To decompose benzene derivatives which do not absorb the ruby laser beam, the mixed targets of benzene derivatives with nickel, zinc, selenium or phosphorus powder have been heated by the normal ruby laser. The mixed target of phenylalanine gives toluene and benzene as the main products, and the ratio of benzene to toluene shows the largest value for the target mixed with phosphorus. The decomposition of phenylace-tamide and dibenzyl shows similar results to that of phenylalanine. By the laser heating, the mixed target of benzoic acid is decomposed in methane and in halomethane. The products are benzene and toluene in the former, and are benzene, toluene and halobenzene in the latter.
From the experimental result that the product ratio in the laser heating differs from that in the conventional heating, the reaction mechanism induced by laser is discussed.

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Performances of amplifiers, optical isolators and power supply system which constitute GEKKO XII Module high power glass laser system are described. GEKKO XII Module was developed during 1977-1979 and its remarkable laser characteristics were already published. A lot of efforts and various attempts had been made in order to obtain high components performances. The measured data not only satisfied specifications required for system operation, but also showed that those components were fairly cost-effective. Through the development of components, the designing and manufacturing techniques for high power glass laser components were sufficiently established and are expected to give technical bases for more scaled-up high power glass laser system; GEKKO XII System for KONGOH Project.

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An aerodynamic window which utilizes a nozzle having a free-vortex distribution at its exit requires relatively little mass flow rate and does not degrade the laser beam quality significantly. In the present investigation, an analytical procedure has been developed for the design of a free-vortex supply nozzle. The method of characteristics has been employed in the analysis. The validity of the nozzle contour obtained by the method has been established by experiments which include the static pressure measurements and shadowgraphs of the flow field.

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We have investigated non-equilibrium Si with extremely high impurity concentration of Te and Zn fabricated by means of pulsed-laser annealing and ion implantation. It was found that there exists a significant difference of segregation and lattice between II (Zn)-and VI (Te)-colum atoms after laser annealing. It was possible to dope subsititutional Te impurity up to some 5×10²⁰/cm³ and fabricate the non-equilibrium Si: Te system with n-type conduction.

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