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Zeeman Effect Observed in the Evanescent Wave

100%
Kawalec T., Kasprowicz M., Józefowski L., Dohnalik T.
Acta Physica Polonica A
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2004
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vol. 105
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issue 4
349-355
EN
We have observed a Zeeman effect in an evanescent wave absorption in Rb vapor with a single-mode tunable diode laser. The spectra are obtained for several magnetic field- and laser light-configurations enabling the observation of different pi and sigma Zeeman split lines contribution. The relative amplitudes and relative frequencies of all Zeeman components were calculated theoretically and compared with measured spectra. The analysis of the data can lead to the determination of the polarization state of the evanescent wave.
2
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Flexible Optical Dipole Mirror for Cold Atoms

100%
Kawalec T., Kiersnowski K., Fiutowski J., Dohnalik T.
Acta Physica Polonica A
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2008
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vol. 114
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issue 4
721-730
EN
A flexible and relatively simple and cheap optical dipole mirror for cold rubidium atoms from magneto-optical trap is described, being a very modern and efficient tool for atomic physicists. Emphasis is put on physical processes responsible for the mirror parameters and their optimization. Promising perspectives are provided for evanescent wave properties investigation and atom-surface interaction measurements.
3
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Magnetic Resonance Imaging at Low Magnetic Field Using Hyperpolarized ^3He Gas

76%
Suchanek M., Cieślar K., Pałasz T., Suchanek K., Dohnalik T., Olejniczak Z.
Acta Physica Polonica A
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2005
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vol. 107
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issue 3
491-506
EN
A low magnetic field magnetic resonance imaging system for small animal lung imaging using hyperpolarized ^3He gas is presented. The hyperpolarized ^3He gas at 1 mbar pressure and 30% polarization is obtained by the metastability exchange optical pumping technique. The magnetic resonance imaging unit is based on a permanent magnet of open geometry, built from a new generation Nd-B-Fe magnetic material. It produces the magnetic field of 88 mT with homogeneity better than 50 ppm in the 10 cm diameter sphere, after application of passive shimming. The magnetic field gradients of 30 mT/m are generated by a set of biplanar, actively shielded gradient coils. The first ^1H images of various biological objects, as well as ^3He images of the rat lung in vivo obtained in the described system are shown. In terms of sensitivity and resolution, the technique is superior to conventional ^1H magnetic resonance imaging, and offers great possibilities in early diagnosis of lung diseases.
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