System for therapy of the eye by treating tissue using non-linear interaction

A system for therapy or measurement of the eye by treating tissue using nonlinear interaction with therapy or measurement radiation, the system comprising:

• a laser device for providing the therapy or measurement radiation in a form of a first short-pulse radiation at a first centroid wavelength and of a second short-pulse radiation at a second centroid wavelength, which differs from the first centroid wavelength by at least 300 nm, wherein due to a pulse length of the first radiation, the first radiation covers a first wavelength range about the first centroid wavelength, and due to a pulse length of the second radiation, the second radiation covers a second wavelength range about the second centroid wavelength,
• a focusing device, including an objective lens, which comprises an image field lying in a therapy or measurement volume and which focuses the therapy or measurement radiation onto a focus in the image field such that the treatment or measurement is producible within the tissue using the nonlinear interaction,
• a z-scanner device, including a moveable lens, which adjusts a depth position of the focus in the therapy or measurement volume, and
• a control device for controlling the z-scanner device,
• wherein the system is configured to operate with the first radiation or the second radiation, but not simultaneously with both the first radiation and the second radiation,
• wherein optics of the system, including the objective lens of the focusing device, and the moveable lens of the z-scanner device, are configured to produce:
• a first longitudinal chromatic aberration which is constant over the first wavelength range within a first predetermined longitudinal chromatic aberration tolerance, and
• a second longitudinal chromatic aberration which is constant over the second wavelength range within a second predetermined longitudinal chromatic aberration tolerance,
• wherein the first and second longitudinal chromatic aberrations are different from each other causing a depth position offset of the focus of the second radiation against the focus of the first radiation and,
• wherein the control device is configured to control the z-scanner device such that, during operation with the second short-pulse radiation, the depth position offset is compensated by adjusting a position of the moveable lens of the z-scanner device.

A system for therapy or measurement of the eye by treating tissue using nonlinear interaction with therapy or measurement radiation, the system comprising:

• a laser device for providing the therapy or measurement radiation in a form of a first short-pulse radiation at a first centroid wavelength and of a second short-pulse radiation at a second centroid wavelength, which differs from the first centroid wavelength by at least 300 nm, wherein due to a pulse length of the first radiation, the first radiation covers a first wavelength range about the first centroid wavelength and due to a pulse length of the second radiation, the second radiation covers a second wavelength range about the second centroid wavelength,
• a focusing device, including an objective lens, which comprises an image field lying in a therapy or measurement volume and which focuses the therapy or measurement radiation onto a focus in the image field such that the treatment or measurement is producible within the tissue using the nonlinear interaction, and
• a z-scanner device, including a moveable lens, which adjusts a depth position of the focus in the therapy or measurement volume,
• wherein the system is configured to operate with the first radiation or the second radiation, but not simultaneously with both the first radiation and the second radiation,
• wherein optics of the system, including the objective lens of the focusing device, and the moveable lens of the z-scanner device, are configured to produce:
• a first longitudinal chromatic aberration which is constant over the first wavelength range within a first predetermined longitudinal chromatic aberration tolerance, and
• a second longitudinal chromatic aberration which is constant over the second wavelength range within a second predetermined longitudinal chromatic aberration tolerance
• wherein the first and second longitudinal chromatic aberrations are different from each other causing a depth position offset of the focus of the second radiation against the focus of the first radiation, and
• wherein the system comprises an optical refocusing element, which acts on the second radiation during operation with the second radiation, said refocusing element compensating the depth position offset.