Fumikazu Tateishi

Preparation and characteristics of the TlBr‐TlI fiber for a high power CO2 laser beam

The TlBr‐TlI (thallium bromoiodide) crystal and its fiber preparation method were studied in order to develop a high power CO2 laser beam fiber. As a result of this study, the most preferable composition for the fiber was determined to be 42 wt. % TlBr. The fiber (0.5 mm in diameter and 1.5 m in length) at that composition had the following excellent characteristics: (1) a high output power of 138 W (70 kW/cm2), (2) a high total transmissivity of more than 93%/1.5 m, and (3) a bending radius of ultimate 3.5 cm.

An optical cable for a CO 2 laser scalpel

This paper describes requirements of designing an optical cable for a CO 2 laser scalpel and a design concept satisfying these requirements. The optical fiber used is polycrystalline KRS-5 and the power delivered by this optical fiber ranges from 20 to 40 W. Since the optical cable consists of three parts-a connector, a cable, and a hand-piece-these parts have been discussed separately from the mechanical and optical point of view. Safety considerations also have been described especially in the case of fiber breaking and melting down.

Holographic memory system for Kanji character generation.

A Fourier transform holographic memory has been developed and used for generating and storing sixteen thousand Kanji characters. The memory consists of four groups of holograms of 63 pages, recording 64 Kanji characters in each page, and has a packing density of 1.34 x 10(7) bits/cm (2). Digitized characters of sixteen sizes can be generated with natural letter faces and good image quality. This paper focuses on the recording and reconstruction of holographic Kanji memory using a pseudorandom diffuser and systematic solutions consistent with optical, mechanical, and digital systems.