A little displacement polychromatic parallel non-polarization beamsplitter, which is composed of two elements, has been introduced in this article. It has been studied by theoretical analysis and experiment, and has b...
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ISBN:
(纸本)0819409251
A little displacement polychromatic parallel non-polarization beamsplitter, which is composed of two elements, has been introduced in this article. It has been studied by theoretical analysis and experiment, and has been given the optimal structure. The displacement of the beamsplitter can be designed in need, which is about 1.0 - 3.0 mm. The polarization degree of the emergent light is below 1.2%, transmission is above 90%, transmission range is from 300 nm to 2500 nm. Its structure is simple, making convenient and loss low.
An accurate formula for calculating color wave aberration is provided, and the difference between the aberration computed by Conrady's wrong formula and the real aberration is pointed out. At the same time, a new ...
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The Hobby-Eberly Telescope uses a ii-meter diameter F/1.45 segmented spherical primary mirror. A spherical mirror of this size generates large amounts of spherical aberration. To be used successfully in a tilted optic...
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ISBN:
(纸本)0819432652
The Hobby-Eberly Telescope uses a ii-meter diameter F/1.45 segmented spherical primary mirror. A spherical mirror of this size generates large amounts of spherical aberration. To be used successfully in a tilted optical Arecibo type telescope, the spherical aberration needs to be corrected. This means that tracking of astronomical targets is achieved through moving a tracker optical package which imposes somewhat severe packaging constraints. Given these packaging constraints, novel methods must be employed to correct the aberrations with the Spherical Aberration Corrector contained in the moving hacker optical package. The paper reviews the pertinent requirements, constraints and the resultant design of the Hobby-Eberly Telescope Four Mirror Spherical Aberration Corrector.
The current trend for higher resolution and sensitivity for Astronomy and Earth Observation space missions is leading to larger entrance apertures for future optical payloads, often requiring challenging and ultra-sta...
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ISBN:
(数字)9781510629264
ISBN:
(纸本)9781510629257;9781510629264
The current trend for higher resolution and sensitivity for Astronomy and Earth Observation space missions is leading to larger entrance apertures for future optical payloads, often requiring challenging and ultra-stable optical performances driving the instrument design and implementation. The level of complexity for such large systems requires a multidisciplinary approach and technological developments in cross-sectorial areas such as optics, structures, pointing accuracy, control, mechanisms. We present here a range of ESA R&D developments related to future large ultra-stable optical instrument architectures, providing perspectives on the identification of enabling technologies in view of current and future optical missions as well as and a wayforward to maturity for implementation within potential future missions.
The focusing grating coupler (FGC) can be constructed using holographic techniques. Due to the wavelength scaling between the construction of the FGC and its final enduse operation, aberrations exist in the final spot...
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A uv-curing 'cold' blocking adhesive has been developed by Loctite Corporation for use with the Opticam SM. The adhesive is a significant advance in the lens blocking process, as it eliminates heat-induced blo...
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ISBN:
(纸本)0819409251
A uv-curing 'cold' blocking adhesive has been developed by Loctite Corporation for use with the Opticam SM. The adhesive is a significant advance in the lens blocking process, as it eliminates heat-induced blocking strain; the most significant problem encountered with current hot pitch blocking methods. The new cold blocking adhesive is complemented by a new Kennametal lens blocking adapter tool and chucking system. The tooling offers substantially improved lens adapter to machine alignment and transfer; at considerably lower cost. The lenses are deblocked in a heated water and detergent solution, eliminating the environmental concerns of the current method.
Over the years much time has been dedicated to improving lens optimisation routines. Most of the work has been upon the damped least squares (DLS) method. In this paper a number of theoretical and practical enhancemen...
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ISBN:
(纸本)0819441554
Over the years much time has been dedicated to improving lens optimisation routines. Most of the work has been upon the damped least squares (DLS) method. In this paper a number of theoretical and practical enhancements are presented. Some are new, others have already been published but never transposed into commercial software. These enhancements combine to allow the user to make more informed choices at every stage of an optimisation, and have now been incorporated into the widely used WinLens software package.
Low polarization beamsplitter has been reported by article and patent in Applied Optics in 1983. Which structure is a quartz birefringent plate, it can be used to splite beam by using the reflection and refraction of ...
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ISBN:
(纸本)0819409251
Low polarization beamsplitter has been reported by article and patent in Applied Optics in 1983. Which structure is a quartz birefringent plate, it can be used to splite beam by using the reflection and refraction of the surface of the birefringent plate. In this article I have introduced a polychromatic adjustable beamsplitting angle low polarization prism, which is composed of four elements. I have studied it by theoretical analysis and experiment measurement. Whose character is: (1) the beamsplitting angle can be adjustable continuously, (2) transmission is high, (3) the intensities of the two beams are about equal, and, (4) the adjusting is convenient and reliable. Such as a 37 degree(s) prism, the beam splitting angle is from 15 degree(s) to 45 degree(s), transmission is above 85%, the maximum polarization degree of the emergent light is below 10%. The range of the beamsplitting angle can be designed in need.
In recent years, the need for wide-angle, unobscured, all-reflecting opticaldesigns has increased significantly. This paper takes a look at several of these types of designs, and compares their performance and limita...
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At present, whether the economic benefit of a designed optical system is high is an important mark to judge the opticaldesign level. The "Information - Price Ratio", the ratio of the spatial information qua...
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