Optical system for ophthalmic surgical laser

1. A laser system for ophthalmic surgery, comprising;

a laser source, to generate a pulsed laser beam;

a first Z scanner,

to receive the pulsed laser beam, and

to output a Z-scanning beam, scanned over a first Z scanning range,

an XY scanner,

to receive the pulsed laser beam from the first Z scanner, and

to output an XY-scanning beam, scanned in two directions transverse to a Z direction;

a second Z scanner in a scanner housing,

to receive the XY-scanning beam, and

to output an XYZ-scanning beam, scanned additionally in the Z direction over a second Z scanning range;

a mirror, to deflect the XYZ-scanning beam received from the Z scanner; and

an objective, in an objective housing,

to receive the deflected XYZ-scanning beam; and

to focus the received XYZ-scanning beam onto a target region, wherein

the scanner housing is separate from the objective housing.

2. The laser system of claim 1 , wherein:

the scanner housing is separate from the objective housing at least one of mechanically and functionally.

3. The laser system of claim 1 , wherein the second Z scanner comprises:

a first beam expander block; and

a movable beam scanner, wherein

the first beam expander block can be one of a fixed block and a movable block.

4. The laser system of claim 1 , wherein:

the second Z scanning range is between 5 mm to 10 mm.

5. The laser system of claim 1 , wherein:

the second Z scanning range is between 0 mm to 15 mm.

6. The ophthalmic laser system of claim 1 , wherein

the second Z scanner is configured to reduce the numerical aperture as the focal depth is increased.