US 10,591,803 B2 · Variable-astigmatism beam adaptation device and frequency conversion units

Abstract

Beam adaptation devices are disclosed for variable-astigmatic adjustment of electromagnetic radiation propagating along a beam axis of the beam adaptation device. The devices include a first astigmatism lens unit, which provides at least one first lens tiltable with respect to the beam axis for astigmatism adjustment, a divergence matching lens unit with a second lens for adjusting the divergence, wherein the distance between the second lens and the first lens along the beam axis is adjustable, and a second astigmatism lens unit with at least one third lens tiltable with respect to the beam axis for astigmatism adjustment. To adjust the magnitude of the electromagnetic radiation on the third lens, the distance between the second lens and the third lens along the beam axis is adjustable. The beam adaptation device can be used, for example, for astigmatic pre-compensation in frequency conversion.

Claims20

Dependent claims

A beam adaptation device for continuously variable adaptation of electromagnetic radiation propagating along a beam axis of the beam adaptation device with respect to beam parameters, comprising:

a first astigmatism lens unit for receiving the electromagnetic radiation, wherein the first astigmatism lens unit comprises a first lens arranged to tilt with respect to the beam axis, for adjustment of astigmatism;
a divergence matching lens unit comprising a second lens for adjusting the divergence, wherein the distance between the second lens and the first lens of the first astigmatism lens unit is adjustable along the beam axis;
and
a second astigmatism lens unit comprising a third lens arranged to tilt relative to the beam axis for adjustment of astigmatism, wherein the distance between the second lens of the divergence matching lens unit and the third lens is adjustable along the beam axis.

1 more element

A frequency conversion method comprising:

providing electromagnetic radiation propagating along a propagation direction;
adapting the electromagnetic radiation with respect to beam size and divergence to form an output beam for a frequency conversion in at least one frequency conversion crystal;
and
generating a frequency-converted beam in the frequency-conversion crystal,
wherein the frequency conversion is characterized by a walk-off direction given for the frequency conversion with respect to the propagation direction of the output beam, and
wherein the adjustment of the output beam causes the beam shape of the output beam in or near the frequency conversion crystal perpendicular to the walk-off direction and to the propagation direction to be larger than in the walk-off direction.

3 more elements

Dependencies are inferred from the claim text.

Variable-astigmatism beam adaptation device and frequency conversion units

Life of this patent

Variable-astigmatism beam adaptation device and frequency conversion units

Life of this patent

Abstract

Claims20