Method and device for producing a closed curved cut

A method of forming a cut which encloses a partial volume within a transparent material, by generating optical breakthroughs in the material by application of laser radiation focused into the material at a focal point substantially along an optical axis, comprising the steps of:

• adjusting the focal point three-dimensionally to form the cut by sequential arrangement of the optical breakthroughs;
• and
• adjusting the focal point along a spatial spiral, which is located in a desired location of the cut and extends along a main axis that is at substantially right angles to the optical axis.

A method of forming a cut which encloses a partial volume within a transparent material, by generating optical breakthroughs in the material by application of laser radiation focused into the material at a focal point along an optical axis, comprising the steps of:

• adjusting the focal point three-dimensionally to form the cut by sequential arrangement of the optical breakthroughs;
• and
• adjusting the focal point along elevation lines in the desired location of the cut, which are located in planes that are substantially parallel to the optical axis.

A device for forming a cut which encloses a partial volume within a transparent material, said device comprising:

• a source of laser radiation, which focuses laser radiation into the material at a focal point and causes optical breakthroughs substantially at the focal point along an optical axis,
• a scanning unit, which three-dimensionally adjusts the focal point and
• a control unit, which controls the scanning unit to form the cut by serial arrangement of the optical breakthroughs in the material, wherein the control unit adjusts the focal point along a spatial spiral, which is located in the desired location of the cut and extends along a main axis that is at substantially right angles to the optical axis.

A device for forming a cut which encloses a partial volume within a transparent material, said device comprising:

• a source of laser radiation, which focuses laser radiation into the material at a focal point and causes optical breakthroughs substantially at the focal point along an optical axis,
• a scanning unit, which three-dimensionally adjusts the focal point and
• a control unit, which controls the scanning unit to form the cut by serial arrangement of the optical breakthroughs in the material, wherein the control unit adjusts the focal point substantially along elevation lines, which are located in planes that are substantially parallel to the optical axis.