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Measurement of localized heating in the focus of an optical trap

2000; Optica Publishing Group; Volume: 39; Issue: 19 Linguagem: Inglês

10.1364/ao.39.003396

0003-6935

P. M. Celliers, Jérôme Conia,

Quantum Information and Cryptography

Localized heating in the focus of an optical trap operating in water can result in a temperature rise of several kelvins. We present spatially resolved measurements of the refractive-index distribution induced by the localized heating produced in an optical trap and infer the temperature distribution. We have determined a peak temperature rise in water of 4 K in the focus of a 985-nm-wavelength 55-mW laser beam. The localized heating is directly proportional to power and the absorption coefficient. The temperature distribution is in excellent agreement with a model based on the heat equation.