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Optical Engineering

Integrated digital holography for measuring the photothermal effect induced by femtosecond laser pulses
Author(s): Linwei Zhu; Meiyu Sun; Jiannong Chen; Junjie Yu; Changhe Zhou
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Paper Abstract

Thermal lens (TL) and thermal mirror (TM) effects have been widely used for measuring the thermo-optical properties in materials. However, most previous research is not a direct two-dimensional measurement of the phase difference induced by photothermal effects, and the TL and TM effects cannot be measured simultaneously. We present an integrated digital holography (IDH) for measuring photothermal effects induced by femtosecond laser pulses with the laser excitation fluence below the ablation threshold. The photothermal effects of a metal sample induced by femtosecond laser pulses are studied. Our theoretical analysis reveals that when the energy of the femtosecond laser is below the ablation threshold, the theory of heat conduction and thermoelasticity can be used to explain the TL and TM effects caused by the laser-induced nonuniform temperature distribution. The experimental results show that both the nanoscale surface deformation of the TM effect and the refraction index change of the TL effect can be measured simultaneously by using the IDH. This IDH setup could be suitable for measuring the optical and thermal properties of materials.

Paper Details

Date Published: 9 May 2014
PDF: 8 pages
Opt. Eng. 53(11) 112311 doi: 10.1117/1.OE.53.11.112311
Published in: Optical Engineering Volume 53, Issue 11
Show Author Affiliations
Linwei Zhu, Ludong Univ. (China)
Meiyu Sun, Ludong Univ. (China)
Jiannong Chen, Ludong Univ. (China)
Junjie Yu, Shanghai Institute of Optics and Fine Mechanics (China)
Changhe Zhou, Shanghai Institute of Optics and Fine Mechanics (China)

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