Laser-induced thermal lens effect: a new theoretical model

Sheldon, Sallie; Knight, Larry V.; Thorne, James M.

doi:10.1364/ao.21.001663

Cited by 391 publications

(230 citation statements)

References 5 publications

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“…The proposed technique is based upon the use of the thermal lens ͑TL͒ technique. [18][19][20] The thermal lens effect was first observed by Gordon et al, 18 and it consists basically on the observation of the changes induced in the refractive index of a sample as it is heated by an incident laser beam. The energy absorbed by the sample is converted, in part or in whole, into heat by nonradiative deexcitation processes.…”

Section: Introductionmentioning

confidence: 99%

Thermal lens scanning of the glass transition in polymers

Rohling

Caldeira

Pereira

et al. 2001

Journal of Applied Physics

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In this article we discuss the use of the thermal lens technique for investigating the thermal properties of polymers as a function of temperature. It is also discussed how the experimentally determined thermal lens parameters can be used to locate the glass transition in polymers. The methodology is tested using a solution casted films of poly͑vinyl chloride͒ as a testing sample. A comparison with conventional differential scanning calorimetry data is made. It is proposed that the current transient thermal lens methodology, with minor changes in its experimental configuration, could be adapted to develop a new methodology called differential thermal lens scanning especially designed for the investigation of the phase transitions in polymers. It is shown that this new methodology could be equally used for the measurement of the thermal expansion coefficient, above and below the glass transition.

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Section: Introductionmentioning

confidence: 99%

Thermal lens scanning of the glass transition in polymers

Rohling

Caldeira

Pereira

et al. 2001

Journal of Applied Physics

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“…Commonly, the light absorbed in a related nonlinear crystal turns to heat which enhances the temperature inside. This local temperature rising causes a relative change of refractive indices, destructs the phase-matching (PM) condition and lowers the conversion efficiency [1][2][3]. In a common frequency conversion process, such as second harmonic generation (SHG), the thermo-optic coupling effect is generally unable to be avoided without cooling, especially in the infrared range.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the thermo-optic coupling effect in mid-infrared second harmonic generation of ZnGeP₂ crystal

Zhang

Gao

Huang

et al. 2015

Materials Science-Poland

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The thermo-optic coupling process of second harmonic generation was numerically simulated in ZnGeP 2 crystals pumped by a pulsed CO 2 laser at the wavelength of 9.6 µm, under the strong and weak cooling conditions. The conversion efficiencies, temperature distributions were calculated during the evolution of the thermo-optic coupling. The results showed that the thermooptic coupling was weak in the strong cooling condition, which nearly did not disturb the conversion processes and temperature distribution, while in the weak cooling case, the temperature distribution showed a great influence on the conversion efficiency and light intensity. Finally, it was found that compensation of the phase mismatch induced by the thermal effect can well recover the conversion efficiency.

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“…The nitroanisole exhibits a thermal lens effect [9][10][11][12], i.e. a temperature dependent refractive index, and it absorbs IR radiation as heat.…”

Section: Introductionmentioning

confidence: 99%

Numerical reconstruction of an infrared wavefront utilizing an optical phase modulation device

Miyamoto

Nisiyama

Tomioka

et al. 2007

Optics Communications

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We utilize nitroanisole, that absorbs infrared(IR) radiation as heat, as an optical modulation device based on a thermal process. The nitroanisole exhibits a thermal lens effect, i.e. a temperature dependent refractive index. Hence, the nitroanisole can induce phase modulation to visible light, in direct response to intensity of the incident IR radiation. The proposed method can be used to obtain the phase modulation distribution that corresponds to the IR intensity distribution, i.e. the IR hologram itself, on the nitroanisole by examining the phase map of visible light that is modulated upon passing through the nitroanisole. The IR wavefront can be reconstructed by calculating extracted IR holograms through the Fresnel transform.It is verified that both the amplitude and the phase of the IR wavefront can be reconstructed accurately by proposed method.

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Laser-induced thermal lens effect: a new theoretical model

Cited by 391 publications

References 5 publications

Thermal lens scanning of the glass transition in polymers

Thermal lens scanning of the glass transition in polymers

Simulation of the thermo-optic coupling effect in mid-infrared second harmonic generation of ZnGeP₂ crystal

Numerical reconstruction of an infrared wavefront utilizing an optical phase modulation device

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Laser-induced thermal lens effect: a new theoretical model

Cited by 391 publications

References 5 publications

Thermal lens scanning of the glass transition in polymers

Thermal lens scanning of the glass transition in polymers

Simulation of the thermo-optic coupling effect in mid-infrared second harmonic generation of ZnGeP2 crystal

Numerical reconstruction of an infrared wavefront utilizing an optical phase modulation device

Contact Info

Product

Resources

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Simulation of the thermo-optic coupling effect in mid-infrared second harmonic generation of ZnGeP₂ crystal