visible wavelength range. At least one of the first surface sections of the first filter surface conveys illumination radiation from the infrared range. A second filter surface of the second color wheel comprises a first surface segment which only conveys illumination radiation from the visible wavelength range and a second surface segment which only conveys illumination radiation from the infrared range. The first and second surface segments protrude into the illumination beam path successively on rotation.

Illumination device for a projector comprising a light modulator

A mode-synchronized solid-state laser comprising a laser medium inside a laser resonator which is formed by a resonator mirror and an output coupling mirror and which is folded by at least one concave folding mirror, with a saturable absorber inside the laser resonator and with at least one laser pump source whose pump beam pumps the laser medium, wherein the elongated resonator length L is a function of the pulse repetition frequency and the latter is determined by a distance between the resonator mirror and the output coupling mirror. An elliptic beam profile inside of the laser resonator which is caused by an inclination of an optical axis of the at least one concave folding mirror relative to a folded optical axis of the laser resonator is eliminated by an elliptic thermal lens in the laser medium whose optical action generates an ellipticity of the beam profile which is offset by 90&deg; relative to the elliptic beam profile generated by the folding mirror, wherein, by virtue of the material characteristics, the crystallographic orientation and the geometric dimensioning of the laser medium and by a choice of intensity and intensity distribution of the pump beam in the laser medium, the degree of ellipticity of the thermal lens is adjusted in such a way that the most uniform possible energy density distribution occurs over the irradiated zone of the saturable absorber.

Mode-synchronized solid-state laser

Device with a laser for image presentation

Device for image projection

Diode-pumped high performance solid state laser

Growing community of inventors

Jena, Germany

Juergen Kraenert