Instrumentation, Techniques, and Measurement

Photothermal camera port accessory for microscopic thermal diffusivity imaging

[+] Author Affiliations
Facundo Zaldívar Escola, Nelly Mingolo, Oscar Eduardo Martínez

Universidad de Buenos Aires, Facultad de Ingeniería, Paseo Colón 850, Buenos Aires 1063, Argentina

Darío Kunik

Tolket S.R.L., Av. Gral. Las Heras 3923, Of. 6E, Buenos Aires 1425, Argentina

Opt. Eng. 55(6), 064110 (Jun 28, 2016). doi:10.1117/1.OE.55.6.064110
History: Received March 4, 2016; Accepted June 3, 2016
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Abstract.  The design of a scanning photothermal accessory is presented, which can be attached to the camera port of commercial microscopes to measure thermal diffusivity maps with micrometer resolution. The device is based on the thermal expansion recovery technique, which measures the defocusing of a probe beam due to the curvature induced by the local heat delivered by a focused pump beam. The beam delivery and collecting optics are built using optical fiber technology, resulting in a robust optical system that provides collinear pump and probe beams without any alignment adjustment necessary. The quasiconfocal configuration for the signal collection using the same optical fiber sets very restrictive conditions on the positioning and alignment of the optical components of the scanning unit, and a detailed discussion of the design equations is presented. The alignment procedure is carefully described, resulting in a system so robust and stable that no further alignment is necessary for the day-to-day use, becoming a tool that can be used for routine quality control, operated by a trained technician.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Facundo Zaldívar Escola ; Darío Kunik ; Nelly Mingolo and Oscar Eduardo Martínez
"Photothermal camera port accessory for microscopic thermal diffusivity imaging", Opt. Eng. 55(6), 064110 (Jun 28, 2016). ; http://dx.doi.org/10.1117/1.OE.55.6.064110


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