Optical arrangement for pulse compression of a pulsed laser beam, and laser system

An optical arrangement for pulse compression of a pulsed laser beam, the optical arrangement comprising:

• a grating arrangement comprising a first diffraction grating and a second diffraction grating, wherein the pulsed laser beam passes the first diffraction grating and the second diffraction grating in succession,
• a beam-expanding device comprising at least one beam-expanding optical element for forming a divergent pulsed laser beam that enters the grating arrangement divergently, and
• a deflection device configured to steer the pulsed laser beam, after a first passage through the second diffraction grating, back to the second diffraction grating for a second passage therethrough with a beam offset that runs in a beam offset direction aligned perpendicular to a diffraction plane of the grating arrangement, and
• wherein the first diffraction grating and the second diffraction grating are arranged offset from one another by a lateral offset in the beam offset direction that runs perpendicular to the diffraction plane of the grating arrangement, wherein the lateral offset between the first diffraction grating and the second diffraction grating in the beam offset direction is given by:
• Δ
• ⁢
• H
• =
• 1
• /
• 4
• ⁢
• H
• G
• (
• H
• A
• -
• H
• E
• )
• /
• (
• H
• A
• +
• H
• E
• )
• ,
• wherein HG is an extent of the first diffraction grating in the beam offset direction, HE is an extent of a beam cross section of the pulsed laser beam in the beam offset direction during the first passage through the first diffraction grating, and HA is an extent of the beam cross section of the deflected pulsed laser beam in the beam offset direction during the second passage through the first diffraction grating.

An optical arrangement for pulse compression of a pulsed laser beam, the optical arrangement comprising:

• a grating arrangement comprising one and only one diffraction grating, and
• a beam-expanding device comprising at least one beam-expanding optical element for forming a divergent pulsed laser beam that enters the grating arrangement divergently,
• a first deflection device for producing a first beam offset in a first beam offset direction, and
• a second deflection device for producing a second beam offset in a second beam offset direction orthogonal to the first beam offset direction, the first deflection device and the second deflection device being arranged on opposite sides of the diffraction grating.