The Eu(DBM)3phen-doped polymer optical fiber slice was prepared, and the population of Eu3+ ion was up to 1.0
wt.-%. The chromatic dispersion and absorption characteristics of fractal clusters of Eu3+ ions in Eu(DBM)3phen-doped POF slice were explored. The dielectric components homogeneously and inhomogeneously doped circumstances of this
kind of POF slices were studied and their transmissions were analyzed and compared theoretically. Using near-field
scanning optical microscopy (NSOM), the near-field light intensities of this kind of POF slice were measured, and agreement was obtain between experiment and theory. The result indicates that the clustering in this kind of POF is not
The upconversion fluorescence spectra of Er3+/Yb3+: PLZT excited at 980 nm were measured from 10K to 320K. A
model for the dynamics of frequency upconversion process was proposed. Based on this model, the upconversion
luminescence intensities were fitted as a function of temperature and the temperature characteristics of upconversion
luminescence were discussed.
The absorption spectrum, upconversion spectrum and the fluorescence decay curve of Er3+/Yb3+ co-doped KY(WO4)2
crystal were measured. The radiative transition rates were calculated by Judd-Ofelt theory. A model for the dynamics of
frequency upconversion process in Er3+/Yb3+ co-doped KY(WO4)2 crystal was proposed. The Yb-to-Er energy transfer
rate and the upconversion coefficients were estimated by numerically solving the rate equations and fitting simulated
curve to the experimental data.
The luminescence decay curve from transitions of 4I 13/2->4I15/2 in the Er3+/Yb3+-codoped PLZT transparent ceramic was measured. A model for the dynamics of frequency upconversion in Er3+/Yb3+-codoped PLZT transparent ceramic based on the rate equations was proposed. The dynamics of the upconverted emissions were studied to evaluate energy transfer rates between Er3+ and Yb3+ ions, and the forward energy transfer rate for Yb3+ to Er3+ and the backward transfer rate for Er3+ to Yb3+ were 7.19x10-17 cm3s-1 and 3.73×10-17 cm3s-1, respectively.
Sm(DBM)3phen-doped polymer optical fibers were prepared by thermal polymerization. The cross relaxation model of
clustering Sm3+ ions was described, and the cluster in this kind of fibers was studied based on the above model. The
percentages of clustering ions in different fibers were obtained by the rate equation combining with fiber transmission
experiment. While rare-earth-doped concentrations in these fibers are 1000 ppm, 2000 ppm, 3000 ppm, 4000 ppm, 5000
ppm and 10000 ppm, the percentages of clustering ions are 0.05, 0.05, 0.05, 0.05, 0.06, and 0.07, respectively. The result
shows that this kind of fibers has low percentage of clustering ions. With the increasing of Sm3+ concentration, the
percentage of clustering ions hardly increases, the clustering of Sm3+ ions is not obvious.
The upconversion fluorescence spectrum and the luminescence decay curves from transitions of 4I13/2→4I15/2 and 4I11/2→4I15/2 in the Er3+-doped PLZT transparent ceramic were measured experimentally. A model for the dynamics of frequency upconversion in Er3+-doped PLZT transparent ceramic based on the rate equations was proposed. The dynamics of the upconverted emissions were studied to evaluate energy transfer (ET) rates by solving the rate equations of the model and fitting the experimental curves. The upconversion coefficient C22 for the cross relaxation 4I13/2+4I13/2→4I9/2+4I15/2 and the upconversion coefficient C33 for the cross relaxation 4I11/2+4I11/2→4I15/2+4F7/2 were 0.91×10-18 cm3/s and 18.23×10-18 cm3/s, respectively. The model provides a good basis for explaining the experiment data because it shows a high sensitivity to the input fitting parameters. The analysis reveals that Er3+-doped PLZT transparent ceramic have a great prospect to be applied for monolithic multifunction compact devices and upconversion devices.
The rhodamine B-doped polymer optical planar waveguide with low propagation loss of 0.44 dB/cm has been fabricated and measured by using scanning near-field optical microscopy and m-line method. The mode structure, near-field topography and near-field fluorescence are obtained, respectively. This may have potential applications in the study of polymer waveguide laser and amplifier.
The polarized emission behaviors of the Eu3+ doped azo-polymer waveguide were reported in this paper. Affected by the azobenzene groups in the photoinduced orientation process by the 532nm linearly polarized laser, the ligands were realigned orderly perpendicular to the direction of the orientation direction. This leads to the polarized absorption and emission of the waveguide in the orientation direction. By an m-line apparatus based on the prism coupling technique, two guided modes propagation were observed in the waveguide at 650nm in TE polarizations.
Optical absorption, excitation and emission spectra of Nd3+ in PLZT ceramics have been studied. Based on the Judd-Ofelt (J-O) theory, the J-O intensity parameters are calculated to be Ω2=0.7199x10-20 cm2, Ω4=1.045x10-20 cm2, Ω6=0.9234x10-20 cm2 from the absorption spectrum of Nd3+-doped PLZT. The J-O intensity parameters have been used to calculate the radiative lifetime (0.385 ms) of the excited 4F3/2 level. The stimulated emission cross-sections and the fluorescence branch ratios for the 4F3/2 -> 4IJ transitions are also evaluated. We have also measured 1.068 mm fluorescence lifetime (0.168 ms) and calculated its Quantum efficiency (0.44). Under 807 nm excitation, the green and red upconversion luminescence from Nd3+ centers in the ceramic was observed at room temperature. Analysis reveals that Nd3+-doped PLZT is promising for the use as efficient optically amplifying or zero-loss electro-optical devices in telecommunication networks.
This paper summarizes the material synthesis and properties of transparent electro-optic ceramics, namely OptoCeramic®, including PLZT and PMN-PT. Material structure, dielectric, optical and electro-optic properties are discussed. OptoCeramic materials feature in high E-O effect, low optical loss, broad transmission wavelength range, ceramic ruggedness, and low cost. A variety of devices made from OptoCeramic materials are discussed, including variable optical attenuators, polarization controllers, sinusoidal filters, dynamic gain flattening filters, tunable optical filters, and Q-switches.