Spatially resolved measurements of thermal stresses by picosecond time-domain probe beam deflection

David G. Cahill, Xuan Zheng, Ji Cheng Zhao

Research output: Contribution to journalArticle

Abstract

Measurements of thermally induced strains with micron-scale lateral spatial resolution, picosecond time resolution, and sub-picometer vertical sensitivity are achieved using a newly developed experimental method, time-domain probe beam defection (TD-PBD). TD-PBD is a pump-probe optical technique that combines an ultrafast laser oscillator as the light source, high frequency (10MHz) modulation of the pump beam, and a wide range of time delays (0-4ns) between the pump and probe. Deflections of the probe beam are measured by a position sensitive detector and an rf lockin amplifier. The beam-deflection data are analyzed using a detailed model of heat transport and thermally generated stresses and strains. Comparisons between the model and the data enable quantitative measurements of the coefficient of thermal expansion with a spatial resolution of 4m.

Original languageEnglish (US)
Pages (from-to)9-14
Number of pages6
JournalJournal of Thermal Stresses
Volume33
Issue number1
DOIs
StatePublished - Jan 1 2010

Fingerprint

thermal stresses
Thermal stress
deflection
probes
Pumps
pumps
spatial resolution
Ultrafast lasers
Frequency modulation
frequency modulation
Thermal expansion
Light sources
thermal expansion
Time delay
light sources
time lag
amplifiers
oscillators
Detectors
heat

Keywords

  • Coefficient of thermal expansion
  • Combinatorial materials science
  • Pump-probe techniques
  • Ultrafast laser metrology

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Science(all)

Cite this

Spatially resolved measurements of thermal stresses by picosecond time-domain probe beam deflection. / Cahill, David G.; Zheng, Xuan; Zhao, Ji Cheng.

In: Journal of Thermal Stresses, Vol. 33, No. 1, 01.01.2010, p. 9-14.

Research output: Contribution to journalArticle

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