Flexible hollow waveguides for middle IR range

Development of hollow metal waveguides (1-1MW) with rectangular cross-section for delivery of high-power O and CO2laser light is described. We propose a loss calculation model for hollow waveguides that takes into account contribution of non-coherent light scattering on rougbnesses of reflecting surfaces, which allowed to define a wavelength dependence of HMW bending 1osses. Additional twisting losses in HMW are indenpendent of the quality of waveguide reflecting walls and they are practically indentical for JO and JO21aser wavelengths.