Marco P. Moreno

Coherence induced by a train of ultrashort pulses in a Λ-type system

We present an analysis of coherent population trapping in a three-level Λ system when excited by an ultrashort pulse train near the one- and two-photon resonances. Numerical results using Bloch equations give the transient response of the system and clearly reveal a comb of electromagnetically induced transparency (EIT) lines. An analytical solution to describe the EIT lines is derived in the steady-state regime and in the weak field limit. Moreover, numerical results indicate that selective velocity spectroscopy makes possible the observation of the comb of EIT lines in Doppler broadening media.

Sub-Doppler two-photon absorption induced by the combination of a single-mode laser and a frequency comb

The two-photon transition 5S-5P -5D in rubidium vapor is investigated by detecting the fluorescence from the 6P3/2 state when the atomic system is excited by the combined action of a cw diode laser and a frequency comb. The cw laser plays a role as a velocity-selective filter and allows for sub-Doppler spectroscopy over a large spectral range including the 5D3/2 and 5D5/2 states. For a counterpropagating beam configuration, the response of each atomic velocity group is well characterized within the Doppler profile and the excited hyperfine levels are clearly resolved. The contribution of the optical pumping to the direct two-photon process is also revealed. The results are well described in a frequency domain picture by considering the interaction of each velocity group with the cw laser and the modes of the frequency comb.The two-photon transition

Coherent blue emission generated by Rb two-photon excitation using diode and femtosecond lasers

5S-5P-5D

Observing the optical frequency comb in the blue fluorescence of rubidium vapor

in rubidium vapor is investigated by detecting the fluorescence from the

Two-photon transitions driven by a combination of diode and femtosecond lasers

6P_{3/2}

Resonances in a three-level lambda system excited by an ultrashort pulse train

state when the atomic system is excited by the combined action of a cw diode laser and a train of ultrashort pulses. The cw-laser plays a role as a velocity-selective filter and allows for a spectroscopy over a large spectral range including the

Comparative analysis in the frequency domain of the resonant interaction between an ultrashort pulse train and a two-level system

5D_{3/2}

Coherent Blue Light Driven by a Diode Laser and a High Repetition Rate Pulse Train

and

Velocity-selective two-photon absorption induced by a diode laser in combination with a train of ultrashort pulses

5D_{5/2}

Resonant interaction between an ultrashort pulse train and a two-level system: frequency domain analysis

states. For a counterpropagating beam configuration, the response of each atomic velocity group is well characterized within the Doppler profile, and the excited hyperfine levels are clearly resolved. The contribution of the optical pumping to the direct two-photon process is also revealed. The results are well described in a frequency domain picture by considering the interaction of each velocity group with the cw laser and the modes of the frequency comb.