Interferometrie mit laserpraeparierten Kalziumatomen zur Realisierung eines Frequenznormals

Abstract

By investigations of Ramsey resonances at laser cooled Ca atoms it is demonstrated that with cool atom beams frequency standards are available with instabilities about 10 "-"1"4 ( "s"/ t_M) "1"/"2 and uncertainties #partial deriv##nu#/#nu# #approx# 10 "-"1"4 . The uncertainty can be reduced to < 10 "-"1"5 using pulsed excitements and laser trapped atoms. The frequency standard can be further improved by back-pumping of the "1D_2 state population via 5"1P_1 state into the cooling cycle and using the intercombination line for the cooling process. (WEN)SIGLEAvailable from TIB Hannover: RA 3254(40) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman