Parametric amplification and generation of ultrashort light pulses for spectroscopic applications

Abstract

PACS. 42.50.Dv -Nonclassical states of the electromagnetic field, including entangled photon states; quantum state engineering and measurements. PACS. 03.65.Ta -Foundations of quantum mechanics; measurement theory.Abstract. -We consider a realistic model for the one-atom micromaser consisting of a cavity maintained in a steady state by the streaming of two-level Rydberg atoms passing one at a time through it. We show that it is possible to monitor the robust entanglement generated between two successive experimental atoms passing through the cavity by the control decoherence parameters. We calculate the entanglement of formation of the joint two-atom state as a function of the micromaser pump parameter. We find that this is in direct correspondence with the difference of the Shannon entropy of the cavity photons before and after the passage of the atoms for a reasonable range of dissipation parameters. It is thus possible to demonstrate information transfer between the cavity and the atoms through this set-up.c EDP Sciences 1 √ 2 (|e + |g ) to |g and the other one to |e . These resultant states may now be detected, and the corresponding outcomes used to signify the states emanating from the cavity.

High dynamic range measurement of the pulse contrast in a Ti:sapphire/Nd:glass multiterawatt laser

“…To achieve this we can replace the third-order process by an optical parametric amplifier ( Figure 1), an approach similar to a technique already used to measure the amplitude and phase of weak, short pulses. 14,15 In this case, we speak of an optical parametric amplifier correlator (OPAC). 16 In this degenerate configuration the pump beam, at twice the original frequency, is used to amplify the seed beam, generating a third (idler) beam at the same fundamental frequency.…”