|SEMROCK, INC. Patent applications|
|Patent application number||Title||Published|
|20130308198||GLASS BLOCK DICHROIC BEAMSPLITTERS - A dichroic beamsplitter has a composite prism that has at least first and second prism elements that are coupled together along facing surfaces, wherein the respective facing surfaces of the first and second prism elements are equidistant from each other. The composite prism has a first flat external surface that lies within a first plane, a second flat external surface that lies within a second plane that is perpendicular to the first plane, a third flat external surface that lies within a third plane that is parallel to the second plane, and a coated surface internal to the composite prism and having a multilayer thin-film dichroic beamsplitter coating, wherein the coated surface lies within a fourth plane that intersects at least one of the first, second, and third planes at an angle that is less than about 25 degrees.||11-21-2013|
|20130215499||NOTCH FILTER SYSTEM USING SPECTRAL INVERSION - An optical filter apparatus transmits less than 5% of light within a notch spectral range about a central line wavelength with a notch bandwidth, and transmits more than 90% of light within a transmission spectral range that extends over an adjacent pass band of longer and shorter wavelengths and excludes the notch. The apparatus has a first thin film interference filter and a second thin film interference filter in the path of incident light reflected from the first filter. The first and second thin film interference filters are each treated to transmit light of the notch spectral range and reflect light of the transmission spectral range and each have thin film layers formed on a substrate, including first layers having a first refractive index, and second layers having a higher second refractive index. The notch bandwidth at full width half transmission is less than 5% of the central line wavelength.||08-22-2013|
|20120293868||MULTILAYER THIN FILM ATTENUATORS - An optical element has layers formed on a substrate, including alternating first and second layers having first and second refractive indices, n||11-22-2012|
|20110267678||Variable Spectral Filter Apparatus - A variable spectral filter apparatus has a filter support rotatable about a single axis of rotation and has at least first and second transmissive spectral filters, each spectral filter having a filter width defined by its first and second edges, wherein the filter width is orthogonal to the axis. The first edges of the filters are equidistant from the axis of rotation when the filter support is rotated to any angle. The plane of each of the spectral filters is parallel to the axis. Rotational positions of the filter support about the axis of rotation, over a first 60 degree range of angles, define, between the first and second edges of at least the first spectral filter, an undeviated filtered light path of at least half the filter width that extends orthogonally with respect to the axis. A rotational actuator is energizable to rotate the filter support about the axis.||11-03-2011|
|20110216399||Method For Manufacturing An Optical Transmission Filter With Extended Out-Of-Band Blocking - In accordance with the invention, a filter is fabricated 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.||09-08-2011|
Patent applications by SEMROCK, INC.