光阱焦点处局部加热的测量。

Measurement of localized heating in the focus of an optical trap.

作者信息

Celliers P M, Conia J

机构信息

Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550, USA.

出版信息

Appl Opt. 2000 Jul 1;39(19):3396-407. doi: 10.1364/ao.39.003396.

DOI:10.1364/ao.39.003396

PMID:18349909

Abstract

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.

摘要

在水中运行的光阱焦点处的局部加热可导致温度升高几开尔文。我们展示了由光阱中产生的局部加热引起的折射率分布的空间分辨测量结果，并推断出温度分布。我们已经确定，在波长为985 nm、功率为55 mW的激光束焦点处，水中的峰值温度升高为4 K。局部加热与功率和吸收系数成正比。温度分布与基于热方程的模型高度吻合。