1. A system for calibrating laser pulses from a laser eye surgery system, the system for altering an eye while the eye is disposed at a treatment plane, the system comprising: an image capture device orientated toward the treatment plane so as to image the eye while the eye is altered by the system; a known object positionable for imaging by the image capture device; a pulsed laser beam delivery system oriented for directing a pulsed laser beam toward the treatment plane; a calibration surface supportable in an optical path of the pulsed laser beam so as to result in a mark on the calibration surface and for imaging of the mark on the calibration surface by the image capture device; and a processor coupled to the image capture device, the processor determining a calibration of the laser beam delivery system by comparing the image of the mark on the calibration surface to the image of the known object.