Optimizing and calibrating a mode-mismatched thermal lens experiment for low absorption measurement

Marcano, Arı́stides; Cabrera, Humberto; Guerra, Mayamarú; Cruz, R. A.; Jacinto, Carlos; Catunda, T.

doi:10.1364/josab.23.001408

Cited by 69 publications

(51 citation statements)

References 13 publications

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“…͑2͒ is used to fit the experimental data in order to determine the parameters and t c . The optimized TLS configuration, 9 however, allows obtaining without requiring such fits. In this case, the probe beam is much wider than the excitation's, and their waists are at the same position.…”

Section: ͑2͒mentioning

confidence: 99%

“…2 In our view, the main drawback of this configuration is that the results depend critically on the beam waists, their values and positions, which results in the major source of experimental uncertainty. Recently, Marcano et al 9 presented another mode-mismatched dual-beam TLS configuration, which optimizes the technique and requires no calibration since the results does not depend critically on the beam parameters. Besides that, the sensitivity is improved 10 because large samples can be used ͑up to 100 cm was demonstrated͒.…”

Section: Introductionmentioning

confidence: 99%

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Quantum yield excitation spectrum (UV-visible) of CdSe/ZnS core-shell quantum dots by thermal lens spectrometry

Cruz

Pilla

Catunda

2010

Journal of Applied Physics

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A recently developed thermal lens spectrometry configuration has been used to study CdSe/ZnS core-shell quantum dots ͑QDs͒ suspended in toluene and tetrahydrofuran ͑THF͒ solvents. The special features of this configuration make it very attractive to measure fluorescence quantum yield ͑͒ excitation spectrum since it simplifies the measurement procedure and consequently improve the accuracy. Furthermore, the precision reached is much higher than in conventional photoluminescence ͑PL͒ technique. Two methods, called reference sample and multiwavelength have been applied to determine , varying excitation wavelength in the UV-visible region ͑between 335-543 nm͒. The and PL spectra are practically independent of the excitation wavelength. For CdSe/ZnS QDs suspended in toluene we have obtained =76Ϯ 2%. In addition, the aging effect on and PL has been studied over a 200 h period for QDs suspended in THF.

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Section: ͑2͒mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quantum yield excitation spectrum (UV-visible) of CdSe/ZnS core-shell quantum dots by thermal lens spectrometry

Cruz

Pilla

Catunda

2010

Journal of Applied Physics

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“…An alternative technique for measuring low absorption values is the thermal lens (TL) method. TL spectrometry is a photo-thermal technique which has been widely used for the determination of absorption of different materials with high sensitivity and versatility [5][6][7][8][9][10]. Since its discovery in 1964 the method has been used for the intracavity measurements of absorption of nearly transparent materials [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…Marcano et al have developed a simple calibrated TL method for measuring low absorption values based on a pump-probe scheme with a collimated probe beam and a focused pump beam [7][8][9]. The method not only optimizes the TL response but also allows a simple calibration and simple data interpretation.…”

Section: Introductionmentioning

confidence: 99%

Absorption coefficient of nearly transparent liquids measured using thermal lens spectrometry

Cabrera¹,

Marcano²,

Castellanos³

2006

Condens. Matter Phys.

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“…In a stationary situation ͑t → ϱ͒, for z = 0 and collimating the probe beam, Eq. ͑3͒ simplifies to 7,9 S totalϱ = P e ␣l…”

Section: ͑5͒mentioning

confidence: 99%

Thermal lens measurement of the Soret coefficient in acetone/water mixtures

Cabrera

Martı́-López²,

Sira³

et al. 2009

The Journal of Chemical Physics

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The Soret coefficient of acetone/water mixtures has been experimentally determined by a recently developed thermal lens technique ͓Appl. Phys. Lett. 94, 051103 ͑2009͔͒. The behavior of the Soret coefficient was reproduced, including its sign change with composition. For concentrations around the equimolar ones, we have also confirmed the disagreement between the experimental and simulation data that had previously been reported by Ning and Wiegand ͓J. Chem. Phys. 125, 221102 ͑2006͔͒ using a transient holographic grating technique of thermal diffusion forced Rayleigh scattering. Additionally, we compare our experimental results with the theoretical values predicted by a recently developed viscous energy model ͓J. Chem. Phys. 130, 064506 ͑2009͔͒.

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Optimizing and calibrating a mode-mismatched thermal lens experiment for low absorption measurement

Cited by 69 publications

References 13 publications

Quantum yield excitation spectrum (UV-visible) of CdSe/ZnS core-shell quantum dots by thermal lens spectrometry

Quantum yield excitation spectrum (UV-visible) of CdSe/ZnS core-shell quantum dots by thermal lens spectrometry

Absorption coefficient of nearly transparent liquids measured using thermal lens spectrometry

Thermal lens measurement of the Soret coefficient in acetone/water mixtures

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