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The new wavelength laser devices which seem to be suitable for medical applications have been developed currently. The symposium entitled "New laser devices for medical applications" focused on an adaptability ofthese laser devices for the wide varietyof therapies. In order to discuss applicabilityof these lasers for therapeutic applications inthis symposium, I describedthe basicidea of therapeutic laserin termsof the laser tissue interaction theoryand laser energydeliverythrough the optical fibers. The most applicable optical fiber for medical applications is the silicaglass fiber. It is the onlyglassfiber whichis used in actualmedicaldevices. The useful wavelength region isfrom 300nm to2ƒÊm. There are two otherpromisingfibers. Theyarethe chalcogenideglass fiber for5ƒÊm band and fluorideglass fiber for 3ƒÊm band. The chalcogenideglass fiber hassufficient flexibilitywithsmall allowablebendingradius despitethe fluorideglassfiber has bettermechanicalproperties than thechalcogenide in bulkglass. The pulse laser ablation can offer restricted thermal damaged layer thickness which is independentfromirradiation time(period). However, itisnecessarytoadjust the pulse width, repetition rate, and fluence to establish such the optimum pulse laser ablation. The pulse width and repetition rate are determined by the specific thermal diffusion time which is calculated bythepenetration depth of irradiatingwavelength in the livingtissue. For example,thefreerunningmodeEr:YAG laserof whichpulse width is200gs indicates cwablation even Er:YAG laser irradiation ispulsed.The repetition rateis limited to 5Hz in Ho:YAG laser ablation, however, the repetition rate of 20Hz maybe allowed in Tm:YAG laser ablation. 【はじめ に】 レーザ ー装 置 の実用化研 究が進展 し、医 学応用 に使用 可能 な新 しい装置 が 出現 して いる。本 論文 では新 しい波 長の医用 レーザ ーの議論 を行 な うために必 要な、 レー ザー 照射時の組織 作用 とファイバー伝 送に関す る特性 につい て解説 する。組織 作用 と して は 、 熱 作 用 機 構 に よ る 切 開 ・蒸 散 の み を 対

CONSIDERATION OF NEW WAVELENGTH LASERS FOR MEDICAL USE ON LASER TISSUE INTERACTION AND FIBER DELIVERY CAPABILITY