Influence of hydrogen on the colour center formation in optical fibers induced by pulsed UV-laser radiation.

Optical fiber-based photocathode

“…The emission area in this configuration is given by the size of the optical fiber core. At this wavelength, solarization of the fiber through color center formation [17][18][19] is significant. The 100 lm fiber is a solarization-resistant polyimide coating fiber, while the 50 lm fiber is a standard multi-mode fiber as used in nearfield scanning optical microscopy (NSOM) experiments.…”

Fuel-rich methane oxidation in a high-pressure flow reactor studied by optical-fiber laser-induced fluorescence, multi-species sampling profile measurements and detailed kinetic simulations

“…There are two types of fused-silica fibers, characterized by their OH-content originating from the manufacturing process, commonly referred to as high-OH and low-OH. The fiber material's inherent, fabrication-induced impurities and defects may lead to undesired fluorescence, additional Raman bands, color-center formation, and photodegradation effects [13,14,15,16]. Stimulated Raman scattering and nonlinear effects become important only for long fibers or higher laser intensities [15].…”

Improvement of transparency and durability to deep ultraviolet light in fluorine-doped silica glass fiber by optimizing the preform fabrication process

“…Details of the optimization of fiber-drawing process are explained elsewhere. 7),8) After the fiber-drawing, the fibers were immersed in a hydrogen atmosphere of 1 MPa for 14 d. 8), 10) In order to measure the optical properties of the obtained fibers, the transmittance spectra in DUV-VUV region were measured by the cutback method using a Seya-Namioka type VUV-spectrometer (Bunko-Keiki Co., Ltd.). Cutback length of the fiber was 60 cm from the total length of 120 cm.…”