Download or read book Phase Conjugate Laser Optics written by Arnaud Brignon and published by John Wiley & Sons. This book was released on 2003-12 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: A complete review of the state of the art of phase conjugate lasers, including laser demonstrations, performances, technology and selection of the most important class of nonlinear media. * Emphasizes the basic aspects of phase conjugation. * Chapter authors have all made major contributions to their subjects.
Download or read book Phase Conjugation and Pulse Compression of High Energy Lasers written by and published by . This book was released on 1993 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: SBS phase conjugation is playing a crucial role in the scaling of solid state laser systems to high average power. Amplifier systems with near diffraction limited beam quality have been demonstrated with average power outputs of 100W in Nd:glass and Nd:YAG. Wavefront correction provided by an SBS phase conjugate mirror not only significantly lowers the output divergence of the laser, it also increases the maximum average power obtainable by preventing damage to optical components caused by distortion of the beam profile due to uncorrected thermally induced aberrations. The output pulsewidth format required for applications of high average power pulsed solid state lasers is extremely varied, ranging from below a nanosecond to many microseconds. However, most demonstrated applications of SBS phase conjugation to high average power laser systems have involved the amplification of typical Q-switched oscillator pulses of 7--30 ns in duration. Based on the requirements imposed by specific applications for high average power solid state laser systems, we have investigated and demonstrated the operation of SBS phase conjugated amplifier systems with output pulsewidths ranging from 1 ns to 1 [mu]s. The specific considerations for the various pulsewidth regimes as well as details of the experimental investigations will be presented.
Download or read book Phase Conjugation of High Energy Lasers written by and published by . This book was released on 2013 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this report we explore claims that phase conjugation of high energy lasers by stimulated Brillouin scattering (SBS) can compensate optical aberrations associated with severely distorted laser amplifier media and aberrations induced by the atmosphere. The SBS media tested was a gas cell pressurized up to 300 psi with SF6 or Xe or both. The laser was a 10 Hz, 3J, Q-switched Nd:YAG with 25 ns wide pulses. Atmospheric aberrations were created with space heaters, helium jets and phase plates designed with a Kolmogorov turbulence spectrum characterized by a Fried parameter, ro, ranging from 0.6 - 6.0 mm. Phase conjugate tests in the laboratory were conducted without amplification. For the strongest aberrations, D/ro ~ 20, created by combining the space heaters with the phase plate, the Strehl ratio was degraded by a factor of ~50. Phase conjugation in SF6 restored the peak focusable intensity to about 30% of the original laser. Phase conjugate tests at the outdoor laser range were conducted with laser amplifiers providing gain in combination with the SBS cell. A large 600,000 BTU kerosene space heater was used to create turbulence along the beam path. An atmospheric structure factor of Cn2 = 5x10-13 m2/3 caused the illumination beam to expand to a diameter 250mm and overfill the receiver. The phase conjugate amplified return could successfully be targeted back onto glints 5mm in diameter. Use of a lenslet arrays to lower the peak focusable intensity in the SBS cell failed to produce a useful phase conjugate beam; The Strehl ratio was degraded with multiple random lobes instead of a single focus. I will review literature results which show how multiple beams can be coherently combined by SBS when a confocal reflecting geometry is used to focus the laser in the SBS cell.
Download or read book Phase Conjugation of Laser Emission written by Nikolaĭ Gennadievich Basov and published by Nova Publishers. This book was released on 1988 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents results from fundamental research on the phenomenon of phase conjugation of laser emission discovered at the Physics Institute of the Academy of Sciences during stimulated scattering in hypersound, and with four-wave interaction in a wavelength range from the visible through the mid-infrared. Fundamentally new optical designs and methods of controlling laser emission are proposed and tested experimentally on the basis of this effect.
