TY - JOUR
T1 - Transmission behaviors of metallic ATR mid-infrared hollow waveguide at low temperature and performance improvement
AU - Fu, Xiaohong
AU - Li, Guishun
AU - Zhang, Wenqian
AU - Zhong, Yi
AU - Lu, Xuehui
AU - Yue, Fangyu
AU - Jing, Chengbin
AU - Chu, Junhao
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/3/1
Y1 - 2020/3/1
N2 - 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.
AB - 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.
KW - Abnormal transmission behavior
KW - Cryogenic temperature
KW - Mid-infrared hollow waveguide
KW - Performance improvement
UR - https://www.scopus.com/pages/publications/85074156343
U2 - 10.1016/j.optcom.2019.124821
DO - 10.1016/j.optcom.2019.124821
M3 - 文章
AN - SCOPUS:85074156343
SN - 0030-4018
VL - 458
JO - Optics Communications
JF - Optics Communications
M1 - 124821
ER -