Methods and systems to optimize ligament reconstruction surgical outcomes by enabling bone tunnel to be precisely and optimally placed through the use of pre-operative planning systems coupled with precision control bone evacuation machines, such as robotic drills are provided. In the chip pulse trains output by the n-th optical pulse time spreading element, the light in successive chip pulses is shifted in phase by successive integer multiples of the quantity 2\u03c0{a+N}, where a is an arbitrary constant. The annular diffuser can include a plurality of axicon lenses or holographic features. In the development of a Web application system, each of the components of the servlet, JSP, and Bean is defined in a one-to-one relationship corresponding to each screen image, thereby making the relationship among each of the components clear.