We developed a ruby laser system with a handpiece utilizing a “Kaleidoscope (Trade Mark pending)”, to produce a uniform intensity distribution over a square area for the purpose of treatment of nevus. In order to increase its maneuverability, we have improved the design of this handpiece by using a small “Kaleidoscope”, through which a laser beam becomes uniform with a square cross-section and is magnified to a desired area by a lens. By utilizing this handpiece we have been able to realize the following advantages.
(1) Irradiated area is easily adjusted by changing the position of the lens.
(2) A compact “Kaleidoscope” is used to make the handpiece light and comfortable to use.
(3) The “Kaleidoscope” does not contact the patient, so its output surface cannot become contaminated.
(4) Changeable positioning collars each with an irradiation window in a transparent disc allow quick and accurate adjustment of irradiation area and location
