TY - JOUR
T1 - Spatially resolved measurements of thermal stresses by picosecond time-domain probe beam deflection
AU - Cahill, David G.
AU - Zheng, Xuan
AU - Zhao, Ji Cheng
N1 - Funding Information:
This work was supported by the U.S. Department of Energy, Division of Materials Sciences under Award No. DE-FG02-07ER46459, through the Materials Research Laboratory at the University of Illinois at Urbana-Champaign. Experiments were carried out in part in the Frederick Seitz Materials Research Laboratory Central Facilities, University of Illinois, which are partially supported by the U.S. Department of Energy under Grant Nos. DE-FG02-07ER46453 and DE-FG02-07ER46471. JCZ was supported by NSF DMR Grant number 0804833.
PY - 2010/1
Y1 - 2010/1
N2 - 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.
AB - 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.
KW - Coefficient of thermal expansion
KW - Combinatorial materials science
KW - Pump-probe techniques
KW - Ultrafast laser metrology
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U2 - 10.1080/01495730903408690
DO - 10.1080/01495730903408690
M3 - Article
AN - SCOPUS:73849093199
SN - 0149-5739
VL - 33
SP - 9
EP - 14
JO - Journal of Thermal Stresses
JF - Journal of Thermal Stresses
IS - 1
ER -