Coupling efficiency equation of optical coherence tomography system with gradient refractive index rod lens is
established and discussed theoretically and experimentally. The experimental result is consistent with the theoretical
result. The higher coupling efficiency of optical coherence tomography system can be obtained if the θ which is the
angle between mirror and y axis should be smaller than 0.5 degree.
In this paper, the oxide compositions model (OC model) is established for discussing the chromatic aberrations of
gradient refractive index rod lens. The chromatic aberration for K+ /Tl+ ion exchanges is discussed based on the OC
model and the Huggins-Sun-Davis (HSD) model. Theoretical result indicates that the function value mainly depends on
base glass properties and nature of exchanging ion pairs, and hardly depends on the quantity of ion exchanging.
Experimental results show that the chromatic aberrations using the OC model have smaller errors than them using the
HSD model. The estimating average error between the OC model and the HSD model is -0.051 for the K+ /Tl+ ion
exchanges.
A theoretical model for calculating the refractive index profile of gradient refractive index rod lens is established. Gradient refractive index rod lenses are prepared using double ion exchange processes, and their optical characteristics have been evaluated for the first time to the best of our best knowledge. The theoretical and the experimental results show that they agree well with each other. Moreover, the refractive index profile and the optical performance of gradient refractive index rod lens in the two-step ion exchange process are superior to them in the one-step ion exchange process.
In this paper, the diffraction intensity of the Maxwell fish-eye spherical lens is analyzed using the
matrix optic theory and the experimental setup. In addition, the diffraction intensity of the homogenous
spherical lens is given basing on Kirchhoff's diffraction theory. Comparing the theoretical data and the
experimental data of the Maxwell fish-eye spherical lens and the homogenous spherical lens,
respectively, there are good agreed with each other. Results indicate the diffractive intensity of the
Maxwell fish-eye spherical lens and the homogenous spherical lens is lager than 95% and smaller than
80%, respectively, and the Maxwell fish-eye spherical lens has smaller focusing size than the
homogenous spherical lens.
In this paper, the polynomial which is used to calculate the gradient refractive index profiles of gradient
refractive index ball lenses is given, and the gradient refractive index profiles of gradient refractive
index ball lenses can be measured using shearing interferometer rapidly, automatically and
nondestructively. Comparing the measuring results with the previous reports, we find the gradient
refractive index profiles of gradient refractive index ball lenses are precisely measured using the
shearing interferometer.
The long lasting phosphorescence glass spheres doped with Eu2O3 and Dy2O3 were prepared under the reducing
atmosphere and characterized. XRD analysis indicated the glass spheres exhibited the typical diffraction peaks of
SrAl2O4: Eu2+, Dy3+. The emission spectra of the glass spheres showed broad bands peaking at 510nm. The excitation spectra of the glass spheres showed broad bands ranging from 300 to 480nm. These are believed due to the 5d4f→4f
transitions of Eu2+ in the SrAl2O4: Eu2+, Dy3+ phosphors. The afterglow luminescence of the glass spheres excited by a
40W fluorescence lamp for 30min can be observed in the dark for about 15h with the naked eye.
This paper reports the ray trajectory and coupling efficiency of a GRIN ball lens and the functions of the ray trajectory in
the rectangular coordinate and coupling efficiencies are given. According to analyzing the ray trajectory and coupling
efficiencies, the focus performances inside/outside and at the surface of GRIN ball lenses are explained and
accordance with them of the Maxwell fisheye lens, the Luneburg lens, and the generalized Luneburg lens.
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