Abstract: Ag/AgI hollow glass waveguides are an attractive and flexible fiber for the delivery systems of IR radiation. By the liquid-phase chemistry deposition technique Ag/AgI
hollow glass waveguides with a length of 1.5m and an inner diameter of 1.0, 0.53, 0.32mm, respectively, were successfully fabricated. With the cutback method the attenuation
of waveguides was measured by using Infrared Fourier Translation Spectrometer (FTS--65A) and LTL--35A CO₂ laser. The results show that the attenuation (α) of Ag/AgI
hollow glass waveguides is low within 2.5-20μm wavelength and decreases with the increment of the inner diameter(a) as α∝１／α^３ .
Due to the heat on the insert end of waveguides the attenuation increases as the input power enlarges.

Key words: hollow glass waveguides, liquid-phase chemistry deposition technique, attenuation