Optical System for Ophthalmic Surgical Laser
A laser system for ophthalmic surgery includes a laser source to produce a surgical pulsed laser beam, an XY scanner to XY scan the surgical pulsed laser beam in transverse directions, a Z scanner, to Z scan the XY scanned surgical laser beam along an optical axis, one or more auxiliary optical unit, generating auxiliary light, and an objective, to provide a shared optical pathway for the XYZ scanned surgical laser beam and the auxiliary light through an objective lens group into a surgical target region, wherein the lenses of the objective lens group do not move relative to each other, and the objective has no dynamic Z scanning function.
1 . A laser system for ophthalmic surgery, comprising:
a laser source to produce a surgical pulsed laser beam;
an XY scanner to XY scan the surgical pulsed laser beam in transverse directions;
a Z scanner, to Z scan the XY scanned surgical laser beam along an optical axis;
one or more auxiliary optical unit, generating auxiliary light; and
an objective,
to provide a shared optical pathway for the XYZ scanned surgical laser beam and the auxiliary light through an objective lens group into a surgical target region; wherein
the lenses of the objective lens group do not move relative to each other; and
the objective has no dynamic Z scanning function.
2 . The laser system of claim 1 , wherein:
the objective is configured to control at least one of a spherical aberration, coma, and higher order aberrations of the surgical pulsed laser beam.
3 . The laser system of claim 1 , wherein:
the auxiliary optical unit comprises an optical coherence tomography imaging system.
4 . The laser system of claim 1 , wherein:
the auxiliary optical unit comprises an illumination light.
5 . The laser system of claim 1 , wherein:
the auxiliary optical unit comprises a visual observational block.
6 . The laser system of claim 1 , wherein:
the objective is configured to focus the XYZ scanned laser beam and the auxiliary light onto the surgical target region in a range of wavelengths encompassing the wavelength of the XYZ scanned laser beam and the auxiliary light.
7 . The laser system of claim 6 , wherein:
the range of wavelength comprises the range of 0.4 microns to 1.1 microns.
8 . The laser system of claim 1 , wherein:
a mass of the objective is less than one of 400 grams, 750 grams, 1,300 grams and 3,300 grams.
9 . The laser system of claim 1 , wherein the objective comprises:
a first lens group, to receive the XYZ scanned laser beam from the Z scanner; and
a second lens group, to receive a laser beam from the first lens group,
the second lens group comprising
a first lens with an index of refraction in the range of 1.54 to 1.72, an entry surface with a curvature in the range of 37.9 to 65 l/m and an exit surface with a curvature in the range of −15.4 to 5.2 l/m;
a second lens, separated from the first lens by a distance in the range of 0 to 6.5 mm, with an index of refraction in the range of 1.56 to 1.85, an entry surface with a curvature in the range of −55.1 to −21.8 1l/m and an exit surface with a curvature in the range of 11.4 to 26.8 l/m; wherein
the second lens is configured to output the laser beam from the objective onto a patient interface.
10 . A laser system for ophthalmic surgery, comprising:
a laser source to produce a pulsed laser beam;
an XY scanner to scan the pulsed laser beam in transverse directions;
a Z scanner, to scan a focal spot of the pulsed laser beam along an optical axis; and
an objective,
to focus the scanned pulsed laser beam onto a focal spot in a target region,
having an internal entrance pivot point.
11 . The laser system of claim 10 , wherein:
a mass of the objective is less than one of 400 grams, 750 grams, 1,350 grams and 3,300 grams.
12 . The laser system of claim 10 , wherein:
an effective focal length of the objective is less than 70 mm.
13 . The laser system of claim 10 , wherein:
a distance from the objective to a patient interface is less than 20 mm.
14 . The laser system of claim 10 , wherein:
a curvature of a focal plane of the laser system is larger than 20 l/m.
15 . The laser system of claim 10 , wherein the objective comprises:
a first lens group, to receive the surgical pulsed laser beam from the Z scanner, and
a second lens group, to receive the surgical pulsed laser beam from the first lens group, the second lens group comprising:
a first lens with an index of refraction in the range of 1.54 to 1.72, an entry surface with a curvature in the range of 37.9 to 65 l/m and an exit surface with a curvature in the range of −15.4 to 5.2 l/m;
a second lens, separated from the first lens by a distance in the range of 0 to 6.5 mm, with an index of refraction in the range of 1.56 to 1.85, an entry surface with a curvature in the range of −55.1 to −21.8 l/m and an exit surface with a curvature in the range of 11.4 to 26.8 l/m; and
the second lens outputs the surgical pulsed laser beam from the objective onto a patient interface.
16 . A laser system for ophthalmic surgery, comprising:
a laser engine, to generate a pulsed laser beam;
an XY scanner to scan the pulsed laser beam in XY transverse directions;
a Z scanner, to scan a focal spot of the pulsed laser beam along a Z axis; and
an objective, having a mass of less than 3,300 grams.
17 . The laser system of claim 16 , wherein:
a mass of the objective is less than 1,350 grams.
18 . The laser system of claim 16 , wherein:
a mass of the objective is less than 750 grams.
19 . The laser system of claim 16 , wherein:
a mass of the objective is less than 400 grams.
20 . The laser system of claim 16 , wherein:
the mass of the objective is one of an optical mass and a total mass.
21 . The laser system of claim 16 , wherein:
the objective does not scan a Z focal depth of the focal spot.
22 . The laser system of claim 16 , wherein:
the objective has an entrance pivot point inside the objective.