An apparatus for imaging and treatment of skin of a subject, comprising a frame configured to circumscribe a target region of the skin. The apparatus further comprises an imaging branch and a laser branch contained in the frame. The imaging branch has an imaging path and configured to generate an image of the target region of the skin that is in proximity to a first end of the frame. The laser branch has a laser path and is configured to radiate electromagnetic rays from a second end of the frame towards the first end for treatment of the target region of the skin. The laser branch is adapted to radiate a circular beam of electromagnetic rays at the second end of the frame, and output a polygonal beam of electromagnetic rays at the first end of the frame for treatment of the target region of the skin of the subject.

A laser system may include a controller configured to direct a plurality of temporally spaced-apart electrical pulses to a device that optically pumps a lasing medium, and a lasing medium configured to output a quasi-continuous laser pulse in response to the optical pumping. The plurality of temporally spaced-apart electrical pulses may include (a) a first electrical pulse configured to excite the lasing medium to an energy level below a lasing threshold of the lasing medium, and (b) multiple second electrical pulses following the first electrical pulse. The quasi-continuous laser pulse is output in response to the multiple second electrical pulses.