By using a cyclic olefin polymer (COP) as a coating material inside a silver hollow glass tube, we have fabricated various fibers with special characteristic features. By changing the thickness of COP film, the red or green pilot beam has been transmitted with relatively small losses for fibers that transmit Er:YAG or CO2 laser light simultaneously or independently with small losses. Sealing of input or output end of hollow fiber by the polymer COP has been conducted to make a special output device. The process of fabrication is simply made by using dipping and curing process. Power capability and output pattern of the sealed hollow fibers have been discussed experimentally.