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Proceedings Paper

Dispersion and temperature dependence of thermo-optic coefficients of optical materials over their whole transparency range: vectorial formalism and application to KTiOPO4
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Paper Abstract

The temperature-dependent dispersion of the refractive index of optical materials is analyzed by introducing an appropriate formulation of what we call their "normalized thermo-optic coefficients" (NTOC). These parameters are obtained experimentally by performing accurate interferometric measurements of both thermal expansion and changes in optical thickness of parallelepipedic shaped samples of millimetric size which are submitted to a linear ramp of temperature. Changes in optical thickness are recorded as function of temperature at a few discrete laser wavelengths; they are expressed as power series of temperature and the use of a simple vectorial formalism allows then to determine the thermal behavior of the dispersion law over the whole transparency range of the material. The validity and reliability of the proposed method has been confirmed by modeling the temperature dependence of the type II second harmonic generation 1.064 μm - 0.532 μm in a KTiOPO4 single crystal, recorded up to 120°C.

Paper Details

Date Published: 25 September 2008
PDF: 9 pages
Proc. SPIE 7102, Optical Fabrication, Testing, and Metrology III, 71020W (25 September 2008); doi: 10.1117/12.804722
Show Author Affiliations
Jacques Mangin, Institut Carnot de Bourgogne, CNRS, Univ. de Bourgogne (France)
Grégory Gadret, Institut Carnot de Bourgogne, CNRS, Univ. de Bourgogne (France)
Gabriel Mennerat, CEA/CESTA (France)

Published in SPIE Proceedings Vol. 7102:
Optical Fabrication, Testing, and Metrology III
Angela Duparré; Roland Geyl, Editor(s)

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