Double beam modulation system and holographic optical system design studies.

摘要

This dissertation involves a two part discussion. Part I is on "Double Beam Modulation System," and part II is on "Holographic Optical System Design.".;Optical communication has become increasingly important for information transmission because of its superior performance. As a new technology, optical communication is still developing rapidly. An optical beam has a potential information bandwidth of thousands of GHz. Currently the practical capability is only a few GHz due to difficulties in implementing the modulation, transmission, and receiving/demodulation. The method of double beam modulation (DBM) is a novel optical communication approach proposed several years ago. By using this technology, the information bandwidth can reach 1 THz (1,000 GHz).;The first part, Chapters 1 to 5, of this dissertation will discuss DBM. First, a theoretical description of the double beam modulation system emphasis will be on standing wave acoustic optical modulation, detection of tens GHz, and system consideration. The experimental results and analyses will follow.;Several achievements highlighted the work. The harmonic effect of standing wave acoustic optical modulator (SWAOM) has been analyzed and predicted. The experimental results agreed with the theories. The operation of a three division double beam modulation system using the acoustic optical modulators, the first of this kind, has been demonstrated. An extremely high frequency detection using an optical amplifier was proposed.;It is becoming more common to include hologram optical elements (HOE) in an optical system. This imposes some important problems for optical designers. The second part, Chapter 6 to 9, of this dissertation addresses this problem. A novel procedure is developed to use commercial software, Super Oslo, to design and evaluate a holographic optical system, and to generate the holograms. This procedure is illustrated using a holographic optical head.;The achievements include diffraction efficiency analysis of "thick" phase grating, finding an alternative method to locate the fringes, and improving the design of the holographic optical head.