Dodge, "Refractive Index" in Handbook of Laser Science and Technology, Volume IV, Optical Materials: Part 2, CRC Press, Boca Raton, 1986, p. 30 * Ref. x���ݮ]�u�� ��U� �ز�8��n[������ev��#�I���&�׫j�Q�F�yL�bC��9ƮUs�Ϫ��!y��׷�>��W_��g����~��/n��ɋ���t��] ��R��J�߾{�ɋ���7��p�����=$2��>y�_?yq�����ݖ�� ���=���Q��~�ɋO���Wo��g�ެ�x�K���q�����@p��z������w�_��=�|�5?�x;�M>=�_��F��ӿ��W��7߼�o�}\���{,G����ˣ�p7�Z�}��^Ğ�����B���:���^�Qޣ��������_��1?�r��G� ��t�vz��߾|�O?��o꭛&�T�iI���������[�c�������n����P~���̉��@'���wGs>���k9�'T��~3��B�s��'E�t��Ozb O�>�qc��������i ��M��ʍOW����ͥ�>]�ܟ��X]����ʱ�VR{J�����f�N�y|����?����e~x�X^����}�j��P�{�����9v���������z�k�����c��su Soc. The refractive index of α-Al 2 O 3 is modeled with reasonable accuracy from room temperature to the melting temperature and from the microwave to the ultraviolet for both the o-ray and e-ray. Wavelength (µm) Sapphire Refractive Index (n) vs Wavelength (λ) Wavelength (µm) n o n e 0.193 1.9288 1.9174 0.213 1.8890 1.8784 0.222 1.8754 1.8650 0.226 1.8702 1.8599 0.244 1.8506 1.8407 0.248 1.8470 1.8372 0.257 1.8393 1.8297 0.266 1.8330 1.8236 0.280 … These coefficients are usually quoted for λ in micrometres. Sapphire Properties: Thermal, Electrical and Optical IR Transmission Vs Wavelength 500°C 20°C 1000°C 0 0 2 3 4 5 6 10 20 30 40 50 60 70 80 90 100 Wavelengths, Microns The index of refraction is a ratio; if a wavelength of one wave is different from that of another wave passing through the same medium, the index of refraction should not be different for each wave, since they would have had different wavelengths in a vacuum too. Each material in the database has refractive index listed as a function of wavelength over a range typically required for thin-film thickness measurement. Although excellent fits were made to the data no definitive reason could be given to account for the differences in index between the two samples of sapphire. The model allowed for the extraction of the physical constraints: average band gap energy, change in average band gap energy with respect to temperature, plasma energy, and the change in index with respect to pressure for sapphire. %���� stream ♦ Sapphire IR Transmission data table ©2019. Sapphire Properties: Thermal, Electrical and Optical IR Transmission Vs Wavelength 500°C 20°C 1000°C 0 0 2 3 4 5 6 10 20 30 40 50 60 70 80 90 100 Wavelengths, Microns <>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 540 780] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> The index of refraction for ruby for an extraordinary ray is 1.76 and for an ordinary ray is 1.77. 62, 1405 (1972) 2) M. J. It is a constant that is measurable to four significant figures (i.e. Transmission of optical grade sapphire ranges from 0.15 to 5 microns wavelength. The apparatus has an accuracy of 1 times 10^{ -4} in determining the index and has the flexibility to be modified to measure indices at non-visible wavelengths. endobj 4 0 obj Table shows values from 265 NM to 5.5 microns. (or is it just me...), Smithsonian Privacy The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative The nonlinear refractive index, n2, of sapphire was experimentally measured in the 550-1550-nm wavelength range by use of a picosecond Z-scan technique. v is the velocity of light in the medium. Am. An apparatus is described for measuring the index of refraction as a function of temperature throughout the visible wavelength region. 2 provides a dispersion formula. Use, Smithsonian ♦ Sapphire (Al 2 O 3) Data Sheet ♦ Sapphire (Al 2 O 3) SDS ♦ Sapphire (Al 2 O 3) Rough Guide. A different form of the equation is sometimes used for certain types of materials, e.g. <> The refractive index of a gemstone provides the single most important piece of information to a gemologist seeking to identify an unknown stone. Refractive index n = c/v where c is the velocity of light in vacuum. Reflectance R as a function of photon energy for single crystals (platelets). }�c����Q����#|�!3��Q��_0���������r��\:�����W�yH�ͫ�y����}]���#�#�g:�������ϯ��|��. Refractive index [ i ] n = 1.7682 Wavelength, µm n, k 1 2 3 4 5 1.55 1.6 1.65 1.7 1.75 1.8 1.85 RefractiveIndex.INFO Al2O3 (Aluminium sesquioxide, Sapphire, Alumina) Malitson 1962: α-Al2O3 … Sapphire is used for its extreme toughness and strength. Index vs temperature data were fitted to a model based on the one given by Tsay, Bendow, and Mitra^{39}. 1 0 obj The ordinary ray, a beam of light that doesn't vary in wavelength, enters ruby with an index of refraction of 1.770. ��;�qj��8�|=���o:|u{��ة��F��7?�����?���v���Ha|�����}���z�t�É����~���査��+m�΀�=��Џ=b��6k}R��Q>jx��>���qly�W�� H����'��d��#�s:��K]6z�M���}���7��8~�g�sL�އr��긬���5}�{���]O,������S�v����a,�o����d�]��w�,O��x��{G9|���z����N��r�>j��n�w͏��}݋ך��������1���������~l¶z�c����{t���������Ma�u}�x��a�uLc������U��.]?j��ᇅ���a�����H�LV_����?��>����O7>�;��Q��e�~�b����8"_�4? Astrophysical Observatory, Physics: Optics; Physics: Condensed Matter. Its performance and theory of operation are discussed. One sample was grown by a heat exchanger method, and the other by an edge-defined film -fed growth technique. Since sapphire is an important mid-ir window material, the temperature dependence of the refractive index needs to be known. 3 0 obj The index of refraction for sapphire is sapphire is 1.77. Agreement NNX16AC86A, Is ADS down? Refractive index n versus wavelength on sapphire at 300 K Yu et al. Open source for use with acknowledgement. %PDF-1.5 Refractive index sapphire is defined as the speed of light in a vacuum divided by the speed of light in sapphire. endobj Notice, Smithsonian Terms of Note that this λ is the vacuum wavelength, not that in the material itself, which is λ/n. The measurements at a given temperature and wavelength revealed differences in index between the two samples. 1 is a talk abstract in a conference program; Ref. For non-magnetic material (relative permeability of medium is equal to unit), the dielectric constant will be equal to square of refractive index. (1997) GaN, Wurtzite sructure. endobj Long-wavelength refractive index normalized to the 0 K value vs. temperature. Synthetic Sapphire; Quartz Glass for Optics; Synthetic Crystal Quartz; KBr (Potassium Bromide) Silicon; Germanium; CVD - ZnSe; CVD-ZnS; CaF2 (Calcium Fluoride) BaF2 (Barium Fluoride) KCl (Potassium Chloride) NaCl (Sodium Chloride) Materials for Mirrors; Materials for Non-linear Optics 3 decimal points) and can allow gems to be distinguished even when their … Index vs temperature data were analyzed (using minimum chi^2 fits) by fitting the data to a three term Sellmeir equation^ {30}. Refractive Index and Birefringence of Synthetic Sapphire, J. 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