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

Thoralf Springer

Juergen Kraenert

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.

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Jena, Germany

Thoralf Springer