Download or read book Phase Conjugation Scaling for High Energy Lasers written by Robert W. Hellwarth and published by . This book was released on 1985 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phase conjugation of both continuous and pulsed 10.6 micron lasers by stimulated Brillouin backscattering (SBB) has been attempted. Because of various technical difficulties, conclusive evidence of SBB was not found. However, theoretical studies in this project supported further the promise of SBB for obtaining diffraction-limited beams from high power infrared lasers. Several novel schemes for realizing 10 micron waveguides of several meters length were explored experimentally. Keywords: High energy lasers; Phase conjugation; Stimulated Brillouin scattering; and Infrared waveguides.
Download or read book The Application of Phase Conjugation to High Power Lasers Using Stimulated Brillouin Scattering written by Robert Andrew Lamb and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Energy Laser Hel written by Bahman Zohuri and published by Trafford Publishing. This book was released on 2014-11-22 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: Directed Energy Weapons is nothing new to mankind, historically the origination of such weapons falls in centuries ago when first time the famous Greek mathematician, physicist, engineer, inventor, and astronomer Archimedes of Syracuse used different mirrors to collect sunbeams and focusing them on Romans fleet in order to destroy enemy ships with fire. This is known as the Archimedes Heat Ray. Archimedes may have used mirrors acting collectively as a parabolic reflector to burn ships attacking Syracuse. The device was used to focus sunlight onto approaching ships, causing them to catch fire. Of course the myth or reality of Archimedes Heat Ray still is a questionable story, but certain experiments with the help of a group of students from Massachusetts Institute of Technology was carried out with 127 one-foot (30 cm) square mirror tiles in October of 2005 that was focused on a mock-up wooden ship at a range of around 100 feet (30 m). The flames broke out on a patch of the ship, but only after the sky had been cloudless and the ship had remained stationary for around ten minutes. It was concluded the device was a feasible weapon under these conditions.
Download or read book High Energy average Power Lasers and Intense Beam Applications written by Michael C. Heaven and published by SPIE-International Society for Optical Engineering. This book was released on 2007 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of SPIE present the original research papers presented at SPIE conferences and other high-quality conferences in the broad-ranging fields of optics and photonics. These books provide prompt access to the latest innovations in research and technology in their respective fields. Proceedings of SPIE are among the most cited references in patent literature.
Download or read book Laser Handbook written by M.L. Stitch and published by Elsevier. This book was released on 2013-10-22 with total page 605 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 4 of the Laser Handbook continues the high standard set by the first three volumes which were widely acclaimed by numerous reviewers in Science, Optical Spectra and Laser Technology, as presenting an outstanding contribution to the field of laser technology.
Download or read book Diode Laser Phase Conjugation 03 FS 030 Final Report written by and published by . This book was released on 2005 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt: Arrays of lasers are often considered when a need exists to increase laser optical output power, for a variety of purposes. Similarly, individual semiconductor laser-diodes, generating 0.01-1.0 W each, are commonly placed in arrays in order to increase total optical power onto targeted objects. Examples of such usage are diode-laser pump arrays for solid-slab heat-capacity lasers, laser arrays for heat-treating materials, and arrays for efficient solid state laser systems. The commercial and defense communities also use such arrays for many applications from laser range-finders, laser designators, to laser machining systems, etc. However, the arraying process does not automatically increase ''focusable'' light on target (i.e., intensity/steradian). For those applications requiring the highest focusability, it is necessary that the collective output beam from arrays of individual lasers be phase-coherent. Under this condition, the individual laser-element optical outputs are ''fused together'' into a larger area, phase coherent (i.e., all wavefronts are ''in step''), high-power combined beam. The process of joining multiple laser beams together to produce a single coherent wave, is in general very difficult and seldom accomplished. Thus joining together many hundreds to thousands of beams from individual laser-diodes, in large arrays, is still an unsolved problem. There are 2 major reasons for this. Firstly, the phase of each output laser beam (i.e. the wave-fronts) from each laser diode often fluctuates within nanosecond time periods, making a control loop with sufficient bandwidth difficult to build. In fact, phase fluctuations (related to laser linewidth) limit the size of an extended system of arrayed diodes because of speed-of-light restrictions on information flow. Secondly, the output power per prior laser diode has been low (1W,) so that the size, expense, and complexity of control systems for correcting a multitude of output phases of the individual diode lasers in a large array, become prohibitive. Recently, we have been considering ways to use new diode geometries and 4-wave mixing/phase-conjugation technologies to enable large arrays of semiconductor lasers to be phased together to produce large-output-power laser systems, with good beam quality. If the ideas hold up, arrays of 100 to 1 million laser elements might produce 100 W to> 1 Megawatt laser beams. Such systems can have many defense and commercial applications.
