An ophthalmic laser system and related method for forming a lenticular incision in a corneal lenticule extraction procedure. The lenticular incision is formed by multiple sweeps of a laser scan line along meridians of longitude of the lenticular incision, where the end point of each sweep is connected to the start point of the next sweep by a smooth turning trajectory. The trajectory includes a first circular arc tangentially connected to the first sweep at its end point, a second circular arc tangentially connected to the next sweep at its start point, and a straight line segment tangentially connected to both circular arcs. The smooth trajectory is determined with the given limits of velocity, acceleration and jerk of the XY scanning motors, without using high frequency filters to smooth the trajectory, thereby avoiding unknown changes to the original trajectory and achieving high precision lenticule shapes.