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Optics Letters

Optics Letters


  • Vol. 27, Iss. 20 — Oct. 15, 2002
  • pp: 1755–1757

Continuous-wave photothermal deflection spectroscopy with fundamental and harmonic responses

Jianhua Zhao, Jun Shen, and Cheng Hu  »View Author Affiliations

Optics Letters, Vol. 27, Issue 20, pp. 1755-1757 (2002)

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A diffraction theory of continuous-wave photothermal deflection (PD) spectroscopy with fundamental and harmonic responses is presented. The displacement of the probe beam centroid is found to be a rigorous measurement of PD effect, which leads to a set of analytical solutions to the fundamental and the second-order harmonics. Harmonics are caused by the diffraction of the probe beam in the mirage region, which could not be handled by geometric-optics theory. This theory can be used to study bulk materials, thin films, and layered-structure samples. Experimental results are in good agreement with the theory.

© 2002 Optical Society of America

OCIS Codes
(050.1960) Diffraction and gratings : Diffraction theory
(070.4340) Fourier optics and signal processing : Nonlinear optical signal processing
(350.5340) Other areas of optics : Photothermal effects

Jianhua Zhao, Jun Shen, and Cheng Hu, "Continuous-wave photothermal deflection spectroscopy with fundamental and harmonic responses," Opt. Lett. 27, 1755-1757 (2002)

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