Naslov
Femtosecond pulse train excitation of a Doppler broadened rubidium vapor

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

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
38th EGAS, Ischia (Naples) 2006. / Antonio Sasso, Giuseppe Pesce, Giulia Rusciano - , 2006

Skup
38th EGAS, Ischia (Naples) 2006.

Mjesto i datum
Napulj, Italija; Ischia, Italija, 07.06.2006. - 10.06.2006

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
pulse train; rubidium

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA