Dodge, "Refractive Index" in Handbook of Laser Science and Technology, Volume IV, Optical Materials: Part 2, CRC Press, Boca Raton, 1986, p. 30 * Ref. An apparatus is described for measuring the index of refraction as a function of temperature throughout the visible wavelength region. 4 0 obj <> 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 … Sapphire is a very useful optical window material for use in the UV, visible, and near infra-red. Index vs temperature data were analyzed (using minimum chi^2 fits) by fitting the data to a three term Sellmeir equation^ {30}. (or is it just me...), Smithsonian Privacy 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�����=$2��>y�_?yq�����ݖ�� ���=���Q��~�ɋO���Wo��g�ެ�x�K���q�����@p��z������w�_��=�|�5?�x;�M>=�_��F��ӿ��W��7߼�o�}\���{,G����ˣ�p7�Z�}��^Ğ�����B���:���^�Qޣ��������_��1?�r��G� ��t�vz��߾|�O?��o꭛&�T�iI���������[�c�������n����P~���̉��@'���wGs>���k9�'T��~3��B�s��'E�t��Ozb O�>�qc��������i ��M��ʍOW����ͥ�>]�ܟ��X]����ʱ�VR{J�����f�N�y|����?����e~x�X^����}�j��P�{�����9v���������z�k�����c��su Transmission of optical grade sapphire ranges from 0.15 to 5 microns wavelength. ��)��c���o}8�S~�{�ݣk�^�����_�xs;���oz��%������y�K��K��k}7z������n�0��w�Ǥ;�����F�~���|�-��g����C$=����f�b�h�>JyL�|lQ�#��Z��o����7���l��1w��=��^�Y���%�̼K}*��ˬ�e�]z���_��7��u���׷G�-�89|�)����_~�ۄ�{�?��l$I6����]��o�_�|$���]/�u�(�?��v�{�?���㷸�QY�s�t�O�'w���Ǡ�Lw��뵌�>�s�7�O��'����~};����`�Nj�u}>��S�^��߽����ߎ��c~�ͫ1?�ztn�ˮ]var�����y��SL�����}v������yE9��y%�u����Weݸ[��ΑOw���u���w��o�{��8�}=���q�;��?Ⱦޏv��G;�}/m��z�����/6&������t��E��?�_^c�~��oǾ������gxh�M�3=�el~l��໏6ُ 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 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. The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Refractive Index and Birefringence of Synthetic Sapphire, J. Opt. Use, Smithsonian GaN, Wurtzite. It is a constant that is measurable to four significant figures (i.e. 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. (1997) GaN, Wurtzite sructure. %PDF-1.5 The index of refraction for ruby for an extraordinary ray is 1.76 and for an ordinary ray is 1.77. The ordinary ray, a beam of light that doesn't vary in wavelength, enters ruby with an index of refraction of 1.770. 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. Refractive index n versus wavelength on sapphire at 300 K Yu et al. <>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 540 780] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> Soc. Each material in the database has refractive index listed as a function of wavelength over a range typically required for thin-film thickness measurement. Refractive index sapphire is defined as the speed of light in a vacuum divided by the speed of light in sapphire. 3 0 obj 2 0 obj 62, 1405 (1972) 2) M. J. Refractive Index Database The table below contains links to refractive index data for common materials. Notice, Smithsonian Terms of v=fλ where f is the frequency λ is the 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. 1 0 obj Note that this λ is the vacuum wavelength, not that in the material itself, which is λ/n. stream Open source for use with acknowledgement.

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