Mitsuhiro Iyoda

A computer model of a transverse discharge cw CO laser

A kinetic model has been developed for the investigation of the novel performance of a CO laser, on which efficient extraction of laser power was obtained by exciting a subsonic gas mixture of CO/N2/He/O2 through transverse dc discharge. Kinetic equations for direct excitation by electron impact, V-V and V-R/T energy transfer, and stimulated emission are coupled with a semi-one-dimensional flow model. Careful consideration is devoted especially to the V-V transfer process of CO−N2 and N2−N2. The laser power was calculated by a constant gain method. The laser output performance, examined as a function of gas mixture ratio, temperature, flow velocity, and discharge current, was in good agreement with the experiment.

Distributed computing for CO laser simulation

A new simulation code of CO laser has been developed for the recent distributed environment. The partial simulation code is transferred from the server and processed by the clients. The Java language which is independent on computer variation is introduced into the system description.

PC-based beam mode analysis of CO laser

A simple and compact computer code for the output beam mode analysis of the CO laser has been developed. The theoretical model based on the asymptotic expansion is converted to the computer model, which is divided into smaller structural modules. The program is described in C language in order to be compiled and executed by PCs, Mackintoshes, and workstations. The beam mode profiles under the multiline operation and misaligned cavity conditions are analyzed.

Computer Simulation For The Efficient Operation Of A CW CO Electric Discharge Laser

Optimum conditions for the efficient operation of a cw CO laser excited by transverse dc glow discharge using a gas mixture of CO/N2/He/02 has been investigated by computer simulation. The simulation model combines direct excitation process by electron impact, vibration to vibration ( V-V ) and vibration to rotation/translation ( V-R/T ) energy transfer process, spontaneous and stimulated emission process, and semi 1-dimensional flow model. One of the important experimental problems that the laser power output decreases against the increase in gas flow velocity is analyzed by the simulation. According to the computed results, the problem is not serious if the gas temperature is low enough or sufficient discharge current is applied. The possibility of the high power and efficient laser operation even at around 200 K is predicted by the simulation.

Parametric Analysis of a cw CO EDL by Computer Simulation

A computer simulation has been carried out in order to parametrically analyze and predict the output performance characteristics of a closed-cycle subsonic flow cw CO transverse EDL. The simulation is based on a multi-vibration-level model, a semi 1-dimensional flow model, and a plane parallel cavity model. As a function of parameters such as gas temperature, pressure, flow velocity, discharge current, and cavity conditions, the output power and electrical conversion efficiency of CO EDL have been analyzed.

Flexible laser simulator constructed in the integrated information processing environment

Execution, transfer, storage and display of laser simulation have been improved. The technology of virtual machine has been introduced to integrate different hardware and software environments. The same binary code for laser simulation is executed in the integrated environments.

Improvement of simulation computing for discharge exited gas lasers

Simulation for discharge exited gas flow lasers has been improved. The simulation codes are developed and executed by high performance programming technique and corresponding computer systems. The simulation performances are much superior to those by previous technique and systems.

Simulation for discharge excited gas mixture executed by cellular phones

Simulation by cellular phones has been developed for discharge excited gas mixture. The simulation codes suitable for relatively small size of internal memories are described in Java programming language and executed by cellular phones.

Implementation of simulation codes for gas flow CO lasers by the combination of server-side and client-side processing

New simulation code has been developed for gas flow CO lasers by the combined computing technique of server-side and client-side processing. The input and output interfaces are processed on the client-side and numerical calculations are processed on the server-side.

PDA simulator for the power distribution analyses of discharge-excited gaseous media

Compact programs have been implemented to the information devices of PDA, personal digital assistants, in order to analyze the power distribution of discharge excited gaseous media. The simulation codes are cross-developed between Macintosh computers and PDA.