Kenji Iwasaki

Square and uniform laser output device : theory and applications

We have developed a device whereby a laser beam is converted to a square and uniform output intensity distribution. This device consists of a square pillar. The laser beam enters the square pillar at a specified incident angle, and uniform output intensity distribution is obtained at the end of the pillar. We describe the theory and the characteristics and uses of this device. Furthermore, we developed the ruby and argon laser systems in which this device is incorporated as the handpiece. It is mainly for clinical use, but also for industrial purposes such as soldering and marking.

Possibility of Treating Hyperpigmented Skin Lesions Using the Nd: YAG Laser

The authors have developed a ruby laser system having a device to provide uniform output, the “Kaleidoscope” handpiece. This equipment can be used for the treatment of a hyperpigmented skin lesions, such as nevus spilus and nevus cell nevus. As a result, acceptable clinical results have been obtained*. However, the ruby laser was not effective for the treatment of deeply located intra-dermal hyper-melanoses.