Presentazione di PowerPoint

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Chaotic Imaging
PhD Student Emiliano Puddu
Tutor Prof. A. Andreoni
XX Ciclo di Dottorato A.A. 2004/05
Email Emiliano.Puddu_at_uninsubria.it
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Index
Three wave interaction
Imaging Configurations
Chaotic imaging
Image enhancement recovery
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Maxwells equations for the three wave interaction
z
E3
E2
E1
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Sum and Difference frequency
Lower frequency fields are injected Sum
frequency interaction
Higher frequency field is injected Difference
frequency interaction
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Phases of the involved fields
a)
b)
c)
a)
b)
c)
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IMAGING CONFIGURATION I
Sum Frequency
telescope
dO
1064 nm
BBO
k2
O
O'
CCD
k3
355 nm
k1
L
O''
dO'
532 nm
case a)
Real Object O, Virtual Image, O, transformed
into real O
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IMAGING CONFIGURATION II
Difference Frequency
telescope
CCD
O''
dO
1064 nm
L
BBO
k2
k3
355 nm
O
x
k1
O'
l
dO'
532 nm
case b)
Real Object O, Virtual Image, O, transformed
into Real O
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IMAGING CONFIGURATION III
Difference Frequency - Real Object
dO
CCD
O'
1064 nm
BBO
O
k2
k3
355 nm
k1
dO'
532 nm
case c)
Real Object O, Real Image O
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IMAGING CONFIGURATION IV
Difference Frequency
dO
1064 nm
CCD
O''
L
BBO
k2
k3
O'
355 nm
O
k1
2f
2f
532 nm
dO
case b)
Real Object O, transformed into Virtual O, Real
Image O
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What if.
one of the injected beam has thermal statistic?
We realise the situation of
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chaotic imaging!
case b) at degeneracy
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Experimental result
The three holes are not recognizable!
Case b) at degeneracy
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Fourier optic interpretation
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Correlation protocol
Bondani, Puddu, Andreoni, J.M.O., in press
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Geometria dinterazione
2 Ground Glass Plates
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Correlation protocol II
250 samples
6000 samples
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Phase Matching conditions in the chaotic imaging
Andreoni, Puddu, Bondani, Manuscript in
preparation
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Image Enhancement
Shift and Average add only the maps that
respect the condition
j
i
Averages over a sample of 7 correlations
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Image Recovery
The same procedure is applied to an insufficient
sample of images!
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Results
Reduction of the number of the samples 250 Vs
6000

6000 samples
Reduction of the noise
250 samples
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Perspectives
Can chaotic imaging generate ghost imaging?
Can chaotic imaging be applied to cryptography?
I.E.N. ISTITUTO ELETTRONICO NAZIONALE GALILEO
FERRARIS
Dott. S. Castelletto Dott. I. Degiovanni