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The gascooled fiber has a fiber core diameter of 600 μm. The application diameter is between 1.8 and 2.1 mm. The distal end of the fiber has a flat tip with a nozzle. The medical application fields for the gascooled fiber are gastroenterology and pneumology, for instance. Laser coagulation as a method for medical application with this fiber has particularly proven itself for gastric tumors and carcinomas. It is also suitable for the therapy of vulnerable tumors and rare symptoms such a the GAVE syndrome ("watermelon stomach") and angiodysplasias. Last but not least, the use of the fiber for such medical application fields as argon plasma coagulation technology (APC) and electrocoagulation technology is also known. The 600 μm fiber core diameter is ideally suitable for the use of the Nd:YAG laser, with which the most extensive experience has been gathered in thermal tumor destruction at a wavelength of 1064 nm according to medical process descriptions. We of course also offer individual solutions.