Collinear photothermal deflection spectroscopy with light scattering samples

Journal Article · Mon Oct 01 04:00:00 EDT 1990 · Applied Optics; (USA)

DOI:https://doi.org/10.1364/AO.29.004225· OSTI ID:5953766

Spear, J D; Russo, R E ^[1]; Silva, R J ^[2]

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1. Lawrence Berkeley Laboratory, Berkeley, CA (USA)
2. Lawrence Livermore National Laboratory, Livermore, CA (USA)

An analytical model that incorporates effects of light scattering was developed for dual beam photothermal deflection spectroscopy. Thermal gradients induced by a modulated excitation beam deflect an optical probe beam which was treated as being of finite dimensions. Mechanisms by which thermal gradients produce refractive index gradients are discussed, with an explicit expression for {ital dn}/{ital dT} being derived. Experimental studies with suspensions of small latex particles in Nd{sup 3+} solutions demonstrated that the model accurately predicts both the shape of the deflection signal and the attenuation of the signal due to light scattering. The absolute magnitude of the observed signal is approximately predicted by theory.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5953766
• Journal Information: Applied Optics; (USA), Journal Name: Applied Optics; (USA) Vol. 29:28; ISSN 0003-6935; ISSN APOPA
• Country of Publication: United States
• Language: English

Related Subjects

440600* -- Optical Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
ABSORPTION
DIFFUSION
ELASTOMERS
LATEX
LIGHT SCATTERING
OPTICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PHYSICAL PROPERTIES
POLYMERS
REFRACTIVITY
RUBBERS
SCATTERING
SPECTROSCOPY
TEMPERATURE GRADIENTS
THERMAL CONDUCTIVITY
THERMAL DIFFUSION
THERMODYNAMIC PROPERTIES