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Temperature dependence of the photothermal laser cooling efficiency for a micro-cantilever |
Ding Li-Ping (丁丽萍)a b, Mao Tian-Hua (毛添华)a b, Fu Hao (付号)a, Cao Geng-Yu (曹更玉)a |
a State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institution of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;
b University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract The relationship between the photothermal cooling efficiency of a micro-cantilever's mechanical mode and the environmental temperature is studied. The micro-cantilever and a polished fiber end form a low finesse Fabry-Perot (FP) cavity. Experimental results in a temperature range from 77 K to 298 K show that temperature has an obvious influence on photothermal cooling efficiency. The photothermal cooling efficiency, η ph, at 100 K is 10 times that at 298 K. This accords well with the theoretical analysis that the high photothermal cooling efficiency can be achieved when photothermal response time, τph, and mechanical resonant frequency, ω0, are close to the optimal photothermal cooling condition ω0 τph=1. Our study provides an important approach for high effective photothermal cooling and high-sensitivity measurement for force microscopy.
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Received: 04 April 2014
Revised: 30 May 2014
Accepted manuscript online:
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PACS:
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78.20.nb
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(Photothermal effects)
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42.60.-v
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(Laser optical systems: design and operation)
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42.55.Sa
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(Microcavity and microdisk lasers)
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Fund: Project supported by the National Basic Research Program of China (Grant No. 2012CB922101). |
Corresponding Authors:
Cao Geng-Yu
E-mail: gycao@wipm.ac.cn
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About author: 78.20.nb; 42.60.-v; 42.55.Sa |
Cite this article:
Ding Li-Ping (丁丽萍), Mao Tian-Hua (毛添华), Fu Hao (付号), Cao Geng-Yu (曹更玉) Temperature dependence of the photothermal laser cooling efficiency for a micro-cantilever 2014 Chin. Phys. B 23 107801
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