1 April 2008 Theoretical and experimental investigations of metal sulfide dielectric coatings for hollow waveguides
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Continuous efforts to develop low-loss flexible waveguides, to transmit mid-IR laser energy for minimally invasive surgical and diagnostic procedures, have been carried out by us and other groups. We have introduced sulfide dielectric films coated over an Ag reflecting layer as another potential solution. The metal sulfides used have high transparency in the IR spectrum, and their thickness can be tailored to minimize the attenuation over a selected wavelength range. The high refractive index contrast of the two metal sulfide materials enables us to produce multilayer hollow waveguides. These waveguide will have low attenuation in both straight and bent conditions, low sensitivity to coupling and to surface roughness, and a broad wavelength range. The lowest loss for a straight guide, measured at 1.55 μm for a 1,000-μm-bore Ag/CdS/PbS/CdS hollow glass waveguide (HGW), was 0.06 dB/m. This loss is three times less than that measured for a single-layer Ag/CdS-coated HGW at 1.55 μm. A theoretical simulation applying the same conditions showed the same pattern with a good potential for improvement.
© (2008) Society of Photo-Optical Instrumentation Engineers (SPIE)
Moshe Ben-David, Moshe Ben-David, Merav Catalogna, Merav Catalogna, James A. Harrington, James A. Harrington, Veena Krishnan, Veena Krishnan, Israel Gannot, Israel Gannot, } "Theoretical and experimental investigations of metal sulfide dielectric coatings for hollow waveguides," Optical Engineering 47(4), 045008 (1 April 2008). https://doi.org/10.1117/1.2896538 . Submission:

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