To investigate the nonlinear optical properties of metallic nanoparticles in dielectric composite
materials, germano-silicate glass optical fibers incorporated with gold nanoparticles were made by
using modified chemical vapor deposition technique and solution doping process. The incorporation
of the gold nanoparticles was confirmed by the sharp absorption peak appeared near 498.4nm, which
was due to the surface plamon resonance absorption of Au nanoparticles. Resonant optical
nonlinearities of the fibers were estimated by measuring the peak shift of the fringes obtained from
the long-period fiber grating pair upon pumping with Argon laser at 488nm. The resonant nonlinearity
was found to be 5.00x10-16m2/W by the incorporation of the gold metal concentration and with the addition of Al3+ ions.
Few years ago, the inverse linear polarizing method (ILPM) has been suggested as an effective measurement method for the residual stress of optical fibers by Y. Park et al. and it has been used as an important tool to study photoelastic and birefringent characteristics of optical fibers. Non-elastic frozen-in residual stress was only recently found to be an important draw-induced inelastic strain that can significantly perturb the refractive index profile and hence the waveguiding properties of optical fibers. We have investigated residual stress distributions of optical fibers drawn at various draw tensions along the distance from the cleaved fiber end by using the ILPM. From the measurement of residual stress distributions and the definition of the mean axial stress, we calculated non-elastic frozen-in residual stress of optical fibers drawn at various draw tension. By the calculation of non-elastic frozen-in residual stress distributions of optical fibers, we have found that non-elastic frozen-in residual stress in the optical fiber can be released near the cleaved fiber end and release degree of non-elastic frozen-in residual stress near the cleaved fiber end is proportional to draw tension applied on the optical fiber fabrication. We have also found that non-elastic frozen-in residual stress along the cleaved fiber end becomes restored and restoration tendency of non-elastic frozen-in residual stress from the cleaved fiber end is dependent on draw tension applied on the optical fiber fabrication.
Refractive index change in the core of optical fibers by CO2 laser irradiation was measured by using a long period fiber grating (LPG) pair. Effect of drawing force applied to the optical fibers during drawing process on the refractive index change upon the CO2 laser irradiation was investigated. The refractive index was found to decrease linearly with the drawing force and it was due to the relaxation of the residual stress. Effect of the CO2 laser output power on the residual stress relaxation and the fiber elongation was also studied.
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