Abstract:
Consistent with the present disclosure, a filter is provided by depositing a coating a substrate. The coating, which may include a plurality of hard-coating layers, has an associated transmission characteristic having a passband, as well as extended blocking.
Abstract:
Consistent with the present disclosure, a filter is provided by depositing a coating a substrate. The coating, which may include a plurality of hard-coating layers, has an associated transmission characteristic having a passband, as well as extended blocking.
Abstract:
Long-period gratings are written more quickly and at higher intensities by amplitude masks having shadow-forming patterns that scatter, redirect, or otherwise divert shadow portions of radiation used for writing the gratings instead of blocking the shadow portions by absorption or reflection. The shadow-forming masks can be formed along transparent base optics by arrays of diffusers, diffractors, or refractors that relatively divert different portions of the radiation.
Abstract:
The present disclosure relates to thin film optical interference filters. The filters include a substrate and a plurality of alternating material layers deposited on the substrate. When operated at about 45° angle of incidence, the filters exhibit at least one of improved polarization splitting, edge steepness, bandpass bandwidth, and blocking, relative to conventional thin film interference filters.
Abstract:
An optical filter is provided, including a first plurality and second plurality of alternating first and second material layers, where the first plurality of layers is at a first angle to incident light and has a cut-on edge, and the second plurality of layers is at a second angle to the incident light and a cut-off edge; where polarization splitting of the first plurality of layers at the cut-on edge and polarization splitting of the second plurality of layers at the cut-off edge do not exceed approximately 1 percent for any first and second angle between approximately 0 and 40 degrees; and the s-stopband wavelength of the second plurality of layers is approximately less than or equal to the cut-on edge wavelength, which is less than the cut-off edge wavelength, which is approximately less than or equal to the s-stopband wavelength of the first plurality of layers.
Abstract:
An optical element has layers formed on a substrate, including alternating first and second layers having first and second refractive indices, nL and nH that exhibit a spectral characteristic, providing, for incident light at a predetermined wavelength and directed toward the optical element within a range of angles bounded by first and second incident angles θ1 and θ2, between 0 and 80 degrees and differing by at least 1 degree, substantially linear polarization-averaged attenuation of the incident light energy wherein, for any incident angle θn between θ1 and θ2, Aθn is the corresponding polarization-averaged attenuation, and wherein the polarization-averaged attenuation at Aθn at angle θ1 is less than or equal to an optical density value of 0.2 and the polarization-averaged attenuation Aθn at angle θ2 exceeds an optical density value of 4.
Abstract:
An optical filter is provided, including a first plurality and second plurality of alternating first and second material layers, where the first plurality of layers is at a first angle to incident light and has a cut-on edge, and the second plurality of layers is at a second angle to the incident light and a cut-off edge; where polarization splitting of the first plurality of layers at the cut-on edge and polarization splitting of the second plurality of layers at the cut-off edge do not exceed approximately 1 percent for any first and second angle between approximately 0 and 40 degrees; and the s-stopband wavelength of the second plurality of layers is approximately less than or equal to the cut-on edge wavelength, which is less than the cut-off edge wavelength, which is approximately less than or equal to the s-stopband wavelength of the first plurality of layers.
Abstract:
An optical filter including at least one substrate and first and second thin-film interference filters disposed directly on the substrate. The interference filters include a plurality of hard coating thin film layers of alternating high and low index of refraction. A filter set capable of providing low image shift is also provided.
Abstract:
In accordance with the invention, a filter is fabricated by a modified form of the process disclosed in U.S. Pat. No. 7,068,430. In particular, the method is modified to take into account the effect of absorption by filter material. The method is exemplified by the fabricating of an ultraviolet light transmission filter for transmitting a band within the range 230-320 nanometers. The resulting filter comprises plurality of hard-coating, thin-film layers of alternating high and low index of refraction. The improved filter provides high transmission, sharp edge slopes, and deep and extended out-of-band blocking. As compared with currently available filters, the filter provides transmission up to three or more times greater, edge slopes up to four times sharper, and deep extended out-of-band blocking extending further, even through the visible range.
Abstract:
High performance optical edge and notch filters and methods of making the same are disclosed. The multi-layer, thin-film optical edge filters have an edge steepness greater than about 0.8% as measured by dividing (a) the edge width from the 50% transmission wavelength to the optical density 6 (“OD6”) wavelength by (b) the 50% transmission wavelength. The optical edge filters also have an average transmission above about 95%. The notch filters exhibit a blocking of OD>6, very high transmission (>90%) outside the notch(es), and a narrow notch bandwidth comparable to that of holographic notch filters. The methods for making such filters accurately determine when deposition of each layer of the filter should terminate.