RESUMEN
Ho3+ doped and Ho3+/Yb3+ co-doped low phonon heavy metal tellurite glasses with large refractive indices were designed and fabricated. Based on optical absorption, Judd-Ofelt parameters Omega2, Omega4 and Omega6 were derived to be 4.373 x 10(-20), 1.906 x 10(-20) and 1.451 x 10(-20) cm2, respectively. Then the radiative transition probabilities, radiative lifetimes and fluorescence branching ratios were calculated. The efficient infrared emission in Ho3+/Yb3+ co-doped bismuth tellurite glass system was recorded under the pumping of a 982 nm diode laser and Yb3+ was considered to be a preferable sensitizer for catching remarkable pumping energy and transferring considerable energy to Ho3+. The maximum absorption and calculated emission cross sections are 5.63 x 10(-21) cm2 at 1.95 mm and 6.24 x 10(-21) cm2 at 2.05 mm, respectively, which are larger than the values in phosphate and fluoride glasses, and are beneficial in lowing laser threshold as well as realizing efficient laser output of Ho3+. Low maximum photon energy and high emission cross sections indicate that Ho3+/Yb3+ co-doped low phonon bismuth tellurite glasses will be promising infrared laser materials.
RESUMEN
A new method for measuring the spectral power distribution in Sm3+-doped bismuth tellurite glass with higher refractive index and lower phonon energy by using integrating sphere was introduced and designed for the first time. Fluorescence measurement system was constituted by integrating sphere of 10-inch diameter, which was connected to a DDC detector. A standard halogen lamp was used to calibrate the measurement system and the auxiliary standard halogen lamp was employed for collating inner change in integrating sphere. The total radiant flux, total luminous flux and total quantum yield were calculated by luminous flux distribution and photon distribution, which were derived from spectral power distribution, and the values were 55 microW, 0.02 lm and 4.07%, respectively. In the present paper, the integrating sphere-method was applied to measure the luminescence parameters of the multichannel transition emissions in Sm3+, and it was considered as an accurate way to characterize luminescence parameters for luminescence and laser material.
RESUMEN
In the present paper, Sm3+ doped borate glasses (LBLB) with high effective visible fluorescence emission have been synthesized. The absorption and fluorescence spectra of this glass were measured and analyzed. The absorption spectra were fitted by J-O theory, and the intensity parameters omega = (2, 4, 6) were found to be 6.81 x 10(-20), 4.43 x 10(-20), and 2.58 x 10(-20) cm2, respectively, then the relative intensity of spectral lines of every energy level transition, radiative transition probabilities, radiative lifetimes, and fluorescence branching ratio were calculated. Under the excitation of UV light, Sm3+ doped borate glasses (LBLB) emit bright salmon pink light. The excitation spectra indicate that argon laser is an effective excitation source in Sm3+ doped LBLB glasses.