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 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.
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.
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