Rare earth doped microstructured fiber (MSF) is an excellent amplification carrier that can be effectively applied to high power fiber lasers. In order to improve the laser performance, it is very meaningful to compare the effects of different processes on the laser performance of rare earth doped core rod materials in rare earth doped microstructured optical fiber preforms. In this paper, the effects of different melting processes on the spectral properties of Yb-doped lithium silicate glass materials were studied. The simulation of the melting process of Yb-doped lithium silicate glass materials under different temperature fields was carried out based on COMSOL Multiphysics. The theory analyzes the causes of the different effects of the material spectrum. Based on the formulation of Yb-doped lithium silicate glass material, the temperature field under high temperature melting process, high temperature melting combined with ring oxyhydrogen flame melting process (referred to as secondary melting) was simulated and the spectral properties of the obtained glass samples were analyzed. The test compares the absorption and fluorescence spectra of the two smelting methods under the same formulation with the temperature field characteristics in the preparation process. The rare earth doped glass material prepared by the secondary melting process has good physical properties, superior spectral performance, and is more suitable for high power fiber. The core amplifying component of the laser - the conclusion of the preparation of rare earth doped microstructured fibers.
Glasses with different Er3+-doped concentrations were fabricated, and J-O theory, F-L theory and MC theory have been
used to calculate the spectral characteristics of Er3+ -doped glasses. The influences of Er3+ -doped concentration and the
composition of matrix glass material on the physical properties and spectral properties were analyzed and the best doping
concentration was obtained. The results confirmed that a strong Near-infrared fluorescence emission at the wavelength of
1534 nm was obtained with the pumped wavelength of 488 nm, 532 nm and 800 nm, respectively, in Er3+ -doped
cadmium silicate glass. The results obtained have confirmed that the sample was an excellent candidate for preparation
of doped photonic crystal fiber material.
In this paper, the numerical aperture (NA) of photonic crystal fiber (PCF) is measured by a system with spectrometer,
and high-precision results are obtained. The spectrometer can record the light intensity of different wavelengths. It
overcomes the limitation that the traditional measurement can only measure the NA in some fixed wavelengths. We get
the NA at any wavelength in 500nm~900nm range, which is determined by light source and spectrometer. Therefore, the
parameters related with NA can be better studied, such as: the mode field area, cut-off wavelength and so on. The
characterization of PCFs can be better represented too. The measured results are compared with theoretical calculation
value, and they agree with each other very well. According to the measured NA, the mode field area of sample fiber is
calculated and compared with simulation results calculated by fast-vector-method.
The glass samples of SiO2-Al2O3-CdO-Li2O-K2O-Na2O with different Nd3+-doped concentration are prepared by high-temperature
solid-state reaction method, and test the absorption spectrums as well as emission spectrum excited at 488
nm, 532 nm and 808 nm. The third-order optical nonlinear properties of glasses samples are investigated by the z-scan
technique. With the increment of doping concentration of Nd3+, the third-order nonlinear refractive index and the
absorption index increase, so it belongs to the self-focusing and reverse saturated absorption medium. The glass samples
open a outlook of application for nonlinear optical medium and excellent luminescence materials.
Using an improved borosilicate glass with small third-order optical nonlinearities, i.e., nonlinear refractive index (NLRI)
and nonlinear absorption coefficient (NLAC), as the matrix and comparative glass, two types of Ho3+-doped glass are
prepared with a solid-phase smelting process at a relatively low temperature, and their third-order optical nonlinearities
are measured by the closed-aperture Z-scan technique using nanosecond laser pulses at 532nm wavelength. It is found
that the matrix glass possesses a positive third-order NLRI and a positive third-order NLAC, and both the third-order
NLRI and NLAC of Ho3+-doped glasses are one order larger than those of the matrix glass, respectively. Also, an open-aperture
Z-scan experiment and an optical limiting experiment further demonstrate that the Ho3+-doped glasses have a
high third-order NLAC. All the experimental results show that this Ho3+-doped glasses have good protection
performance for the 532nm-laser.
The cadmium silicate glass samples of 40SiO2-14Al2O3-(40-x) CdO-2Li2O-2K2O-2Na2O-xEr2O3 (x=0.15, 0.20, 0.25,
0.30, 0.35, 0.40 mol) was prepared by high-temperature solid-state reaction method, and it is pumped at 488 nm, 532 nm
and 800 nm respectively. The results indicate that the main peak wavelengths are at 547 nm, 731 nm and 1534 nm
excited at 488 nm. The relationship of the intensity between the emission light of 731 nm and Er3+-doped concentration
is nonlinear. Near-infrared light nearby 1534 nm is excited at 532 nm and 800 nm, but it is weaker at 800 nm. The glass
samples open a outlook of application for conversion luminescence materials.
We have prepared (40SiO2-14Al2O3-(40-x) CdO-2Li2O-2K2O-2Na2O -x Eu2O3) cadmium aluminium silicate glasses
doped with europium by high temperature solid-state reaction method. The absorption spectra, excitation spectra,
emission spectra are obtained. With the increase of Eu2O3, the absorption peaks are founded increasing to the best doped
concentration and then reducing, which is nonlinear relationship. The charge-transfer band is moved to 320 nm due to
the addition of Cd2+. We can see that the ratio of peak in 591 nm and 615 nm is 0.6-0.75 in general, and is unrelated to
doped concentration. By changing concentration of Eu3+.We can adjust and mix different intensity of light according to