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Quantum Optics Journal of the European Optical Society Part B

Observation of inversionless amplification in Sm vapour and related experiments

Wulfhard K. Lange, A. Nottelmann, C. Peters

Published Aug 1, 1994• 7 citations
Publisher

Abstract

An experiment is presented which demonstrates 'amplification without inversion' (AWI) and 'inversion without amplification' of a picosecond pulse in a generalized lambda-type system. The phenomena are based on Zeeman coherence in the J=1-level of the ground state multiplet in samarium, induced by a picosecond pulse train. The experiment and its relation to other AWI proposals and to previous experiments in atomic spectroscopy are discussed in detail.

DOI
10.1088/0954-8998/6/4/006

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Interpretation of transient V scheme amplification without inversion

J. Mompart, C. Peters, R. Corbalán

Amplification without inversion (AWI) in a resonant V-type system is studied using a dressed basis which reduces the coherent interaction of both involved optical transitions to that of a single two-level system. The transient AWI recently reported through a numerical analysis of the density matrix equations of the V-system in the bare atom basis (Zhu Y 1996 Phys. Rev . A 53 2742) is damped Rabi nutation with transient population inversion in this dressed basis. Although the transient AWI in the bare state basis occurs both with and without an incoherent pump field, the integrated probe gain is positive only in the first case.

Quantum and Semiclassical Optics Journal of the European Optical Society Part B•Apr 1, 1998•10 citations
An experiment is presented which demonstrates 'amplification without inversion' (AWI) and 'inversion without amplification' of a picosecond pulse in a generalized lambda-type system. The phenomena are based on Zeeman coherence in the J=1-level of the ground state multiplet in samarium, induced by a picosecond pulse train. The experiment and its relation to other AWI proposals and to previous experiments in atomic spectroscopy are discussed in detail.
Recent progress has been made in the theoretical and experimental study of the amplification of optical signals without population inversion (AWI) of the participating electronic levels. Induced coherence among appropriate levels in the active medium is the necessary condition for obtaining AWI. Similarly, the generation of wave packet states in atoms and molecules also relies on the coherent superposition of several states. It is feasible, therefore, that AWI is possible in a system which has been excited into a wave packet state. We have thus demonstrated experimentally such amplification in an extended sample of sodium dimers and we term this process wave packet amplification (WPA). An important characteristic of WPA is that the gain is doubly phase-sensitive—it is modulated at both the wave packet oscillation period and the optical period. The former time-dependence is a result of the periodic revivals of the pump-induced electronic polarization and the latter optical phase-sensitivity is a manifestation of the coherent nature of the molecular wave packet. The experiments to be described use a time-resolved upconversion method to detect the change in energy of a 50 fs probe pulse after it passes through a sodium heat pipe that has been pumped with another 50 fs pulse. The maximum saturated energy gain in this system is four and corresponds to all of the available energy being transferred from the wave packet to the probe pulse.
Amplification without inversion (AWI) in a resonant V-type system is studied using a dressed basis which reduces the coherent interaction of both involved optical transitions to that of a single two-level system. The transient AWI recently reported through a numerical analysis of the density matrix equations of the V-system in the bare atom basis (Zhu Y 1996 Phys. Rev . A 53 2742) is damped Rabi nutation with transient population inversion in this dressed basis. Although the transient AWI in the bare state basis occurs both with and without an incoherent pump field, the integrated probe gain is positive only in the first case.