Recent advances in the manufacturing of large (up to 62 mm diameter) glass blanks with axial index gradients of up to 0.20 enable significant performance gains in opticaldesigns. The new axial gradient material has a...
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ISBN:
(纸本)0819422517
Recent advances in the manufacturing of large (up to 62 mm diameter) glass blanks with axial index gradients of up to 0.20 enable significant performance gains in opticaldesigns. The new axial gradient material has an index and dispersion similar to SF (short flint) glasses, except the index varies continuously through the axis of the blank. The axial gradient material and numerous design examples using the new material will be presented.
The optical system of an optical rotary encoder is presented. The requirements of the optics system are given and their effects on opticaldesign decisions are discussed, Steps taken to insure stable operation over a ...
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ISBN:
(纸本)0819422517
The optical system of an optical rotary encoder is presented. The requirements of the optics system are given and their effects on opticaldesign decisions are discussed, Steps taken to insure stable operation over a -40 degrees C to +85 degrees C temperature range are presented. designing for manufacturing toleraces is discussed. A novel application of a fiber illuminator LED as a short-distance collimated source is shown to be an acceptable low-cost alternative to a laser diode. The importance of effective plastic element employment in low-cost, mass-production optical systems is demonstrated.
Photonic switching systems image arrays of sources onto arrays of detectors and modulators. Even this simple functionality poses serious challenges for the optical engineer. Image quality must be excellent because the...
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ISBN:
(纸本)0819422517
Photonic switching systems image arrays of sources onto arrays of detectors and modulators. Even this simple functionality poses serious challenges for the optical engineer. Image quality must be excellent because the large modulator bandwidth demands small modulator size. Magnification and distortion must be precisely corrected for the spot array to fit onto the detector array. The system must be extraordinarily stable for the spots to stay on the detector array. For these reasons, photonic switching systems have traditionally been mounted on vibration isolated optical tables. This paper will describe our newest system, which is mounted in a standard electronics frame. Experimental results and design methodologies will be discussed.
An optically routed gate array(OPGA) is used to implement a simple game of TIC TAC TOE to demonstrate the utility of electrooptical circuits which embody user input, display and logic functions in a single device. Pro...
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ISBN:
(纸本)0819422517
An optically routed gate array(OPGA) is used to implement a simple game of TIC TAC TOE to demonstrate the utility of electrooptical circuits which embody user input, display and logic functions in a single device. Progress on routing techniques layout and logic simulation will be presented.
The opticaldesign of a breadboard high resolution infrared spectrometer for the IRS instrument on the SIRTF mission is discussed. The spectrometer uses a crossed echelle grating configuration to cover the spectral re...
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ISBN:
(纸本)0819422517
The opticaldesign of a breadboard high resolution infrared spectrometer for the IRS instrument on the SIRTF mission is discussed. The spectrometer uses a crossed echelle grating configuration to cover the spectral region from 10 to 20 mu m with a resolving power of approximate to 600. The all reflective spectrometer forms a nearly diffraction limited image of the two dimensional spectrum on a 128 x 128 arsenic doped silicon area array with 75 mu m pixels. The design aspects discussed include, grating numerology, image quality, packaging and alignment philosophy.
The opticaldesign and the expected performances of a multi-band imaging system will be presented The instrument is to be operated in a low earth orbit in a pushbroom scanning mode. It has 15 spectral bands with the w...
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ISBN:
(纸本)0819422517
The opticaldesign and the expected performances of a multi-band imaging system will be presented The instrument is to be operated in a low earth orbit in a pushbroom scanning mode. It has 15 spectral bands with the wavelength range extending from 0.45 mu m to 10.7 mu m. The instrument comprises a single mechanically cooled focal plane, a 36 cm aperture, wide field of view off-axis three mirror anastigmatic telescope, and an on-board calibration subsystem. The design has near diffraction limited performance for ail spectral bands from visible to long wavelength infrared (LR). It has high throughput and low polarization sensitivity. To minimize the background noise at long wavelength infrared (LWIR) a cold stop is located at the exit pupil to achieve 100% cold shielding.
In many optical experimental systems, an achromatic 1/4 wavelength retarder is needed to satisfy experiment condition. This can be fulfilled using a rhomb prism which has a nearly constant refractive index in the work...
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ISBN:
(纸本)0819422517
In many optical experimental systems, an achromatic 1/4 wavelength retarder is needed to satisfy experiment condition. This can be fulfilled using a rhomb prism which has a nearly constant refractive index in the working wavelength range. To make the easy use of the prism in the optical system and to avoid the problem of central beam deviation, one type of the prism having three total internal reflection faces can be designed to have the total retarding angle equal to 90 degrees. Though the angle can be relativly easily calculated in principle, the size and optical opening window of the prism depend an the practical and optimum geometric design. In this paper, we will give a few examples of geometric design by taking different size parameters into consideration. We have made the prisms and put them into the application of measuring the magneto-optical Kerr ellipticity with success. Detailed calculation and error reduction in the design are also given.
A differential equation method is applied to the design of a three-mirror telescope. The resulting system is mostly free of spherical aberration, coma and astigmatism. From caustic theory and a generalization of the C...
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ISBN:
(纸本)0819422517
A differential equation method is applied to the design of a three-mirror telescope. The resulting system is mostly free of spherical aberration, coma and astigmatism. From caustic theory and a generalization of the Coddington Equations, the Abbe sine condition and the constant optical path length condition, three coupled differential equations, one for each reflecting surface, are generated. A system which satisfies these conditions will have a high resolution over a wide field of view. Analysis of this application is presented as a comparison to a similar three-mirror telescope system produced by conventional optimization techniques.
An afocal optical system designed to be attached to a conical optical beam deflector is discussed The conical beam deflector generates a collimated optical beam that rotates along a cone-shaped trajectory in space. Th...
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ISBN:
(纸本)0819422517
An afocal optical system designed to be attached to a conical optical beam deflector is discussed The conical beam deflector generates a collimated optical beam that rotates along a cone-shaped trajectory in space. This output beam is then fed to the afocal attachment, a telescope, designed to tailor the beam characteristics to suit a particular application. For many applications, the afocal attachment functions as a beam expander and modifies three characteristics of the input beam. First, it expands the input beam diameter to an acceptable level. Then, it inevitably reduces the apex cone angle of the beam due to the inherent property of a telescope. Third, the stationary plane, the plane where the apex of the cone resides, is magnified and transferred to the conjugate image plane.
In this paper, combining refractive and diffractive effects, a new kind of infrared lenses with wavelength 10.6 mu m was designed and produced for CO2 laser material processing. This refractive-diffractive lens (RDL) ...
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ISBN:
(纸本)0819422517
In this paper, combining refractive and diffractive effects, a new kind of infrared lenses with wavelength 10.6 mu m was designed and produced for CO2 laser material processing. This refractive-diffractive lens (RDL) converts a CO2 laser beam into the rectangular shape with light intensity distribution in the concave shape at x-direction. A method which employs input aperture division and geometrical transformation technique for obtaining a better initial phase distribution of the iteration is presented. The experimental results show that the desired shape of the output light beam was obtained with a high efficiency in energy utilization.
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