Abstract
Red semiconductor lasers are put to practical use in the 635nm to 680nm wavelength range. These lasers are applied to the optical disks for the application of DVD (Digital Video Disk). These lasers have suitable wavelength for photodynamic therapy (PDT), but doesn't have enough output power for PDT.So, we have developped high power red semiconductor lasers and laser systems for PDT:-664nm/5000mW system (1993), and 652nm/5000mW system (1996).We believe that these laser system will contribute to the spread of PDT.
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