The Studies Of Si(Ge)/SiC/SiO₂ Infrared Transmitting Energy Hollow Fiber With Many Medium Film

The dissertation gives a comment on the field of energy-transmitting fibers for mid-infrared laser, an introduction to the mechanism of infrared-transmitting fibers in view of radiations and waveguides, and a theoretical analyze of the layer-selecting method for the fibers with multi-layer dielectric films.In view of the properties of SiC in the region of mid-infrared, the author has done many works about the energy-transmitting fibers with SiC, and summarized as follows:First, it is found that SiC is a very good material for the fabrication of power-transmitting fibers for mid-infrared laser, especially for CO2 laser that works at 10.6um wavelength, and SiC/SiO2 hollow fibers has not been studied in the world for the first time to our knowledge.Second, it is pointed out, for the first time to our knowledge, that the hollow fibers with a structure like Si/SiC/SiO2 or Ge/SiC/SiO2 have very good properties for the mid-infrared laser power transmitting, especially for CO2 laser.Third, the fabrication of hollow fibers with SiC films has been done with chemical vapor deposition (CVD), and the power-transmitting properties of the above samples have been obtained with an Austar 360 FTIR spectrometer and KYKY-2800 SEM. The kind of fiber has a 950um inner diameter and 3m length, and its transmitting loss is about 0.7dB/m which can be suitable for many applications.Finally, it is realized preliminarily that the fabrication of hollow fibers with SiC films, which concludes the process of fiber-drawing and coating, can be done in an organic whole with modified chemical vapor deposition (MCVD).