Raman thermometry: Effective temperature of the nonuniform temperature field induced by a Gaussian laser

Journal Article · Mon Dec 21 00:00:00 EST 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4937904· OSTI ID:22493045

Očenášek, Jan; Voldřich, Josef ^[1]

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1. New Technologies Research Centre, University of West Bohemia in Pilsen, Plzeň 30614 (Czech Republic)

Raman spectroscopy is a widely applied analytical technique with numerous applications that is based on inelastic scattering of monochromatic light, which is typically provided by a laser. Irradiation of a sample by a laser beam is always accompanied by an increase in the sample temperature, which may be unwanted or may be beneficial for studying temperature-related effects and determining thermal parameters. This work reports analyses of the temperature field induced by a Gaussian laser to calculate the Raman scattered intensity related to each temperature value of the nonuniform field present on the sample. The effective temperature of the probed field, calculated as an average weighted by the laser intensity, is demonstrated to be about 70% of the maximum temperature irrespective of the absorption coefficient or the laser focus. Finally, using crystalline silicon as a model material, it is shown that this effective value closely approximates the temperature value identified from the thermally related peak shift.

• OSTI ID: 22493045
• Journal Information: Journal of Applied Physics, Vol. 118, Issue 23; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ABSORPTION
CRYSTAL STRUCTURE
INELASTIC SCATTERING
LASER RADIATION
LASERS
MONOCHROMATIC RADIATION
RAMAN SPECTROSCOPY
SILICON
TEMPERATURE DEPENDENCE
TEMPERATURE MEASUREMENT
VISIBLE RADIATION