Fluorescence Properties Of Nd3 Research Articles

Synthesis, crystal structure and fluorescence properties of Nd3+ complex with tetrabromoterephthalic acid

A novel neodymium complex Nd2(BTPA)3⋅10H2O was synthesized by the reaction of chlorine salt of Nd3+ and tetrabromoterephthalic acid. The complex was characterized by single-crystal X-ray diffraction, FT-IR and TG analysis. Single crystal X-ray diffraction analysis reveals that the compound crystallizes in triclinic system with centrosymmetric space group P-1. From the absorption and luminescence spectra, Judd–Ofelt analysis has been carried out for the complex. The luminescent spectrum of the complex shows emission bands characteristic of the Nd(III) at 1064nm. The result shows that the complex has a small Ω2 due to the antisymmetric crystal field. However, the complex has a large stimulated emission cross-section about 5.031×10−20cm2 which is advantageous for the design of laser.

Investigation on 1.07 μm laser emission in Nd3+-doped sodium fluoroborate glasses

Spectroscopic and fluorescence properties of Nd3+ ions in sodium fluoroborate (SFB) glasses were prepared and characterized through optical absorption, emission and decay measurements. The energy level analysis was carried out using free-ion Hamiltonian model. Experimental oscillator strengths were determined by measuring the area encompassed by the absorption peaks recorded for 1.0 mol.% Nd3+- doped glasses. The Judd-Ofelt parameters (Ω2,4,6) were used to evaluate the laser characteristic parameters such as radiative transition probability (AR), radiative decay time (τR), fluorescence branching ratio (βR) and stimulated emission cross-section (σe) for the 4F3/2 metastable state. The fluorescence spectra for different concentrations of Nd3+ ions were recorded by exciting the samples at 514.5 nm Ar+ ion laser.

Preservation of fluorescence and Raman gain in the buried channel waveguides in neodymium-doped KGd(WO_4)_2(Nd:KGW) by femtosecond laser writing

We report on the preservation of fluorescence and Raman gain in low-repetition-rate femtosecond laser written buried channel waveguides in neodymium-doped KGd(WO4)2. The propagation loss index, profile reconstruction, and calculation of the modal intensity distribution by the beam propagation method of the waveguide are presented. Microluminescence spectra of the waveguides show that the fluorescence properties of Nd3+ ions are not significantly affected by the waveguide formation processing, which indicates a fairly good potential for further laser actions in a compact device. Micro-Raman spectra are also performed to reveal the preservation of the characteristic 768 and 901 cm-1 Raman mode intensities in the guiding regions.

Spectroscopic properties of neodymium doped high silica glass and aluminum codoping effects on the enhancement of fluorescence emission

Nd3+-codoped and Al3+-Nd3+-codoped high silica glasses have been prepared by sintering nanoporous glasses impregnated with Nd3+ and Al3+ ions. The Judd–Ofelt intensity parameters Ω2,4,6 of Nd3+-doped high silica glasses were obtained and used to analyze aluminum codoping effects. Fluorescence properties of Nd3+-doped high silica glasses strongly depend on the Al3+ concentration. While Nd3+ ion absorption and emission intensities of obviously increase when aluminum is added to Nd3+-doped high silica glasses, fluorescence lifetimes decrease and aluminum codoping has almost no influence on the radiative quantum efficiencies. This indicates that aluminum codoping is responsible for an anti-quenching effect through a local modification of rare-earth environments rather than through physical cluster dispersion.

Fluorescence properties of Nd3+ doped stoichiometric LiNbO3 fiber single crystals by micro‐pulling down method

AbstractUsing the micro‐pulling down (μ‐PD) method, 1 and 3 mol% Nd2O3 doped near stoichiometric lithium niobate (LiNbO3) single crystal fibers were grown in 1 mm diameter and 35∼40 mm length. The grown crystal fibers were free of cracks and the homogeneous distribution of Nd3+ ion concentrations were confirmed by the electron probe micro analysis. The changes of fluorescence spectra were measured with respect to the Nd3+ ion doping concentration. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Preparation of a Nd3+-doped fluorozirconate glass laser fiber

In this paper the spectroscopic and fluorescence properties of several Nd3+-doped fluoride glasses were studied by experimental measurement and calculation using the Judd-Ofelt theoretical model. It is shown that the fluorescence properties of Nd3+ ions in the fluorozirconate glass are better than that in the fluoroaluminate glass and the fluorophosphate glass, and are further improved by the substitution of NaCl for NaF. A Nd3+-doped fluorozirconate glass fiber with a core diameter of 9 μm was prepared, and some laser properties of the fiber were measured using a Fabry-Perot cavity by pumping with a 514 nm Ar laser. A 1.05 μm CW laser with output power of 11 mW and slope efficiency of 20% at room temperature was observed.

Fluorescence properties of Nd3+ -doped InF3 based optical glasses

This paper presents the preparation and photoluminescence characteristics of a new series of Nd3+ -doped InF3 based glass systems of the following compositions: 48 InF324 BaF27 AlF320 RF1 NdF3 where RF=LIF, NaF and KF. Besides our understanding of the optical properties, the relevant physical properties concerning these glasses have also been dealt with. Based on the fluorescence results obtained from both the theory and experiments on these optical glasses, it was found that the Nd3+-doped Glass-A with 20 M% LiF was better in optical behaviour than the other two glasses.

SITE SELECTIVE SPECTROSCOPY OF Nd3+ AND Cr3+ SITES IN LiNbO3 CRYSTALS CODOPED WITH Mg2+ IONS

The fluorescence properties of Nd3+ in Nd : MgO : LiNbO3 and Cr3+ in Cr : MgO : LiNbO3 systems have been systematically studied after site selective laser excitation. Three kinds of sites have been detected for the active (Nd3+ or Cr3+) ions. Two sites correspond to the active ion located in Li+ and Nb5+ lattice positions, and also appear in the singly (without MgO) doped systems. Codoping with Mg2+ ions induce the appearance of a new site for the active ion, together with a decreasing in the Li/Nb occupation ratio.