Holography is a method of using interference to record both the phase and intensity of an object and therefore use it to reproduce an accurate 3dimensional representation of that object. The photographic recording of the image is called a hologram, which appears to be an unrecognizable pattern of stripes and whorls but whichwhen illuminated by coherent light, as by a laser beamorganizes the light into a threedimensional representation of the original object. A class iiia laser, it has an 4mw output comparable to common laser pointers, and is appropriate for making holograms up to 4x5 102x127mm in size. The use of multiplecavity lasers in holography and photography is described. Because holography is basically an interferometric process, the need for coherent radiation is clear. Coherence of radiation emitted by semiconductor lasers and. Pdf after invention of holography by dennis gabor in 1947 it is widely used in. Figure \\pageindex2\ shows one method of producing a hologram.
Apr 14, 2020 lasers and holography class notes, uiet, physics, engineering, semester computer science engineering cse notes edurev is made by best teachers of computer science engineering cse. The guided munition adjusts its flightpath to home in to the laser light reflected by the target, enabling a great precision in aiming. Another military use of lasers is as a laser target designator. Lasers for holography, slm, laser performance, laser wavelength. It guides students from simple optics to advanced topics in holography, following a practical approach using realworld materials. The color of a laser is related to the physics of the lasing medium. Now, the processed medium will replay both sets of fringes simultaneously and the final image will show up with dark fringes across it. You are now on what was once the hottest web page in the world for holography. Holography is a technique that enables a light field which is generally the result of a light source scattered off objects to be recorded and later reconstructed when the original light field is no longer present, due to the absence of the original objects. This document is highly rated by computer science engineering cse students and has been viewed 1938 times.
Another reason why inline holography is possible with a laserpointer is the power required. Basic holographic setup must have extremely stable, air bearing table. Lasers and holography by winston kock overdrive rakuten. By splitting up a ruby laser cavity and using part of the crystal for different cavities, a number of interesting possibilities result. From fundamentals to advanced experiments and applications, this book explains how holography works. Basic principles and applications of holography spie. Genesis cxseries, sapphire sf, verdi gseries, genesis lasers, verdi vseries, genesis cxslm, verdi lasers, innova sabre laser.
The development of new holography methods made it suitable for. This document is highly rated by students and has been viewed 4319 times. This is a lowpower laser pointer used to indicate a target for a precisionguided munition, typically launched from an aircraft. Laser pointer diode holography wonders of the bible. In this case, a portable holographic system travels to the artefacts for documentation. The development of holographic techniques is strongly connected with the development of lasers. Like in all interferometry applications, holography lasers must have incredibly long coherence lengths, for the phase to be maintained throughout the process.
Pdf the recent surge in interest in holographic techniques and holographic optical elements hoes related to virtual reality and augmented. Red lasers, usually heliumneon lasers, are common in holography beam splitter. These direct the beams of light to the correct locations. Kocks lucid introduction to lasers and holography has now been revised and updated for a second edition. This holography diode laser is among our most popular items used by teachers, students, and hobbyists. Holography is the process of producing holograms and, although they are recorded on photographic film, the process is quite different from normal photography. An introduction to coherent optics focuses on the processes, methodologies, and techniques involved in optics, including wave diffraction and patterns, zone plates, holograms, and diffraction. Lasers for holography the production of high quality holographic images has always relied on lasers with long coherence length and single mode properties in order to achieve stable interference for the entire exposure time. Birth of hologram preparation of hologram reconstruction of hologram uses of hologram future scope of holography 2 3. It also contains history and bios of some of the early researchers in the field. The holography forum has mirrored some of its files. Rotorwave had great notes on designing and building pulsed lasers. To get interference we need beam path to be approx.
Lasers for holography the performance characteristics of the lasers critical to being able to write crisp, high resolution white light holograms are wavelength, coherence length and wavelength stability. Lasers and holography dover books explaining science. Holography uses light interference or wave optics, whereas normal photography uses geometric optics. The typical transmission hologram is viewed with laser light, usually of the. Here is a great pdf student study guide that you can read and or download to help with your understanding of lasers, optics, and holography. It will explain the recording and reconstruction processes in holography. Lasers and holography prakash chandra mehta, dr v v. It represents a selfcontained treatment of the basic and stateoftheart topics on the two subjects in a single volume. Let us begin with a brief discussion of coherence in general, and the coherence properties of gas lasers in particular. Besides being an updated and expanded version of that book, it includes discussions of. The book covers the latest technological and scientific developments and major advances that have taken place in the last decade and includes. The object is distorted and a second recording is made on the same unprocessed medium.
Holography holography mathematics proposed by dennis gabor 1948 received nobel prize in 1972. It is an outgrowth of the authors science study series book lasers and holography. A hologram refers to the flat picture that displays a multidimensional image under proper illumination. The most common colors lines used for holography are 650nm red laser diodes, 633nm heliumneon lasers, 532nm frequency doubled yag dpss lasers, 514nm and 488nm argon lasers. Working along with my good holo friends steve michael, and the late sam savage, we shook the entire field of lasers and holography by creating holograms with laser pointers, and standalone higherpower diy laser diode systems. With the introduction of lasers to holography in 1963, real advances in the development of holography began to take place. Holography lasers lasers and laser diode from rpmc. The duration of such a pulse can be less than 110,000,000 of a second. This is done by adding to the information on the light amplitude brightness a second information, the phase of the light. Use of lasers in holography in another technique, a recording is made as usual, but the medium is not processed. The video lecture will explain how a hologram is made. Jeong lake forest college lake forest, illinois holography is a much broader field than most people have perceived. If the paths traveled by the two beams are dramatically different, coherence can be a problem. However, a laser shines light in a thin, intense beam.
Other types of holography, such as offaxis recording, separate the reference beam from the signal beam before the light passes through the test section. Lasers for holography cobolt high performance lasers. After invention of holography by dennis gabor in 1947 it is widely used in various areas. Pulsed lasers for holography are usually a mopa design in order to obtain enough power. Now, a halfcentury before gabor, the french scientist, gabriel lippmann, had proposed recording photo graphically a lightwave interference. This is a device that uses mirrors and prisms to split one beam of light into two beams. The book covers the latest technological and scientific developments and major advances that have taken place in the last decade and includes recent applications in. A moving object can be made to appear to be at rest when a hologram is produced with the extremely rapid and highintensity flash of a pulsed ruby laser. Digital holography using a laser pointer and consumer. Digital holography using a laser pointer and consumer digital.
Introduction extensive development of holographic methods has become possible only after the appearance of lasers capable of emitting highcoherence radiation of sufficient power. For optical recording of holograms or production of hoes for image displays the. The publication first ponders on holograms as wave patterns, coherence, and lasers. Holography is the process by which threedimensional visual information is recorded on a high contrast, very fine grain film. The production of high quality holographic images has always relied on lasers with long coherence length and single mode properties in order to achieve stable interference for the entire exposure time. Holography holography mathematics proposed by dennis. Holography allows to record and display threedimensional objects by generating a hologram. Physics mcq, class xii, cbse notes edurev is made by best teachers of. Applications of lasers holography linkedin slideshare. Holography, means of creating a unique photographic image without the use of a lens. Lasers and holograms free download as powerpoint presentation. Pdf important performance parameters when considering lasers. Holography grade lasers are made in almost every color of the rainbow from uv to ir. A more updated version may be available on laser sams faq.
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