Anomalous effects of ultradilute impurities on heat diffusion in liquids

被引：5

作者：

Ambast, Deepak K. S. ^{[1
]}

Mondal, Richarj ^{[1
]}

Pati, Palas Baran ^{[2
]}

Zade, Sanjio S. ^{[2
]}

Bansal, Bhavtosh ^{[1
]}

Pal, Bipul ^{[1
]}

机构：

[1] Indian Inst Sci Educ & Res Kolkata, Dept Phys Sci, Nadia 741252, W Bengal, India

[2] Indian Inst Sci Educ & Res Kolkata, Dept Chem Sci, Nadia 741252, W Bengal, India

来源：

OPTICS COMMUNICATIONS | 2015年 / 334卷

关键词：

Photothermal effects; Thermal properties of organic solvents; Transient z-scan technique; Anomalous heat diffusion; HIGH-REPETITION-RATE; THERMAL-DIFFUSIVITY; ABSORPTION-MEASUREMENTS; PHASE MODULATION; REFRACTIVE-INDEX; LENS CALORIMETRY; ORGANIC LIQUIDS; SINGLE-BEAM; RATE LASERS; MICROSCOPE;

D O I：

10.1016/j.optcom.2014.08.042

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We analyze the applicability of transient thermal lens (TL) z-scan technique as a sensitive tool to measure heat diffusivity of liquids. Suitable dyes at very low concentrations were added to the host liquid to enhance the TL effect through improved optical absorption. We investigate if these dye impurities, besides improving light absorption, have any effect on the thermal properties of the host liquid. We find that even a trace amount of impurity significantly alters the thermal properties of a solvent. Time-evolution of TL showed pronounced asymmetry about laser focus revealing anomalous behavior in thermal blooming of the laser beam. Heat transport was strongly dependent on the rise in sample temperature by light absorption. Important effects of nonlinear heat transport in time-resolved TL z-scan experiments were revealed. (C) 2014 Elsevier B.V. All rights reserved

引用

页码：184 / 189

页数：6

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