Collinear photothermal deflection spectroscopy with light-scattering samples

Spear, Jonathan D.; Russo, Richard E.; Silva, Robert J.

doi:10.1364/ao.29.004225

Cited by 38 publications

(21 citation statements)

References 14 publications

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“…The fluorescence signal is subsequently detected by an optical spectrum analyzer. For a measurement of the temperature change in the gas cell induced by the cooling beam, we employed thermal deflection spectroscopy [17,18]. For this measurement of the cooling, the Ti:sapphire laser was tuned to a wavelength of 785 nm, far to the red of the unperturbed potassium D-lines (that is 766 nm and 770 nm, for the D2-and D1lines respectively).…”

Section: Methodsmentioning

confidence: 99%

Laser cooling of a potassium–argon gas mixture using collisional redistribution of radiation

2011

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We study laser cooling of atomic gases by collisional redistribution, a technique applicable to ultradense atomic ensembles at a pressure of a few hundred bar. Frequent collisions of an optically active atom with a buffer gas shift atoms into resonance with a far red detuned laser beam, while spontaneous decay occurs close to the unperturbed resonance frequency. In such an excitation cycle, a kinetic energy of the order of the thermal energy k B T is extracted from the sample. Here we report of recent experiments investigating the cooling of a potassiumargon gas mixture, which compared to an rubidium-argon mixture investigated in earlier experiments has a smaller fine structure of the optically active alkali atom. We observe a relative cooling of the potassium-argon gas mixture by 120 K.

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Section: Methodsmentioning

confidence: 99%

Laser cooling of a potassium–argon gas mixture using collisional redistribution of radiation

2011

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“…This can be performed by solving the temperature gradient developed in a beam deflection model. 21) In the present setup the equations for heat conduction in the wire, fluid, and nanoparticles are established using a cylindrical coordinate system in dimensionless forms as 1 @u w ðr; Þ @ ¼ @ 2 u w ðr; Þ @r 2 þ 1 r @u w ðr; Þ @r þ gðr; Þ; ð1Þ…”

Section: Thermal and Laser Beam Displacement Modelsmentioning

confidence: 99%

Study of the Effect of Volume Fraction Concentration and Particle Materials on Thermal Conductivity and Thermal Diffusivity of Nanofluids

Ali

Yunus

2011

Jpn. J. Appl. Phys.

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Nanofluids, a mixture of nanoparticles and fluids, have exceptional potential to improve their effective thermal conductivity and thermal diffusivity, aluminum and aluminum oxide nanofluids with five different volume fractions of nanoparticle suspensions in different base fluids, i.e., distilled water, ethylene glycol (EG), and ethanol were prepared by mixing nanopowder and base fluids. Sonication with high-powered pulses was used to ensure the dispersion of nanoparticles in good uniformity in the base fluids. The hot wire-laser beam displacement technique was used to measure thermal conductivity and thermal diffusivity of the prepared nanofluids. The effects of the volume fraction concentration and particle materials on the thermal conductivity and thermal diffusivity of nanofluids were determined. The results showed that the thermal conductivity and thermal diffusivity increased linearly with increasing volume fraction concentration of nanoparticles in the respective base fluids. In addition, the thermal conductivity and thermal diffusivity increased faster in the Al 2 O 3 nanofluids than in all the three base fluids.

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“…The 1D approximation requires the condition of the probe beam radius to be much smaller than the excitation beam radius [16]. Then, each part of the PB interacts with approximately the same thermal gradients and undergoes the same deflection [17].…”

Section: Methodsmentioning

confidence: 99%

Application of complex geometrical optics to determination of thermal, transport, and optical parameters of thin films by the photothermal beam deflection technique

Korte

Franko

2014

J. Opt. Soc. Am. A

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In this work, complex geometrical optics is, for what we believe is the first time, applied instead of geometrical or wave optics to describe the probe beam interaction with the field of the thermal wave in photothermal beam deflection (photothermal deflection spectroscopy) experiments on thin films. On the basis of this approach the thermal (thermal diffusivity and conductivity), optical (energy band gap), and transport (carrier lifetime) parameters of the semiconductor thin films (pure TiO2, N- and C-doped TiO2, or TiO2/SiO2 composites deposited on a glass or aluminum support) were determined with better accuracy and simultaneously during one measurement. The results are in good agreement with results obtained by the use of other methods and reported in the literature.

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Collinear photothermal deflection spectroscopy with light-scattering samples

Cited by 38 publications

References 14 publications

Laser cooling of a potassium–argon gas mixture using collisional redistribution of radiation

Laser cooling of a potassium–argon gas mixture using collisional redistribution of radiation

Study of the Effect of Volume Fraction Concentration and Particle Materials on Thermal Conductivity and Thermal Diffusivity of Nanofluids

Application of complex geometrical optics to determination of thermal, transport, and optical parameters of thin films by the photothermal beam deflection technique

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