Spectroscopic investigations of the new active media for diode-pumped solid-state lasers (original) (raw)
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Spectroscopic investigations of new active media for diode-pumped solid state lasers
ROMOPTO '94: Fourth Conference in Optics, 1995
Investigations of spectroscopic properties of yttrium-aluminum garnet Y 3 Al 5 O 12 (YAG) doped with ions of rare-earth elements Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ , Ho 3+ , Er 3+ , Tm 3+ , Yb 3+ monocrystals yttrium-aluminium perovskite YAlO 3 (YAP), SrLaGa 3 O 7 (SLGO) and :SrLaAlO 4 (SLAO) doped with Nd 3+ , and LiNbO 3 doped with Er 3+ and Tm 3+ obtained by the Czochralski method have been realized.
Analysis of absorption spectra of the crystals for coherent radiation pumped solid state lasers
Laser Optics '95: Solid State Lasers, 1996
Investigations of spectroscopic properties of yttrium-aluminum garnet Y 3 Al 5 O 12 (YAG) doped with Ce, Pr, Nd, Sm, Eu, Ho, Er, Tm, Yb ions and Nd:YAP, Nd:SrLaGa 3 O 7 , Nd:SrLaAlO 4 , Nd:YVO 4 , Nd:LiYF 4 , Nd:PbMoO 4 , Nd:LGS, Nd:GGG, Nd:SVAP monocrystals have been realized. Absorption spectra of the monocrystals in the range 200nm÷20µm and the luminescence spectra in the range 200-800 nm were determined. Except for Pr:YAG, Sm:YAG, Eu:YAG and Pr,Yb:YAG in all other materials an appearance of strong absorption bands in the range of 780-840 nm has been stated what enabled to carry out an efficiency analysis of selective pumping with the use of GaAlAs laser diodes.
Journal of the Optical Society of America B, 2008
High-optical-quality single crystals of Yb 3+ -doped YAlO 3 perovskite ͑Yb 3+ : YAP͒ were grown by the Czochralski (CZ) method and characterized. From polarized absorption and emission spectra, assignment of the Yb 3+ energy levels was proposed. Yb 3+ concentration dependence of experimental decay times allows us to study concentration quenching and suggests both strong radiative and nonradiative energy transfers, from Yb 3+ ions to impurities, well described by a limited diffusion model. Yb 3+ : YAP crystal is a potentially useful polarized laser gain medium in laser-diode-pumped solid-state configurations. 5.7 at. % Yb 3+ optimum concentration was deduced by prediction of laser performances. In addition, thermal properties and figure of merit, which is defined from our own model taking into account only spectroscopic data, were also compared with those of Yb 3+ -doped YAG. powders of 4N purity were used as starting materials without preliminary sintering. The starting melt compositions of Y 1-x Yb x AlO 3 were varied as x = 0.005, 0.02, 0.1, 0.2, 0.3, and 0.45. The Yb 3+ -doped YAP single crystals were grown by the Czochralski method (CZ) with automatic diameter control and a radio frequency induction heating system using an iridium crucible (inner diameter 40 mm, depth 40 mm), except the Y 0.995 Yb 0.005 AlO 3 , which was grown by the micro-pullingdown (-PD) method . During CZ growth, pure dry argon atmosphere was used both for premelting the raw materials and for crystal growth. The crystals were grown on the oriented seeds in the ͗100͘ direction at a growth rate of 0.1 mm/ h and a rotation rate of 12-13 rpm. After growth, the crystals were cooled at a rate of 60 K / h. The x-ray diffraction (XRD) patterns of Yb 3+ : YAP powders were obtained using a Rigaku RINT-V diffractometer with Cu K a radiation (40 kV, 40 mA). The scan time and the step size were 2°/ min and 0.02°, respectively. The 2 angle examined was 10°-80°.
Journal of Physics: Condensed Matter, 2011
A Yb 3+-doped mixed-perovskite single crystal (La, Sr)(Al, Ta)O 3 (LSAT) crystal is grown by the Czochralski method. The absorption spectrum, fluorescence spectrum and fluorescence lifetime of Yb 3+ ions have been investigated, and the spectroscopic parameters of Yb:LSAT have also been calculated. This crystal exhibits a remarkably large ground-state splitting (about 1100 cm −1), a relatively long fluorescence lifetime (0.85 ms) and broad absorption and emission bandwidths. The results indicate that the Yb 3+ :LSAT crystal is a good candidate for diode-pumped ultrashort and tunable solid-state laser applications.
It is well-established that colour centers (CCs) produced by ionizing radiation or short-wave radiation of the pump strongly influence optical characteristics of yttrium-aluminium garnet (YAG) monocrystals. Present work regards both the effects of gamma radiation on optical characteristics of YAG:Er, YAG:CTH crystals and examinations of generation characteristics of active elements made from YAG:Er or YAG:CTH crystals irradiated with gamma quanta as well. For comparison, optical characteristics of YAG and YAG:Nd crystals are presented.
Optical properties of Nd-doped ceramic yttrium aluminum garnet
Laser-Induced Damage in Optical Materials: 2004, 2005
The ceramic form of yttrium aluminum garnet (YAG) was studied to determine its suitability for high power lasers. The high Nd 3+ doping, the large material size, and the variable doping level with position in the sample, all achievable in ceramics as opposed to single crystal, may lead to higher power solid state lasers than those currently available. We have compared the optical properties of ceramic YAG doped with 0-9 at% Nd 3+ to single-crystal, 1 at% Nd:YAG material. Measurements included scattering, thermo-optic behavior, absorption, fluorescence, and laser damage.
Luminescent and thermo-optical properties of Nd (3+)-doped yttrium aluminoborate laser glasses
2009
In this work we performed a thorough spectroscopic and thermo-optical investigation of yttrium aluminoborate glasses doped with neodymium ions. A set of samples, prepared by the conventional melt-quenching technique and with Nd 2 O 3 concentrations varying from 0.1 to 0.75 mol %, were characterized by ground state absorption, photoluminescence, excited state lifetime measurements, and thermal lens technique. For the neodymium emission at 1064 nm ͑ 4 F 3/2 → 4 I 11/2 transition͒, no significant luminescence concentration quenching was observed and the experimental lifetime values ranged around 70 s. The obtained values of thermal conductivity and diffusivity of approximately 10.3ϫ 10 −3 W / cm K and 4.0ϫ 10 −3 cm 2 / s, respectively, are comparable to those of commercial laser glasses. Moreover, the fluorescence quantum efficiency of the glasses, calculated using the Judd-Ofelt formalism and luminescence decay, lies in the range from 0.28 to 0.32, larger than the typical values obtained for Nd 3+ doped YAl 3 ͑BO 3 ͒ 4 crystals.
Efficient 1 W continuous-wave diode-pumped Er,Yb:YAl_3(BO_3)_4 laser
Optics Letters, 2007
We report the spectroscopy and high-power continuous-wave (CW) diode-pumped laser operation of Er: Yb: YAl 3 ͑BO 3 ͒ 4 crystal. Absorption and stimulated emission spectra, emission lifetimes, and efficiency of energy transfer from Yb 3+ to Er 3+ ions were determined. A CW Er: Yb: YAB laser emitting at 1602, 1555, and 1531 nm with output power as high as 1 W and slope efficiency up to 35% was demonstrated.