Abstract: 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.

Abstract: An illumination device for a light modulated projector includes a first and a second colour wheel. A first filter surface of the first colour 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 colour 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.

Abstract: A method and a device for projecting an image made up of pixels onto a projection surface, including a variable-intensity light source emitting a light beam and a decoupling device, and a deflection device directing the light beam onto a projection surface. In The light beam(s) are deflected such that the beams strike mirror facets of the polygonal mirror twice in a row. The diameter at which the beam strikes the first mirror facet of the polygonal mirror is adjusted such that it is dimensioned to practically not be cut by the facet edges. At the second strike, the light beam always intersects the mirror facet at the same location.

Abstract: 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.

Abstract: An arrangement which generates red, green and blue laser radiation comprise a laser radiation source whose first beam (&lgr;l) is split in the infrared wavelength range, wherein the first part of this beam is frequency-doubled and green light (&lgr;G) results and another part is used to generate light of the primary colors red (&lgr;R) and blue (&lgr;B). Another part of the first beam (&lgr;l) is fed to a wavelength converter which generates another beam (&lgr;2, &lgr;4) in the infrared wavelength range which has a greater wavelength than the first beam (&lgr;l), further, the colors red (&lgr;R) and blue (&lgr;B) result from the further beam (&lgr;2, &lgr;4) or from a part thereof by another nonlinear process by sum frequency mixing or by frequency doubling or by sum frequency mixing and frequency doubling.

Abstract: A fiber amplifier is disclosed comprising a signal source (oscillator), an amplifier fiber and a pump laser. The amplifier fiber is arranged between two polarizers and a portion of the beam that is depolarized in the amplifier fiber is coupled out at the amplifier output, returned to the amplifier input, coupled into the amplifier fiber with the radiation from the signal source and amplified again, and another portion, as linearly polarized beam, exits the fiber amplifier as useful beam.

Abstract: An RGB laser radiation source comprising a first laser radiation source whose first beam (1) is divided in the infrared wavelength region, wherein the first part thereof is frequency-doubled and green (G) light results and another part thereof is used to generate light of another primary color. It is wherein a second beam (2) is split in the infrared wavelength region from a second laser radiation source, wherein a first part of the second beam (2) together with a second part of the first beam (1) is supplied to a first sum frequency mixing and red (R) light results, and, further, a second part of the second beam (2) is frequency-doubled. This frequency-doubled beam (3) together with a third part of the first beam (1) is supplied to a second sum frequency mixing and blue (B) light results.

Abstract: In a device with a laser for image presentation in which the laser emits laser light of a defined coherence length L at a given wavelength .lambda. and in which there is arranged in the path of the laser light a first structure with which phase displacements can be carried out for individual photons of the laser light in accordance with a predetermined distribution, it is provided that the average path given by the ratio of the average root mean square of the phase displacement formed by the distribution and the magnitude of the wave vector k=2.pi./.lambda. of the laser is greater than the coherence length L multiplied by a factor of 1/(12).sup.1/2.

Abstract: In an arrangement for displaying images on a projection screen, which arrangement includes a laser, which emits a laser beam, and a deflecting device, which is provided for deflecting the laser beam, and an image-generating device which is connected to a controlling device for controlling the laser and the deflecting means. The image-generating device is switchable in two operating modes, the first operating mode being the standard operating mode for projecting, and the second being an operating mode in which the laser radiation is harmless to a person disposed in the region to which the laser has access.

Abstract: A diode-pumped high performance solid state laser has at least one pump module comprising at least two laser diode arrays which transversely irradiate a solid state laser rod. The path length of the radiation emitted by a laser diode array through the solid state laser rod and the required absorption path for this radiation, determined by the emission wavelength of this radiation and the doping of the laser-active medium, are adapted to one another extensively in different ways.