Abstract: An optical arrangement includes a laser-active solid body configured to amplify and/or generate a laser beam. The laser-active solid body is in a form of a slab. The optical arrangement further includes a pump radiation source configured to generate a pump beam that propagates in a propagation direction and passes through the laser-active solid body for optical pumping the laser-active solid body, and a reflector arranged downstream of the laser-active solid body in the propagation direction of the pump beam. The reflector is configured to reflect the pump beam transmitted through the laser-active solid body back onto the laser-active solid body. The pump beam reflected by the reflector passes through the laser-active solid body for optical pumping the laser-active solid body.

Abstract: A method for generating secondary radiation includes providing a target material in a target region, and applying a pulse sequence of laser pulses to the target material in the target region. Secondary radiation is generated as a result of interaction of the target material with the pulse sequence. The pulse sequence has a pulse train of at least two pre-pulses and a main pulse following the pulse train. A total energy of the pre-pulses of the pulse train is between 0.2 mJ and 10 mJ. A temporal pulse interval between successive pre-pulses of the pulse train is between 50 ps and 500 ns. A pulse energy of the main pulse is between 2 mJ and 50 mJ. A pulse duration of the main pulse is between 15 fs and 300 fs. A temporal pulse interval between the pulse train and the main pulse is between 1 ns and 1 ?s.

Abstract: A method for generating secondary radiation includes providing a target material in a target region, and applying a pulse sequence comprising laser pulses to the target material in the target region. Interaction of the target material with the pulse sequence generates secondary radiation. The pulse sequence includes a prepulse and a main pulse trailing the prepulse. A pulse energy of the prepulse is between 2 ?J und 200 ?J. A pulse duration of the prepulse is between 200 fs and 5 ps. A pulse energy of the main pulse is between 2 mJ and 50 mJ. A pulse duration of the main pulse is between 15 fs and 300 fs. A pulse time interval between the prepulse and the main pulse is between 1 ps and 1 ns.

Abstract: A laser system for generating secondary radiation through interaction of a focused primary laser beam with a target material includes a laser beam source for providing a raw laser beam, and a beam guidance device for forming the focused primary laser beam from the raw laser beam. The focused primary laser beam is directed towards a target region in order to interact with the target material arranged in the target region. The beam guidance device includes a beam focusing device configured to form the primary laser beam by focusing a laser beam entering the beam focusing device, which corresponds to the raw laser beam. The beam focusing device includes at least two mirror elements spaced apart from one another. The beam focusing device has a numerical aperture between 0.001 and 0.01 provided that the primary laser beam propagates in a medium with a refractive index of less than 1.01.

Abstract: A laser amplifier includes a laser-active solid-state rod, through which an input laser beam passes at least twice, and a pump device for generating at least one pump laser beam which is incoupled into the solid-state rod via a first end face of the solid-state rod in order to optically pump the solid-state rod. The input laser beam is incoupled into the solid-state rod via a second end face of the solid-state rod. The input laser beam amplified in the solid-state rod is outcoupled from the solid-state rod in order to form an output laser beam. The laser amplifier further includes a dichroic mirror arranged in a beam path of the pump laser beam between the solid-state rod and the pump device and at an right angle to the pump laser beam. The dichroic mirror is transmissive for the pump laser beam and reflective for the input laser beam.

Abstract: A method and system for amplifying seed laser radiation which is irradiated along an irradiation direction into a lasing amplification medium has a transverse seed laser intensity profile that is transformed into a plateaued input intensity profile by a transformer element on the irradiation side.

Abstract: A method and system for amplifying seed laser radiation which is irradiated along an irradiation direction into a lasing amplification medium has a transverse seed laser intensity profile that is transformed into a plateaued input intensity profile by a transformer element on the irradiation side.

Abstract: The present invention relates to a system for modulating laser pulses by means of an electro-optical modulator which is operated by means of a pulsed modulation voltage. A voltage converter mounted upstream of the modulator converts a pulsed modulated switching voltage at an output voltage level to the modulation voltage that is higher than the output voltage level. The invention further relates to a method for modulating laser pulses.

Abstract: The present invention relates to a system for modulating laser pulses by means of an electro-optical modulator which is operated by means of a pulsed modulation voltage. A voltage converter mounted upstream of the modulator converts a pulsed modulated switching voltage at an output voltage level to the modulation voltage that is higher than the output voltage level. The invention further relates to a method for modulating laser pulses.