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Author: P. F. Browne
Publisher:
ISBN:
Category :
Languages : en
Pages : 32
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Book Description
This report describes the design, and progress toward the construction, of systems required for the study of the propagation of 10.6 micrometers radiation from CO2 lasers (both high power pulsed and cw) through clouds, both laboratory generated and natural. The laboratory experiments of highest priority are the study of non-linear attenuation of high power TEA laser pulses (of order 10 J/sq. cm.) through optically thick clouds produced by adiabatic expansion with particular attention to change of pulse shape, and measurements of backscatter. The systems required for these experiments are nearing completion. The field experiments are the study of attenuation, beam quality and backscatter of TEA laser pulses and cw radiation over a return path of the order of 1 km. The systems required are under construction. All lasers and also the transmissometer have been developed within the group. (Author).
Author: P. F. Browne
Publisher:
ISBN:
Category :
Languages : en
Pages : 32
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Book Description
This report describes the design, and progress toward the construction, of systems required for the study of the propagation of 10.6 micrometers radiation from CO2 lasers (both high power pulsed and cw) through clouds, both laboratory generated and natural. The laboratory experiments of highest priority are the study of non-linear attenuation of high power TEA laser pulses (of order 10 J/sq. cm.) through optically thick clouds produced by adiabatic expansion with particular attention to change of pulse shape, and measurements of backscatter. The systems required for these experiments are nearing completion. The field experiments are the study of attenuation, beam quality and backscatter of TEA laser pulses and cw radiation over a return path of the order of 1 km. The systems required are under construction. All lasers and also the transmissometer have been developed within the group. (Author).
Author: O. A. Volkovit︠s︡kiĭ
Publisher: AIAA
ISBN: 9781600863929
Category : Clouds
Languages : en
Pages : 372
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Book Description
Annotation This text deals with the interaction between intensive laser radiation and clouds and will be helpful in implementing specific laser systems operating in the real atmosphere. The fundamentals of nonlinear statistical optics of aerodisperse media are addressed for the first time in this volume. Scientists and engineers interested in the problems of laser radiation propagation in the atmosphere, as well as postgraduates and senior students specializing in nonlinear optics, laser physics, and quantum electronics, will find the expert research contained within these pages valuable.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1048
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Author:
Publisher:
ISBN: 9781600866111
Category :
Languages : en
Pages :
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Author: V.E. Zuev
Publisher: Springer Science & Business Media
ISBN: 9400952198
Category : Science
Languages : en
Pages : 303
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Book Description
Unique properties of laser radiation including its monochromatic properties, polarization, high spectral intensity, coherence, narrow beam divergence, the possibility of controlling the pulse duration and radiation spectrum and, finally, the fact that extremely high power and energy create very favorable conditions for the extensive application of lasers to communi cation systems, systems for the lidar sensing and ultra-high-precision ranging, navigation, remote monitoring of the environment, and many other systems operating in the atmosphere. The operative efficiency of the above systems depends significantly on the state of the atmosphere and the corresponding behavior of laser radia tion propagating through it. This circumstance has stimulated the studies of the above regularities during the passt 10-15 years. For the investiga tions to be carried out the scientists were forced to develop new theories and methods for studying the problem experimentally. Moreover, during such investigations some previously unknown phenomena were observed, among them the nonlinear effects accompanying high-power laser radiation propagating through the atmosphere are of paramount importance. Among the nonlinear effects caused by high-power laser radiation inter action with the atmosphere, the effects accompanying the propagation of high-power radiation through the atmospheric aerosols are of particular interest. Aerosols always occur in the atmosphere. It should be noted that the microphysical and optical characteristics of atmospheric aerosols vary widely, this fact causes a great variety in the features of their inter action with radiation.
Author: P. F. Browne
Publisher:
ISBN:
Category :
Languages : en
Pages : 33
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The report contains a detailed theoretical discussion of the effect of CO2 laser (10.6 micrometer wavelength) energy on fog droplets, and the subsequent effects on the optical propagation path of the laser beam. Changes in refraction index in the beam cross section are considered. Plans for construction of a fog generation chamber for water fogs of controlled characteristics suitable for CO2 laser experimentation are given. Work on the development of CO2 TEA2 laser and triggering systems and progress on a 50 W CW diffusion cooled CO2 laser is discussed. Planned experiments, using the laser under development, for study of the interaction of such beams with laboratory controlled fogs are described. (Author).
Author: R. A. McClatchey
Publisher:
ISBN:
Category : Atmospheric radiation
Languages : en
Pages : 84
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Book Description
High resolution transmittance curves are presented for the spectral region 320-1400 wave numbers. These spectra are useful as a guide for selecting laser wavelengths for atmospheric propagation studies in this spectral region. In addition, this report provides specific information concerning the attenuation coefficients of 41 CO2 rotational laser lines in the 10.4 micrometer band system (v3 to v1). Charts for predicting the atmospheric attenuation of the CO2 laser lines are provided for each of five climatological model atmospheres and two haze models. The current report extends the work presented in two earlier reports on (1) CO laser attenuation in the 1400-2120/cm−1 (4.72-7. 14 micrometers) region: AFCRL-71-0370 and (2) HF and DF laser attenuation in the 2120-3740/cm (2.67-4.72 micrometers) region: AFCRL-72-0312. This report, when combined with the two previous reports described above, provides synthetic spectra for the entire region from 2.67-31.25 micrometers.
Author: P. F. Browne
Publisher:
ISBN:
Category :
Languages : en
Pages : 99
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Book Description
This report describes (1) theory, design and performance of a CO2 TEA laser with VUV preionization delivering typically 25J pulses of duration 0.1 microsecond and beam cross section 20 per sq cm; (2) the production of clouds in the laboratory by adiabatic expansion of compressed gas in a 300 1 glass chamber and the measurement of the cloud parameters (liquid water content, drop radius); (3) measurements of attenuation by such clouds of TEA laser pulses of the above type and also measurement of partial cloud clearing by a CW 10.6 micrometer beam (by recording the change in attenuation of a collinear He-Ne beam); and (4) the theory required to understand the interaction between 10.6 micrometers radiation and clouds of droplets. (Author).
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 906
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Book Description
