Properties of RE3+(Nd3+, Er3+) dopped lithium niobate(LN) nanocrystals prepared by sol-gel technique are investigated in this paper. The as-obtained LN nanocrystals are the only crystalline phase according to the X-ray powder diffraction (XRD) and transmission electron microscope (TEM) results. The absorption and emission spectra were measured in the visible and near infrared regions, and compared with that of melt-grown LN crystals. The excitation wavelength was 514 nm and 355 nm for Er3+ and Nd3+ dopped LN nanocrystal samples, respectively. A (4 I11/2-4I15/2) and a ( 4F3/2-4I11/2 ) near infrared lasing transition was measured at 1035 nm and 1077 nm in Er3+ and Nd3+ dopped LN nanocrystal samples, respectively. The results show red shifts in emission spectra in Er3+ dopped LN nanocrystal samples, and blue shifts in emission spectra in Nd3+ doped LN nanocrystal will be also discussed in the paper.
Generally, it is very difficult to prepare zinc aluminosilicate glasses because of its high melting temperature. In this work, transparent rare earth Eu3+-doped ZnO-Al2O3-SiO2 glass-ceramics were obtained by sintering the corresponding precursor gels, which were prepared by using tetraethylorthosilicate and inorganic salts as raw materials and by a sol-gel method. X-ray diffraction, infrared spectrometer and fluorescence spectrometer were used to characterize the as-prepared materials. The luminescence properties of Eu3+ in zinc aluminosilicate glass-ceramics were mainly studied. Results showed that ZnAl2O4 nanocrystals were precipitated from ZnO-Al2O3-SiO2 system and dispersed in the SiO2-based glass when the heat-treatment temperature was up to 900oC. A strong emission peak at 614 nm was observed and the peak is assigned to 5Do→7F2 transition of Eu3+ ions. The luminescence mechanism of Eu 3+ doped ZnO-Al2O3-SiO2 glass-ceramics was analyzed and discussed.
The Yb3+-Er3+ co-doped YAG nanocrystal powders have been successfully prepared by the simple sol-gel method at a low temperature. The gel was prepared from nitrates of yttrium, aluminum, ytterbium, erbium and citric acid, and was heat-treated at temperatures from 800 to 1000°C. The phase purity and microstructural features of the materials were analyzed by means of X-ray diffraction (XRD) and transmission electron microscopy (TEM). TEM result shows that the YAG nanocrystal particle size is about 20-50nm. The luminescence spectra for different Yb3+ and Er3+ dopant concentration was obtained at about 1.52um which is in the eyesafe regime where significantly higher pulse energies can be used without damaging human eyes.
In this paper, we reported the crystal growth and optical properties of Yb3+ and Er3+ codoped yttrium scandium gallium garnet (YSGG) crystal by the conventional CZ method. The growth conditions and XRD patterns are given out.. Excitation and luminescence spectra were also recorded at room temperature with a Model F111Ai spectrofluorometer using a 980nm LD laser as an excitation source. The results were discussed in detail.
In recent years there has been increasing interest in the synthesis of nanocrystalline metal oxides. Nanostructured garnets are of special interest due to their improved properties such as lower temperature sinterability, greater thermal stability, increased hardness, good optical properties etc. In our idea, the sol-gel method is a useful and attractive technique for the preparation of nanocrystalline powders because of its advantages: good stoichiometric control, the production of ultrafine particles and low temperature. In this paper, we reported the preparation and characterization of Yb3+ and Ho3+ codoped yttrium scandium gallium garnet (YSGG) nanocrystal powders by the sol-gel technique. The phase purity, mass loss, composition and microstructure features of the materials were analyzed by means of X-ray diffraction (XRD), TG analysis, infrared spectroscopy (IR) and transmission electron microscopy (TEM).
A new electro-optic polymer film PT/PEK-c has been prepared and investigated. This kind of film, especially c-axis oriented one, possesses good nonlinear optical properties. The structure of the film after poling was analyzed by x-ray diffraction. The result showed that the film was c-axis oriented. The transmittance of a 2.33-micrometer-thick film was measured in the wavelength range 320 to approximately 900 nm by means of a recording spectrophotometer. The transmittance of the film exhibited a sharp absorption edge at 360 nm. The optical band gap of the film was found to be 3.06 eV. The dielectric properties of PT/PEK-c film were investigated in terms of the dielectric constant (epsilon) r and the loss factor tg(delta) . They were measured by a capacitance bridge in the frequency range 1 X 102 approximately 3 X 106 Hz. The dielectric constant and the loss factor of a 2.33-micrometer-thick film at room temperature and 10 kHz frequency were determined to be 4.023 and 0.003, respectively.
Preparation, Stability and the optical properties of DMACB/PEK-c film were reported. The films have good transmittance and improved stability. By quasi-waveguide method. The refractive indices of the film, ne and no, were measured, which were 1.65800 and 1.63614 at 0.6328 micrometer, respectively; the film's electro-optic coefficients, (gamma) 33 and (gamma) 13 were also obtained, which were 80.80 pm/V and 32.88 pm/V, respectively.
The linear and nonlinear optical properties of a high-efficiency organic nonlinear optical crystal, 3-methoxy-4-hydroxy-benzaldehyde (MHBA), are investigated. The principal refractive indices at λ = 532 nm are nx = 1.70331, ny = 1.5624, and nz = 1.81376. Calculations show interesting critical phase-matching properties (frequency doubling of the Nd:YAG laser at 1064 nm and diode laser at 830 nm). The nonlinear optical coefficients, d21 = 25dKDP36 ± 10%, d22 = 10dKDP36 ± 10%, d23 = 33.3dKDP36 ± 10%, d24 = 8.3dKDP36 ± 20%, were determined. MHBA has potential as a practical frequency doubler of Nd:YAG and diode lasers.
A new oranometaItc cornplex NLO crystal---Thioseiniiarbazide Cadiium Thiocyanate(TSCCTC)
has been qrown from aquious soliiLion by temperature Iowerinq method.TSCCTC hetonis to orthoqonal
;ystern;space qroup P212121,and the unit cell paranwters are a.764, b:lO.765K1) cl2.9781I(1)A.
The .rystat structure, tiiiear and nonlinear optical properties of TSCCTC are presented
in this liaper.
Recentty,orqarnaetatlic couptex crystals have attracted peoples in the exploration of new
nonlinear optical and uLtifunctionat aateriats.This is because of their wide transparent ranqe:
, Large nonlinear optical susceptibiLities, stable chemicaL and good sechanicat properties.
Followinq the double group structure aodeL1,we have found and qrn a series of organometatlic
complex crystals----BTCC2,TSCCC3,ATCC4.After AItC,we have discovered and grown several new
crystats--Altylthiourea Cadiii(Mercury) Ihtoride or Bro.ideM[QI21HO12MItH,} 3X2, M= Cd,
Hg;xCl,Br.Their poier SHG efficiencies are all largerthan that of IJrea.This paper sainty
reports the growth. structure and properties of Tri-Allyithiourea Cadaii Bromide(ATtB)
Tri-Attyithiourea Cad*iu Chloride (ATCC) belongs to triqonat syste,space group R3c with
ab11.S27(4),c27.992(4)A.Its PM properties and 3MG effects were studed and the whole nonlinear
optical coefficients were obtained by MF iethxl.
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