Robust Population Transfer by Stimulated Raman Adiabatic Passage in aPr3+:Y2SiO5Crystal

Abstract

We report on the experimental implementation of stimulated Raman adiabatic passage (STIRAP) in a Pr3+:Y2SiO5 crystal. Our data provide clear and striking proof for nearly complete population inversion between hyperfine levels in the Pr3+ ions. The transfer efficiency was monitored by absorption spectroscopy. Time-resolved absorption measurements serve to monitor the adiabatic population dynamics during the STIRAP process. Efficient transfer is observed for negative pulse delays (STIRAP), as well as for positive delays. We identify the latter by an alternative adiabatic passage process.

Theory of the bright-state stimulated Raman adiabatic passage

“…This technique has been used in the experiment of Ref. [8] that we have taken to apply our theoretical results (see Sec. IV A).…”

“…The propagation of a counterintuitive pulse sequence in a Λ system in the STIRAP regime has been theoretically investigated in [5]. An efficient population transfer has been reported in crystals doped with rare-earth elements Pr 3+ :Y 2 SiO 5 [6,7,8]. We note that, due to their large density and scalability, solid media are of significant interest for applications, e.g.…”

“…We first apply the analysis to the experiment presented in [8], for which Ω p,max T s = 108.6, Ω s,max T s = 110.5, τ d /T s = 1.4, T p /T s = 0.8, and ∆T s = 50. Figure 2 displays the dynamics of population transfer to state 3 for various lengths qT s x of the medium and the corresponding projections of the state vector |φ on the eigenstates.…”

“…spectrally narrow transitions) and solids (density and scalability). Reference [8] also shows an alternative efficient method of population transfer where an intuitive sequence of pulses is used with a large one-photon detuning. Unlike the STI-RAP for which the dynamics adiabatically projects along a dark state (i.e.…”

Stimulated Raman adiabatic passage inTm3+:YAG

“…Therefore, as far as STIRAP is concerned, the two-photon detuning is precisely defined by the pump and Stokes frequency difference, ν p − ν s . Specifically, appropriate adjustment of this frequency difference can lead to two-photon resonance [24,25]. In Tm 3+ :YAG, the Raman inhomogeneous width grows with the magnitude of the applied magnetic field at the large rate of ∼400 kHz/T.…”