by Stijn Gheysen

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Electromagnetically Induced Transparency
for gamma photons
by Stijn Gheysen
Group of Gamma Optics
(Prof. J. Odeurs, Prof. Em. R. Coussement, R.
Callens, I. Serdons)
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Outline
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1.The Mossbauer effect

• Resonant emission and absorption?

• Application to hyperfine interaction study

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2. An intriguing Mossbauer spectrum
(M. Van Den Bergh, PhD thesis, IKS, 1994)
57Fe in FeCO3-powder
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Outline
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3.Experimental proof

• Experimental setup

(Prof. H. Muramatsu, Shinshu University, Nagano)
liquid He cryostat
detector
superconducting magnet
cold finger
Mossbauer drive Rh(57Co)
57Fe in FeCO3 (T20)
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• Results

Perpendicular geometry
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Parallel geometry
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4. What physics lie underneath?

• Classical saturation effect

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• perpendicular geometry

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Model coupled Maxwell-Bloch equations
(taking into account thickness and polarization
effects)
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• parallel geometry

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Model coupled Maxwell-Bloch equations
(taking into account thickness and polarization
effects)
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4. What physics lie underneath?

• Classical saturation effect
• Quantum mechanical interference

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• Is this our scheme?

• But, if small non-axial symmetric interaction
  present

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Analogy with Electromagnetically Induced
Transparency
Scheme for EIT in
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Outline
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Conclusions

• Observation of reduced absorption at level
  crossing

• In perpendicular geometry saturation effect

• Origin of mixing small non-axial part of efg

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Outlook

• Control over mixing interaction? (applying
  external magnetic field)

• Can we slow down single gamma photons?

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The end
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Nucleus-gamma vs. atom-laser
?c
?b
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Relaxation effects in fluctuating fields
(Hang Nam Ok, Phys. Rev. 185 2, 472
(1969)) (M.Blume and J.A.Tjon, Phys. Rev. 165 2,
446 (1968))
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Explanation?
Interference effects?
When can 1 photon make the two transitions
simultaneously?
AND if angular momentum is conserved
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Z
photon
nucleus