Abstract: A frequency-converting laser device that is efficient but at the same time has a simple structure contains an optical resonator that has two resonator mirrors, specifically a coupling-out mirror and an end mirror. The laser device furthermore contains an optically active medium for generating light of a first frequency and an optically nonlinear medium for converting light of the first frequency into light of another frequency. The optically active medium and the optically nonlinear medium are in this case arranged in a beam path between the resonator mirrors. The laser device furthermore contains a first polarization-influencing laser optic that polarizes the light of the first frequency, reflected by the coupling-out mirror in the direction of the end mirror, such that a frequency conversion of the light thus polarized of the first frequency is suppressed, in particular minimized, when passing through the nonlinear medium.

Abstract: The invention relates to a short pulse laser (1) having a seed laser oscillator (2), a controllable pulse picker (4) for coupling out a laser pulse or a sequence of laser pulses, and an amplifier unit (5, 6) being mounted downstream of the pulse picker (5) and having at least one first amplifier stage (5) and a controllable first pump laser (8). The short pulse laser further includes a control unit (10) which is designed to control the pulse picker (4) and/or the first pump laser (8) such that the post-amplified laser pulses reach a predetermined power.

Abstract: The invention relates to a short pulse laser (1) having a first optical plate (3) on which a seed laser oscillator (4), a pulse picker (5), and a fiber coupling-in optical unit (6) are mounted so as to be mechanically stable in relation to one another, and second optical plate (7), which is separate from the first optical plate (3) and on which a fiber coupling-out optical unit (9) and at least one amplifier stage (8, 30, 31) are mounted so as to be mechanically stable in relation to one another. The fiber coupling-in optical unit (6) of the first optical plate (3) and the fiber coupling-out optical unit (9) of the second optical plate (7) are optically interconnected by a flexible light guiding element (10). The hybrid short pulse laser (1) has a compact design and can be operated at low cost.

Abstract: The invention relates to a short pulse laser (1) having a seed laser oscillator (2), a controllable pulse picker (4) for coupling out a laser pulse or a sequence of laser pulses, and an amplifier unit (5, 6) being mounted downstream of the pulse picker (5) and having at least one first amplifier stage (5) and a controllable first pump laser (8). The short pulse laser further includes a control unit (10) which is designed to control the pulse picker (4) and/or the first pump laser (8) such that the post-amplified laser pulses reach a predetermined power.

Abstract: The invention relates to a short pulse laser (1) having a first optical plate (3) on which a seed laser oscillator (4), a pulse picker (5), and a fiber coupling-in optical unit (6) are mounted so as to be mechanically stable in relation to one another, and second optical plate (7), which is separate from the first optical plate (3) and on which a fiber coupling-out optical unit (9) and at least one amplifier stage (8, 30, 31) are mounted so as to be mechanically stable in relation to one another. The fiber coupling-in optical unit (6) of the first optical plate (3) and the fiber coupling-out optical unit (9) of the second optical plate (7) are optically interconnected by a flexible light guiding element (10). The hybrid short pulse laser (1) has a compact design and can be operated at low cost.

Abstract: A pulsed solid-state laser comprises an optical resonator and a solid-state laser medium placed inside the optical resonator. A saturable absorber, such as a semiconductor saturable absorber mirror device for passive mode locking is placed inside the optical resonator, and a pumping source is provided for exciting the laser gain medium to emit electromagnetic radiation. The pumping source emits pump radiation which impinges on the laser gain medium in the form of a non-diffraction-limited focused pumping beam. The product of the stimulated emission cross section times the spontaneous fluorescence lifetime is low for the laser medium, e.g., 0.1.multidot.10.sup.-23 cm.sup.2 s for Ti:sapphire; nevertheless, the laser yields a high output power of a few Watt even if pumped with a non-diffraction-limited pumping beam. Pumping with a non-diffraction-limited pumping beam makes feasible solid-state lasers with remarkably smaller sizes and lower costs, but with the same performance as known lasers.