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Q: Quantenoptik

Q 301: Poster: Fallen, Kühlung, Teilchenoptik

Q 301.13: Poster

Mittwoch, 6. März 2002, 11:00–13:00, Schloss

Transverse Laser Cooling of an Indium Atomic Beam — •Siarhei Sidarenka, Jiayu Wang, Dietmar Haubrich, and Dieter Meschede — Institut fuer Angewandte Physik, Universitaet Bonn, Germany

A new method for nanostructure fabrication using neutral atomic beams called atom lithography has been successfully demonstrated within the past several years. It applies a standing wave to focus atoms as they are being deposited onto a substrate. Several atomic species have been focused. Our work concentrates on the optical manipulation of indium atoms which can be helpful in manufacturing of photonic crystals or quantum dot lasers.

In one-dimensional focusing the deposited linewidth is primarily determined by the transverse collimation of the atomic beam. Therefore it is necessary to optically cool the transverse motion of the atomic beam before focusing.

Due to the indium fine structure two laser wavelengths (410nm and 451nm) must be utilized to close the cooling transition. 410nm is easily available from a simple GaN diode laser, and 451nm is available by frequency doubling of a Ti:Sa laser radiation with help of a KNbO3 or LBO crystal. We present numerical simulations of transverse Doppler cooling of an Indium atomic beam and the current status of the experiment. The results indicate that efficient laser cooling within this unusual two color laser cooling scheme should be experimentally possible.