18/Dec/2013 feedback from Chien: I like to use the OPO Op point to calculate the PPLN grating period{ed: Optical Parametric Oscillators on periodically poled lithium niobate}. (Can you bring it back?) Reply: this calculation had been deactivated some time ago because it was not very popular, but has now been brought back per this and other requests. It is now operational again. Thank you for the feedback.

16/Dec/2013 added index of refraction of negative index plasmonic metamaterial thin film with subwavelength nanonotch structures. For the purposes of index calculation on this site, this material is called p1985_6Au_5Kap_8nn, given its unit cell's 1985 nm outside dimension, 6 gold and 5 kapton layers and 8 nanonotches. With this material, designers have engineered a broad flat passband in the 3000 to 3700 nm range with smooth transition of the real index index of refraction from +1 to -1 within the passband, illustrating the degree of spectral control possible with techniques as described in the ref. From the Jiang, Lin et al ref, of Penn State.

9/Dec/2013 added index of refraction of K0.95Na0.05Ta0.58Nb0.42O3 (KNTN) in the visible and NIR. These crystals are interesting in that they have very interesting electro-optic, electrostriction, and electroholography properties, which may make them good candidates for communications devices. Moreover, they are lead-free, which offers additional environmental and fabrication advantages. The material dispersion can be described by a single term single term Sellmeier equation, which makes for simple modeling. From the HIT/DMU Yao, Tian et al ref.

5/Dec/2013 Feedback from ??:I have used your site numerous times to calculate refractive index at different wavelengths of Fused Silica (amorphous) and it appears that the data that is being calculated has changed drastically.I have cross referenced with other sources and it appears to be wrong. Please let me know what the source of the issue is? At 633 nm and room temperature; fused silica should have a refractive index of 1.45705 but your program is giving 1.45834 ANSWER From Luxpop. The feedback is correct. The answer given by Luxpop was wrong as of the date of the feedback (Dec/3). This has now been fixed. Investigation into the root cause of this is ongoing . It appears the database entry for SiO2a was impacted during site updating on Nov/22. As such the returned answer for index of refraction on amorphous SiO2a was off by the noted 0.001 from Nov/22 to today. Luxpop will review its validation procedures in light of this incident and verify other related materials as well. Many thanks to the anonymous contributor who pointed this out.

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