Download or read book Advanced Phased Array Chemical High Energy APACHE Laser Program Volume 1 written by and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume I of the final report for the Advanced Phased Array Chemical High Energy (APACHE) laser program presents phase conjugate laser technology which verifies and demonstrates the key technologies associated with phase conjugation of high power continuous wave chemical lasers using stimulated Brillouin scattering (SBS). These demonstrations include: SBS under long pulse conditions simulating CW operation that demonstrates the feasibility of using SBS for a high power, CW laser; near diffraction limited performance for beam combination at the HF wavelength using SBS in high pressure xenon; flowing-gas SBS cell experiments demonstrating fluid mechanics capability for using a flowing SBS medium for CW SBS applications; SBS conjugation experiments using a 19-element segmented mirror showing the ability of SBS to correct piston and tilt misalignment errors in a multielement segmented optic; and experiments to determine how feedback to the master oscillator from the SBS cell affects system performance.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1995 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Photorefractive Optics written by Shizuhuo Yin and published by Academic Press. This book was released on 2000 with total page 593 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This text covers the fundamental aspects and the recent advances of photorefractive optics. There is a market potential for developing photorefractive (PR) optic devices for the needs of informational infrastructures. Photorefractive Optics provides an intensive background and details state-of-the-art technological applications for these needs. The book is a reference text for technical staff, research scientists, and graduate students who are working in the field."--BOOK JACKET
Download or read book High Average Power Pulsed Phase Conjugate Laser with Birefringence Correction Revision 1 written by and published by . This book was released on 1994 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nd:YAG rod lasers have been plagued with the inability to go to high average powers because of thermally induced birefringence and focusing. Several methods have been employed to correct for the birefringence and the thermal aberrations of such systems, but place stringent constraints on the laser heads and/or the system alignment. They have developed a scalable Nd: YAG master oscillator/power amplifier (MOPA) laser system which employs a novel phase conjugation scheme to correct both for the material and thermal distortions as well as the thermal birefringence in double pass amplifier systems. This method reduces the double pass depolarization from 42% to less than 2% and is easy to align.
Download or read book Advances in Lasers and Electro Optics written by Nelson Costa and published by BoD – Books on Demand. This book was released on 2010-04-01 with total page 860 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lasers and electro-optics is a field of research leading to constant breakthroughs. Indeed, tremendous advances have occurred in optical components and systems since the invention of laser in the late 50s, with applications in almost every imaginable field of science including control, astronomy, medicine, communications, measurements, etc. If we focus on lasers, for example, we find applications in quite different areas. We find lasers, for instance, in industry, emitting power level of several tens of kilowatts for welding and cutting; in medical applications, emitting power levels from few milliwatt to tens of Watt for various types of surgeries; and in optical fibre telecommunication systems, emitting power levels of the order of one milliwatt. This book is divided in four sections. The book presents several physical effects and properties of materials used in lasers and electro-optics in the first chapter and, in the three remaining chapters, applications of lasers and electro-optics in three different areas are presented
Download or read book Handbook of Laser Technology and Applications Principles written by Colin E. Webb and published by CRC Press. This book was released on 2004 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
