1. Nonlinear magneto-optical resonances for systems with J~100 observed in K2 molecules
M. Auzinsh, R. Ferber, I. Fescenko, L. Kalvans, M. Tamanis
Laser Centre, The University of Latvia
Iļja Feščenko Rīga,

2. Creation and destruction of atomic coherencez
Je =1 B s- s+ s- y s+
Jg =1 x
Introduction Experiment Theory Results Discussions Conclusion

3. Hanle effect and configuration
Je =1 s+ s-
Jg =1
M=-1
M=0
M=+1
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4. Magneto-optical effects
Applications:
opto-electronics,
medicine,
precise measurement techniques,
magnetometry...
Manifestations:
dark and bright resonances,
coherent population trapping,
electromagnetically induced transparency,
electromagnetically induced absorption,
slow light etc.
Introduction Experiment Theory Results Discussions Conclusion

5. Diatomic molecules History: Motivation:
First report in 1972 for the I2 molecule,
analysis using the classical treatment in terms of the balance equations for the classical probability density, in 1976.
First direct experimental studies in for the potassium and sodium,
A model was developed in 1988, applied an expansion of the density matrix via polarization (multipole) moments
Motivation:
to revisit the nonlinear ground state Hanle effect of a diatomic molecule with J~100,
to apply the detailed theoretical treatment,
to study in detail the peculiarities observed in earlier works.
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6. Cell
to vacuum system
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7. K2 molecules X1Sg+(2,99)→ B1Pu(0,99) X1Sg+(2,105)→ B1Pu(0,106)
Excitation
Registration
X1Sg+(2,99)→ B1Pu(0,99)
X1Sg+(2,105)→ B1Pu(0,106)
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8. Set-up Introduction Experiment Theory Results Discussions Conclusion
Polarizer
λ/2
Diode Laser
Power supply
Monochromator
PMT
Lens
Magnet
Coils
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9. Theoretical model
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10. Calculations
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11. Dependence on atomic density
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12. Dependence on laser power density
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13. Q and R excitation
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14. Dependence on laser power density
WR =27
WR =10
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15. Rabi frequency
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16. Multipole moments MJ DM = 2 MJ DM = 4 g= 2wL g= 4wL
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17. Summary Introduction Experiment Theory Results Discussions Conclusion
Nonlinear magneto-optical resonances have been studied for systems with large angular momentum (J~100) in K2 molecules.
Dark resonances have been theoretically predicted and experimentally detected.
Bright resonances were neither detected nor predicted by the theoretical model for such a system.
We explained the narrow maximum previously observed in the degree of LIF polarization in earlier works.
It was demonstrated that it is possible to describe nonlinear magneto-optical resonances in systems with large angular momenta over a wide range of experimental conditions with the theoretical model.
As a result, theoretical modeling can serve as a tool for future investigations of systems with large angular momenta and for the development of practical applications based on them.
Introduction Experiment Theory Results Discussions Conclusion