by National Aeronautics and Space Administration, Langley Research Center in Hampton, Va .
Written in English
|Other titles||Survey of beam combining technologies for laser space power transmission.|
|Statement||J.H. Kwon, M.D. Williams, and J.H. Lee.|
|Series||NASA technical memorandum -- 101529.|
|Contributions||Williams, M. D., Lee, J. H., Langley Research Center.|
|The Physical Object|
A Survey of Beam-Combining Technologies at for Laser Space Power Transmission t W Summary Laser beams of high optical quality and high average power (~ 1 MW) are t es._ntial for effective and practical power transmission in space. Such laser beams could be obtained by combining multiple laser arrays. i In this survey, a review of various beam. Compared with coherent beam combining, the technique of spectral beam combining has the great advantage of not requiring mutual temporal coherence of the combined eliminates some important technical challenges and makes it much easier to obtain stable operation at high power levels. On the other hand, the multi-wavelength nature of the output is then unavoidable, which may not. 5 Laser output power Report power upstream of near field aperture 6 Laser PIBM curve This is the primary beam quality characterization data 5’ Laser output power If the laser output is not stable, report as in Items 5 and 6, but in time slices 6’ Laser PIBM curvesFile Size: KB. The recent research progress of coherent beam combining of high power fiber lasers is reviewed. Key technologies like coherently combinable fiber laser, phase control of multiple beams and beam tilling are specially analyzed. Prospects for single coherently combinable high power fiber amplifier, beam tilling and target-in-the-loop control for propagation in real atmosphere are by:
Single laser elements will always have an upper limit of power. Progress in technology continuously demands higher power. This could be satisfied by developing a parallel but generic technology of Cited by: 2. We model the spectral beam combining of a fiber laser array in the external resonator configuration, as proposed by V. Daneu et al. A diffraction integral-based approach is used that leads to. An allowable transmission-line loss as high as dB has been experimentally obtained by using a newly developed high-power Â¿m Nd-y.a.g. laser with an average fibre input power of + Proceedings Paper it is of fundamental importance to improve the slow axis beam quality of the incorporated laser diodes regardless what beam combining technology is applied. To further advance our products in terms of increased brightness at a high power level, we must optimize the slow axis beam quality despite the far field blooming at.
The aperture efficiency ηap accounts for power lost between the laser or gyrotron output and free space, due to absorption, scattering, spillover (energy lost around the edges of optics), and blockage or diffraction by secondary reflectors and struts. For the laser system, ηap will be in the range of to , assuming all optics including the. Dr. John C. Bellum. Semi-Retired Consultant at Coherent Technologies. high laser damage threshold optical coatings, optical thin film coating process control, optical thin film coating production meter-class Z-Backlighter laser optics in keeping with their stringent requirements of resistance to high power laser damage. I have. Basic Free-Space Laser Communications System Free-Space Laser Communications Systems Performance Mitigating Turbulence Effects Summary: Improvement of Lasercom Performance Intended Audience: This class is intended for engineers, scientists, technicians, managers, and students who need to understand the basic principles of free-space laser. Coherent Laser Beam Combining Introduction to Nonlinear Oscillations Laser Isotope Separation in Atomic Vapor Optically Stimulated Luminescence - Fundamentalsand Applications Rarefied Gas Dynamics - Fundamentals for Researchand Practice Stochastic Numerical Methods - An Introductionfor Scientists Vibrations and Waves.