JPRS ID: 9805 USSR REPORT PHYSICS AND MATHEMATICS

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• Original Classification: U
• Document Page Count: 58
• Document Creation Date: November 1, 2016
• Sequence Number: 44
• Content Type: REPORTS

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JPRS L/9805
~ 24 June 1981 ~
USSR Re o~rt
p
- PHYSICS AND MATHEMATICS
C~OUO 6/81)
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JPRS L/9805
24 June 1981
t1SSR REPORT
PHYSICS AND MATHEMATICS
- (FOUO 6/81)
- CONTENTS
ACOUSTICS
Diffraction of Acoustic Pulses by Elastic Bodies 1
CRYSTAI.S AND SEMICONDUCTORS
High Pressure Physics: Collection of Scientific Papers 5
I..t~SERS AND MASERS
Open Optical Resonators 8
Efficiency of Four-Wave Interaction in a Medium With Cubic Nonlinearity. 12
Development of Sma.ll-Scale Inhomogeneities in Photodissociation
Lasers 17
Copper Halide Laser With Pumping by Vacu~ Tube and Thyratron
Uscillators 22
Tlieoretical Investigation of a Ring Model of a Supersonic Chemical
DF-C02 Laser 26
l.a~ing Observed on the B-X Transition of the XeF Excimer With KrF2
Photodissociation in Mixtures With Xe 32
01''1'TCS AND SPECTROSCOPY
On the Question of Processing N-Speckle Images of Astronomical
Oi~jects 35
Investiga~~ion of Hologram Elements for Correcting the Wave Fronts of
Pulse Lasers 39
- a- (III - USSR - 21.H S&T FOUO]
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Methucts o� ~aluating the Capabilities of Optimum Reception in
_ Detecl-ing Aetrophysical Ob~ects Through a Turbulent Atmo~phere....... 45
MATHF~tt1TICS
Queueing Systems 52
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ACOUSTICS
UDC 53k.2
DIFFRACTION OF,ACOUSTIC PULSES BY ELASTIC BODIES
Moscow DIFRAKTSIYA AKUSTICHESKIKH IMPUL'SOV NA UPRUGIKH TELAKIi in Russian 1979
( signed to press 10 Jul 79 ) pp 2-~+, 238-239
[Annotation, preface and table of contents from book "Diffraction of Acoustic
Pulses by Elastic Bodies", by Yaan Aleksandrovi~ch~~Metsaveer,..Naum Davidovich
Veksler and Anatoliy Svyatoslavovich Stulov, Institute of Cybernetics, ESBR
Aca~ieu~y of ~ciences , I zdatel'stvo "Nal,ika" , 1~+00 copies , 240 pages ]
~[T~xt] This book presents methods of calculating acoustic echo signals from
deformable bodies, and discusses the use of,these signals for determining the
geometric and physical parameters of the scattering bodies. An investigation is
ma,de of acoustic echo signals from thin shells and solids of spherical, cylin-
drical and arbitrary shape. Strain waves in thin elastic shells are studied in
the f'ramework of equations of motion that correspond to a linear shell theory of
Timoshenko type, and strain waves in solid bodies are studied in the asswnption
of e� ~6)
_ To find , here, in contrast to Labeyrie's method [1], it is proposed
that rather than attempting to record the N-speck~e images of a pbint source
that may nc~t even be there,~the images should be synthesized,~rom the N-speckle
imageG of an extended. ob~ect. The synthesis concept is based on the fact that
the instantaneous countours of speckle images of extended and point objects
coincide and are deternnined by the atmospheric "seeing" spot. The difference
consists only in the fact that within an atmospheric seeing spot, the size of
indi.vidual spots in the image of a point source is determined by the Airy disc
of the telescope, while in an image of an extended object, this size is governed
l~y t}ie convolution of the true distribution of object inentsity with the Airy
disc of the telescope [5]. Based on this, to synthesize N independent image
spots oF a point source, we single out N countours of speckle images of the
extended object (1) and fill them in a random fashion with the Airy discs of the
telescope. Then~ by performing operations on them ana,l.ogous to (3) and (6),
we obtain