Abstract
With the rapid development of infrared fibers and their applications, there is an increasing demand for applications at low temperature. In this paper, the CO2 laser transmission performances are investigated based on metallic GeO2 ATR hollow waveguide, showing the abnormal phenomenon of decreased transmission power at liquid N2 temperature (77 K). In addition, the influences of liquid N2 environment on the properties of GeO2 reflective film and hollow core gas medium have been investigated. The optical constants n and k of GeO2 are measured at low temperature, and the impacts of different fiber core gas media (dry air, Ar and N2) on low-temperature transmission performances are studied in detail. The results indicate that the decrease of transmission power is mainly due to the absorbance and scattering of solidified water vapor and liquefied air in hollow waveguide at low temperature. The transmission performance can be improved by filling the hollow fiber core with N2 gas. Specifically, the output power of fiber with appropriate N2 gas flow rate at low temperature could remain at a high level all the time, which is similar to the value of sample under room temperature. The present works could pave the way for the future transmission applications of mid-infrared hollow waveguide in cryogenic-temperature environments.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
