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The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A

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The Eclipse is a VISUAL event. Don’t be disappointed with cheap glasses that are safe but provide a washed out, hazy view of the Sun. Buy glasses that are manufactured using the highest quality film that provides crisp, clean, and pleasant view of the Sun in even slightly overcast conditions.

ISO 12312-2 (2015) Verification: All Eclipse glasses are tested to pass ALL requirements of the ISO 12312-2 standards. Our glasses are tested at an accredited USA based ISO facility. Many competitive products only pass the safe transmission requirements using very low quality film that do NOT provide a clear image of the Sun.

In this study different concentrations (10-2, 10-3, 10-4) mol./l were prepared for Rhodamine B dye in solvent water at room temperature, then the optical linear properties for example transmission and absorption spectrum were calculated by employ UV-visible Spectrophotometer to find the linear index of refraction, the linear coefficient of absorption, the coefficient of extinction, and. reflectivity, the results showed an increase in the coefficient of extinction and index of refraction. values with the increase in the concentrations. The properties of nonlinear optical of the samples for example non-linear index of refraction, and non-linear coefficient of absorbance were measured by using a new technical method called the Z-Scan technique, in two parts; The first one was a closed aperture placed ahead of the detector to calculate the index of nonlinear refractive. While the second part; the aperture ahead the detector was taken away (open manhole) to calculate the coefficient of nonlinear absorption. The two cases were performed using diode laser of a continuous wave (CW) with 650 nm wavelength and input power of 50 mW. The result shows that the samples exhibit negative refractive index (-n 2) self-defocusing for all concentrations and two-photon absorption for open aperture Ž-Scan so that the laser dye at this study can be applied in nonlinear optics application and it is useful in the optical limiter applications.

Labelling: ISO verification requires that the Contact Information of the manufacturer be printed on the product. A Logo or a Brand Name does not qualify. Products that do not have a manufacturers address are NOT compliant with current ISO 12312-2 requirements.