Special Section on Practical Holography: New Procedures, Materials, and Applications

Integrated digital holography for measuring the photothermal effect induced by femtosecond laser pulses

[+] Author Affiliations
Linwei Zhu

Ludong University, School of Physics and Optoelectronic Engineering, Yantai 264025, China

Meiyu Sun

Ludong University, School of Physics and Optoelectronic Engineering, Yantai 264025, China

Jiannong Chen

Ludong University, School of Physics and Optoelectronic Engineering, Yantai 264025, China

Junjie Yu

Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Laboratory of Information Optics and Optoelectronics Technology, P.O. Box 800-216, Shanghai 201800, China

Changhe Zhou

Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Laboratory of Information Optics and Optoelectronics Technology, P.O. Box 800-216, Shanghai 201800, China

Opt. Eng. 53(11), 112311 (May 09, 2014). doi:10.1117/1.OE.53.11.112311
History: Received January 26, 2014; Revised March 29, 2014; Accepted April 17, 2014
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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.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Linwei Zhu ; Meiyu Sun ; Jiannong Chen ; Junjie Yu and Changhe Zhou
"Integrated digital holography for measuring the photothermal effect induced by femtosecond laser pulses", Opt. Eng. 53(11), 112311 (May 09, 2014). ; http://dx.doi.org/10.1117/1.OE.53.11.112311


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