Pulsed photothermal deflection with a top-hat beam excitation

Li, Bincheng; Blaschke, Holger; Ristau, Detlev

doi:10.1063/1.2337253

Cited by 5 publications

(1 citation statement)

References 25 publications

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“…Other prominent measurement methods, for example photothermal surface-displacement techniques [4][5][6] , laser induced deflection 7,8 , photothermal interferometry 9,10 and thermal lensing techniques 11,12 , are very common and exhibit distinct advantages. They are much more suitable for spatially resolved absorption measurements 13 than laser calorimetry, although they do not need physical contact with the sample, which can be important for certain measurements.…”

Section: Introductionmentioning

confidence: 99%

Calibration accuracy of laser calorimetry for common crystal geometries

Willer

Liu

Balasa

et al. 2017

Laser-Induced Damage in Optical Materials 2017

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An established method for precise determination of optical absorption is the so called laser calorimetry. According to ISO 11551 1 laser calorimetry is preferred to other photothermal test methods, because of its capability to deliver absolute calibration. Many optical materials have low heat conductivity, which can affect the calibration significantly. The timeand spatial dependent temperature profile in a sample of materials with low heat conductivity requires accurate temperature measurement strategies to determine material-independent and absolutely calibrated absorption values. For thin cylindrical samples, ISO 11551 provides a strategy to compensate heat conductivity effects. The optimal temperature sensor position, where accordingly calibrated measurement results 2 can be obtained, is simply based on the symmetric sample geometry. For thick geometries an additional temperature distribution along propagation direction of the heating beam must be considered. The current version of ISO 11551 does not provide a sophisticated solution for this problem, because the heating scheme of a sample is usually unknown. Therefore, a reliable calibration procedure can only be applied to samples of well-known absorption properties of surfaces and bulk material. Utilizing such kind of specifically prepared reference samples in combination with Finite Element Method (FEM) calculations, a general measurement and data evaluation concept based on laser calorimetry is presented, that allows deriving absolutely calibrated absorption measurement results for rectangular sample geometries.

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Section: Introductionmentioning

confidence: 99%

Calibration accuracy of laser calorimetry for common crystal geometries

Willer

Liu

Balasa

et al. 2017

Laser-Induced Damage in Optical Materials 2017

Self Cite

View full text Add to dashboard Cite

show abstract

Three-dimensional measurement of laser-induced thermal mirror dynamics using photothermal vortex interferometer with azimuthal phase spectra analysis

Dong,

Li,

Zhao

et al. 2023

Measurement

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Configuration optimization of photothermal deflection for measurement sensitivity enhancement

Zhang

2018

Review of Scientific Instruments

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An accurate theoretical model based on thermoelasticity theory and Fresnel diffraction integral is developed to describe the photothermal deflection (PTD) signal with a continuous-wave modulated Gaussian beam excitation. A PTD experiment is performed to investigate the dependence of PTD amplitude on the experimental parameters, such as the radius, waist position, and wavelength of the probe beam, and the detection distance. Good agreement between the experimental and theoretical results is obtained. The results reveal that the optimal detection distance highly depends on the probe beam waist position and wavelength, and the PTD amplitude can be enhanced by optimizing the probe beam radius and waist position as well as the detection distance. Moreover, it is demonstrated experimentally that the PTD amplitude is inversely proportional to the probe beam wavelength by using three probe lasers with a wavelength of 375 nm, 543 nm, and 632.8 nm. Therefore, the measurement sensitivity of PTD technique could be enhanced by using a short-wavelength probe beam.

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Pulsed photothermal deflection with a top-hat beam excitation

Cited by 5 publications

References 25 publications

Calibration accuracy of laser calorimetry for common crystal geometries

Calibration accuracy of laser calorimetry for common crystal geometries

Three-dimensional measurement of laser-induced thermal mirror dynamics using photothermal vortex interferometer with azimuthal phase spectra analysis

Configuration optimization of photothermal deflection for measurement sensitivity enhancement

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