Optical Components and Materials

Optical Components and Materials 141 Table 6.2. Optical densities D and transmissions T... 

J. Bourrieau, M. Romero Effect of space charged particle environment on optical components and materials , ESA Spacecraft Mater, in Space Environment, 275-285 (1979)... 

The success of femtosecond time-resolved experiments depends on having lasers able to provide sufficiently short and intense pulses, together with an effective integration of all the other instrumentation, optical components, and computers necessary for the enterprise, and on the susceptibility of starting material to photoexcitation. These requirements are readily understood. Success also depends on coherent formation of the excited system through the pump pulse, a consideration not so readily grasped. 

The combination of high transparency, high glass transition temperature, and refractive index, together with an excellent process-ability, makes COCs attractive as an alternative for materials like poly(carbonate) and PMMA in the field of optical components and high capacity DVDs and compact disks (57,58). 

It is safe to say that any conventional spectrophotometric and colorimetric analysis can be performed in an optical sensing format. That makes the optical sensors probably the most universal type of chemical sensors. Miniaturization of optical components and rapid advances in the development of new optical materials and hardware support this fast-growing area of chemical sensing. 

Synthetic, pure, quartz, SiO glass (also known as fused quartz) does not absorb UV radiation above approximately 150 nm. Because of its high transparency, melting temperature and resistance to corrosion, it is the material of choice for UV optical components and as an envelope material. 

The properties of alumina listed in Sects. 4-10 show the unusual performance of pure alumina, leading to the variety of applications given in Table 1. Practical aluminas with impurities and defects have somewhat degraded properties, but often are superior to many other materials, and have a variety of specialized applications such as refractories, electronic components, and catalyst substrates. In [1] there are articles discussing the future of alumina. There will continue to be incremental improvements in processing methods and properties, leading to expansion of present applications. What really new areas of application of alumina are likely These predictions are speculative, but the most promising new applications of alumina will probably be in electronic circuits, optical components, and biomaterials. Alumina fibers for composites and optics are attractive if they can be made pure, defect-free, and cheap. Because of its excellent properties other unsuspected applications of alumina will undoubtedly be developed. 

In the first group, the active principle is the light used to define patterns on a photosensitive material, and the resolution that can be achieved depends on the light wavelength. The final result, however, also strongly depends on the limitation of optical components and on material properties such as numerical aperture and the polarity of photoresist as well. 

Sn02 is frequently used as electrodes in glass melting furnaces, particularly those used for making glasses for optical components and lead crystal tableware. The requirements for the electrode material are very specific ... 

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