Download or read book Thermal Effects in Optically Pumped Laser Rods written by Robert Lee Townsend and published by . This book was released on 1966 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermal Effects in Optically Pumped Laser Rods written by Robert Lee Townsend and published by . This book was released on 1966 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermal Effects in End heated Laser Rods written by Dana Christian Kopf and published by . This book was released on 1993 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unwanted heat generated in optically-pumped solid-state lasers causes thermal gradients, strain, and thermal expansion which in turn results in a nonuniform optical path difference (OPD) increase across the gain media. This ultimately results in poor beam quality. An interferometric based diagnostic for experimentally determining the time-dependent OPD change in an optically heated media was developed. This device is demonstrated by heating a glass (BK7) window with a CO sub 2 laser, effectively simulating high power end-pumping in a rod. Temporal OPD changes are measured by automated counting of interference fringes as they are generated by the thermal effects. A two-dimensional, time dependent model is developed to describe the radial temperature distribution in a cylinder, the stress and strain distributions, the thermal expansion, and the associated OPD change caused by a Gaussian heat source. This compared to the experimental data for the BK7 window to determine the validity of the approximations and its usefulness for other systems. Good agreement between the model and experiment, within 10 percent was observed.
Download or read book Thermally Induced Effects in Solid State Laser Rods written by Richard Lee Townsend (Jr.) and published by . This book was released on 1966 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experiment was performed to measure changes in optical length of ruby and neodymium in glass laser rods both during and after excitation by the pump flash. A Twyman-Green interferometer was used to produce fringes, the fringe movement being correlated with changes in optical length. Movement and distortion of fringes was observed using a multiframe image converter camera. The results show that all rods expand linearly with time during the time the pump is on and that all rods develop a distortion which is dependent on the radial energy density distribution within the rod. After the pump goes off, the rods being a relaxation back to the unexcited state. The relaxation is interrupted when hot air propagates from the flash tube to the rod causing the rod to reheat and causing an extremely concave appearance. The rods then relax slowly to an equilibrium state with ruby reaching this state in much shorter times (0.4 sec) than glass due to its higher thermal conductivity. These results stress the importance of uniform pumping if low beam divergence is to be achieved. Immersion of the rod in an index-matching infrared-absorbing fluid would be desirable not only to pump the laser uniformly but also to shield it from the infrared radiation which causes concave distortions after 20 msec. (Author).
Download or read book Modeling of Thermal Lensing in Side and End pumped Finite Solid state Laser Rods written by Vincent G. Brackett and published by . This book was released on 1990 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermally Induced Effects in Solid State Laser Rods written by Richard Lee Townsend (Jr.) and published by . This book was released on 1966 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experiment was performed to measure changes in optical length of ruby and neodymium in glass laser rods both during and after excitation by the pump flash. A Twyman-Green interferometer was used to produce fringes, the fringe movement being correlated with changes in optical length. Movement and distortion of fringes was observed using a multiframe image converter camera. The results show that all rods expand linearly with time during the time the pump is on and that all rods develop a distortion which is dependent on the radial energy density distribution within the rod. After the pump goes off, the rods being a relaxation back to the unexcited state. The relaxation is interrupted when hot air propagates from the flash tube to the rod causing the rod to reheat and causing an extremely concave appearance. The rods then relax slowly to an equilibrium state with ruby reaching this state in much shorter times (0.4 sec) than glass due to its higher thermal conductivity. These results stress the importance of uniform pumping if low beam divergence is to be achieved. Immersion of the rod in an index-matching infrared-absorbing fluid would be desirable not only to pump the laser uniformly but also to shield it from the infrared radiation which causes concave distortions after 20 msec. (Author)
Download or read book Optical Inhomogeneities in Pumped Lasers Volume i written by and published by . This book was released on 1967 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report delineates efforts expended on a project which required an analysis in depth of thermal distortion of wavefronts in large laser rods and discs. Two approaches for elimination of this distortion were considered: (1) establishment of a uniform temperature throughout the laser during pumping and (2) development of athermal glass parameters. Elements of both approaches were found necessary to solve the problem. In separate sections of the report detailed treatments are given to thermally stable cavities, temperature profile calculations, the effect of the laser field on index of refraction of the laser rod, and finally an analysis of end region stress. (Author).
Download or read book Interferometric Photographic Techniques for Recording Optical Path Length Variations in Pumped Laser Rods written by Charles J. Bickart and published by . This book was released on 1966 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report describes some unique photographic techniques developed during an investigation of thermal effects occurring in solid-state laser materials (Nd(+++) glass and ruby) during the pumping period. An experimental approach is described for the investigation of the interaction of a high-energy laser beam with the atmosphere. Two novel high-speed cameras designed specifically for these investigations are discussed in detail. Experimental results are shown from which conclusions concerning optimum pumping arrangements, rod characteristics, and doping concentrations can be drawn. (Author).
Download or read book Laser Damage written by Carl A. Pitha and published by . This book was released on 1967 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is a review of selected references dealing with descriptions and possible causes of damage to laser component elements functioning under high-power conditions, or to potential laser component materials exposed to high-power laser beams. Discussed are internal and surface damage, conditions prevailing in materials under lasing conditions, and the mechanisms proposed to account for the accumulation of sufficient energy for damage to take place; that is, self-focusing, stimulated Brillouin scattering, multiphoton absorption, and microplasma generation. Fifty-seven papers, published in 1964 - 1966, are included in the references.
Download or read book Lasers and Masers a Continuing Bibliography written by United States. National Aeronautics and Space Administration and published by . This book was released on 1965 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Solid State Laser Engineering written by Walter Koechner and published by Springer. This book was released on 2013-11-11 with total page 759 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book has once again been updated to keep pace with recent developments and to maintain Koechner's position as "the bible" of the field. Written from an industrial perspective, it provides a detailed discussion of, and data for, solid-state lasers, their characteristics, design and construction.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Physics and Technology of Laser Resonators written by Denis Hall and published by CRC Press. This book was released on 2020-08-26 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive yet concise, The Physics and Technology of Laser Resonators presents both the fundamentals and latest developments in laser resonator technology, including specific case studies. The book covers various types of resonators, including unstable, ring laser, and multifold laser. It also discusses numerical resonator calculations and laser beam analysis. This reference will be of value and interest both to newcomers to the field and to professional engineers wishing to update their knowledge.
Download or read book Government wide Index to Federal Research Development Reports written by and published by . This book was released on 1967 with total page 1352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Solid State Lasers written by Walter Koechner and published by Springer Science & Business Media. This book was released on 2006-05-29 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: Koechner's well-known ‘bible’ on solid-state laser engineering is now available in an accessible format at the graduate level. Numerous exercises with hints for solution, new text and updated material where needed make this text very accessible.
Download or read book Technical Abstract Bulletin written by and published by . This book was released on with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lasers and Masers written by and published by . This book was released on 1965 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
