Time-resolved study electronic and thermal contributions to the nonlinear refractive index of Nd3+:SBN laser crystals

Freitas, L. R. de; Jacinto, Carlos; Ródenas, Airán; Jaque, Daniel; Catunda, T.

doi:10.1016/j.jlumin.2007.11.078

Cited by 13 publications

(4 citation statements)

References 12 publications

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“…For systems with slow response times ͑microseconds to millisec-onds͒, such as Nd 3+ -doped materials, 2,10 the time-resolved Z-scan method has proved to improve the sensitivity by eliminating parasitic linear effects. 2,[19][20][21] The results obtained with this method are in agreement with those obtained from other techniques, particularly, in the case of Cr 3+ -doped crystals, which were most extensively studied by several kinds of interferometric and wave-mixing techniques. 22 In this work, this method was applied to a Nd 3+ : SBN 61 ͑Sr 0.61 Ba 0.39 Nb 2 O 6 with 0.5 at.…”

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confidence: 85%

“…2,20,21 Thermal processes, such as the thermal variation in refractive index, thermal expansion, and thermally induced stress, are also very important effects to be taken into account in solid-state laser engineering. 24 The TL phase shift is given by ⌬ th = P abs ͑ds / dT͒ / K, where P abs is the fraction of absorbed power ͑P abs ͒ converted into heat ͑the thermal power͒, ds / dT is the temperature coefficient of optical path length, and K is the thermal conductivity.…”

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confidence: 99%

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Nonlinear refraction and absorption through phase transition in a Nd:SBN laser crystal

et al. 2009

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Time-resolved Z-scan measurements were performed in a Nd 3+ -doped Sr 0.61 Ba 0.39 Nb 2 O 6 laser crystal through ferroelectric phase transition. Both the differences in electronic polarizability ͑⌬␣ p ͒ and cross section ͑⌬͒ of the neodymium ions have been found to be strongly modified in the surroundings of the transition temperature. This observed unusual behavior is concluded to be caused by the remarkable influence that the structural changes associated to the ferro-to-paraelectric phase transition has on the 4f → 5d transition probabilities. The maximum polarizability change value ⌬␣ p = 1.2ϫ 10 −25 cm 3 obtained at room temperature is the largest ever measured for a Nd 3+ -doped transparent material.

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Nonlinear refraction and absorption through phase transition in a Nd:SBN laser crystal

et al. 2009

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“…In principle, both thermal and population (electronic) lenses contribute to the observed transient signal [31,[42][43][44], but their relative magnitudes can be controlled by choosing the appropriate excitation beam diameters and detection time [31]. The electronic response time is approximately constant, around 250 μs for Nd:cYAG with a low Nd concentration, and it reduces when increasing the ion content.…”

Section: Tl Measurements: Thermal Diffusivity Quantum Efficiency and ...mentioning

confidence: 99%

Thermo-optical and spectroscopic properties of Nd:YAG fine grain ceramics: towards a better performance than the Nd:YAG laser crystals

Santos¹,

Benayas²,

Jaque³

et al. 2016

Laser Phys. Lett.

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In this work, we investigated the thermo-optical properties of highly Nd3+ doped YAG ceramics. The normalized lifetime thermal lens method was used to obtain the fluorescence quantum efficiency (η) versus Nd3+ concentration (Nt) and to study the energy transfer microparameters CDD and CDA. The Nt dependence of η was compared to the results of the previous literature. The CDA found is very similar to those of the previous literature, while the CDD is very different and higher than CDA, although the main dependence of η with Nt is assigned to CDA. The figure of merit (η.Nt versus Nt) indicated a maximum around 3.8 at.% Nd2O3, which in addition to the very low ds/dT value, evidences the YAG ceramic as an excellent material for an ultra-high-power microchip laser system and for devices requiring minimum pump-induced local heating generation.

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“…The remote nature of the TL method permits measurement of a sample using a furnace to modify the material temperature during measurements. 13 In our experiment, the sample was placed inside a temperature controlled furnace with a central hole that allowed the access of the laser beams. A He-Ne (632.8 nm) laser was used as a probe beam and a diode laser operating at 808 nm was used as an excitation beam.…”

Section: Experimental Details and The Theoretical Backgroundmentioning

confidence: 99%

Evidence of phase transition in Nd³⁺doped phosphate glass determined by thermal lens spectrometry

Andrade

Lourenço

Pilla

et al. 2014

Phys. Chem. Chem. Phys.

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Thermal lens spectroscopy (TLS), differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) techniques were applied to the thermo-optical property analysis of a new phosphate glass matrix PANK with nominal composition 40P2O5·20Al2O3·35Na2O·5K2O (mol%), doped with different Nd(3+) compositions. This glass system, synthesized by the fusion protocol, presents high transparency from UV to the near infrared, excellent thermo-optical properties at room temperature and high fluorescence quantum efficiency. Thermal lens phase shift parameters, thermal diffusivity and the DSC signal present pronounced changes at about 61 °C for the PANK glass system. This anomalous behavior was associated with a phase transition in the nanostructured glass materials. The FTIR signal confirms the presence of isolated PO4 tetrahedron groups connected to different cations in PANK glass. As a main result, our experimental data suggest that these tetrahedron groups present a structural phase transition, paraelectric-ferroelectric phase transition, similar to that in potassium dihydrogen phosphate, KH2PO4, nanocrystals and which TLS technique can be used as a sensitive method to investigate changes in the structural level of nanostructured materials.

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Time-resolved study electronic and thermal contributions to the nonlinear refractive index of Nd3+:SBN laser crystals

Cited by 13 publications

References 12 publications

Nonlinear refraction and absorption through phase transition in a Nd:SBN laser crystal

Nonlinear refraction and absorption through phase transition in a Nd:SBN laser crystal

Thermo-optical and spectroscopic properties of Nd:YAG fine grain ceramics: towards a better performance than the Nd:YAG laser crystals

Evidence of phase transition in Nd³⁺doped phosphate glass determined by thermal lens spectrometry

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Time-resolved study electronic and thermal contributions to the nonlinear refractive index of Nd3+:SBN laser crystals

Cited by 13 publications

References 12 publications

Nonlinear refraction and absorption through phase transition in a Nd:SBN laser crystal

Nonlinear refraction and absorption through phase transition in a Nd:SBN laser crystal

Thermo-optical and spectroscopic properties of Nd:YAG fine grain ceramics: towards a better performance than the Nd:YAG laser crystals

Evidence of phase transition in Nd3+doped phosphate glass determined by thermal lens spectrometry

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Evidence of phase transition in Nd³⁺doped phosphate glass determined by thermal lens spectrometry