Download e-book for kindle: Applied Cryptography: Protocols, Algorithms and Source Code by Bruce Schneier

By Bruce Schneier

ISBN-10: 1119096723

ISBN-13: 9781119096726

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Meyrueis, ‘Digital Diffractive Optics’, John Wiley & Sons, Ltd, Chichester, 1999. [8] B. Kress, ‘Diffractive Optics Technology for Product Development In Transportation, Display, Security, Telecom, Laser Machining and Biomedical Markets’, Short course, SPIE SC787, 2008. [9] S. Sinzinger and J. Jahns, ‘MicroOptics’, VCH, Weinheim, 1999. 3 Guided-wave Digital Optics As pointed out in the previous chapter, guided-wave optics is an important field of digital optics. Guidedwave digital optics refers more to integrated waveguides rather than fiber optics (systems that are fabricated through digital lithographic means rather than the conventional fiber perform drawing process).

From that time onwards, Fourier optics has become an important part of modern optics technology, mainly due to the early works of Professor Joseph Goodman at Stanford [4]. Many different techniques can be used to design a diffractive element that produces the same optical functionality. 5 summarizes these various types of free-space digital optics. . Type 1 – Holographic Optical Elements (HOEs) – refers to the traditional optical holographic recording of volume-phase holograms (in phase modulation materials) or surface-relief holograms (in photoresist materials).

When it comes to coupling a laser diode into a fiber, the mode size is very different, and coupling techniques include the ball lens (B1), diffractive lenses (B2) or the lensed fiber (B3 – chiseled tapered fiber end tip). Laser diode to fiber coupling is usually a difficult task owing to the size of the laser diode core (about 3 mm). Moreover, the laser diode waveguide core is not round or square, but rectangular, which produces strong astigmatism. Therefore, laser diode collimators are usually orthogonal cylindrical lenses instead of circular symmetric lenses.

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Applied Cryptography: Protocols, Algorithms and Source Code in C. 20th Anniversary Edition by Bruce Schneier

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