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Femtosecond pulse train excitation of a Doppler broadened rubidium vapor (CROSBI ID 519700)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa

Ban, Ticijana ; Aumiler, Damir ; Skenderović, Hrvoje ; Pichler, Goran Femtosecond pulse train excitation of a Doppler broadened rubidium vapor // 38th EGAS, Ischia (Naples) 2006. / Antonio Sasso, Giuseppe Pesce, Giulia Rusciano (ur.). 2006

Podaci o odgovornosti

Ban, Ticijana ; Aumiler, Damir ; Skenderović, Hrvoje ; Pichler, Goran

engleski

Femtosecond pulse train excitation of a Doppler broadened rubidium vapor

In our recent papers we presented the observation of the velocity selective population transfer between the Rb ground state hyperfine levels induced by fs pulse train excitation. We developed a modified direct frequency comb spectroscopy (DFCS) which uses a fixed frequency comb for the 85, 87Rb 52S1/2 - 52P1/2, 3/2 excitation (Tsunami mode-locked Ti:sapphire laser with pulse duration of 100 fs and pulse repetition of 80 MHz) and a weak cw scanning probe (TOPTICA DL100, ECDL at 780 nm) for ground levels population monitoring. The Rb(52P1/2, 3/2) excited atomic levels have the relaxation times greater than the fs laser repetition period. In the time domain this leads to population and coherence accumulation effects. This corresponds to the interaction of the Rb atoms with the fs frequency comb in the frequency domain. As a result, velocity selective excited state hyperfine level populations are obtained, i.e. the mapping of the frequency comb to the atomic velocity comb. Simultaneously, velocity selective optical pumping of the ground hyperfine levels is achieved. We measured the 85, 87Rb (52P1/2, 3/2) hyperfine levels population by monitoring the 52S1/2 - 52P3/2 probe laser absorption. Modulations in the 52S1/2 - 52P3/2 hyperfine absorption line profiles are observed as a direct consequence of the velocity selective optical pumping induced by the frequency comb excitation. The 85, 87Rb 52S1/2 - 52P1/2, 3/2 fs pulse train excitation of a Doppler broadened rubidium vapor was investigated theoretically in the context of the density-matrix formalism. Simulated 52S1/2 - 52P3/2 absorption profiles were compared with the experiment and the agreement was excellent. The dependence of the observed modulations upon the wavelength and power of the fs laser and external magnetic field was investigated experimentally.

pulse train; rubidium

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Podaci o prilogu

2006.

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objavljeno

Podaci o matičnoj publikaciji

38th EGAS, Ischia (Naples) 2006.

Antonio Sasso, Giuseppe Pesce, Giulia Rusciano

Podaci o skupu

38th EGAS, Ischia (Naples) 2006.

poster

07.06.2006-10.06.2006

Napulj, Italija; Ischia, Italija

Povezanost rada

Fizika