Two-wave mixing in sodium vapour

Grynberg, G.; Bihan, E. Le; Pinard, M.

doi:10.1051/jphys:019860047080132100

Cited by 44 publications

(14 citation statements)

References 28 publications

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“…This central structure corresponds to a two-wave mixing resonance [24] and its shape and width give indications on the response times of the dynamical modes of the molasses that are excited by the probe.…”

Section: Discussionmentioning

confidence: 99%

“…connected to the two-wave mixing resonances (also called stimulated Rayleigh or two-beam coupling resonances) that have been observed in atomic vapors [24,25,21]. These resonances are generally associated with the excitation of a slow atomic observable by the combined effect of a pump beam and a probe beam.…”

Section: E Rayleigh Resonances L Adiabatic Statesmentioning

confidence: 99%

“…O' =L '0 (24) where L is an operator acting on the density matrix. This operator describes the interaction between atoms and pump beams and encloses all the dynamical properties of the atomic medium.…”

Section: Introductionmentioning

confidence: 99%

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Probe transmission in one-dimensional optical molasses: Theory for linearly cross-polarized cooling beams

Courtois

Grynberg

1992

Phys. Rev. A

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We present a detailed theoretical investigation of the transmission spectrum of a probe beam interacting with atoms in a one-dimensional optical molasses obtained with linearly cross-polarized counterpropagating pump beams. The study is performed for a Jg = -, '~J , = 2 atomic transition in the limit where the Hamiltonian part of the atom-field coupling is predominant over the relaxation part. We analyze the stimulated Rarnan transitions occurring between different vibrational levels of the atoms in the periodic potential created by the light shifts, and we show a dramatic lengthening of the damping time of coherences between such levels due to the Lamb-Dicke effect. Very narrow Rayleigh resonances with a shape sensitive to the probe polarization appear for a probe frequency close to the pump frequency. We interpret these resonances in terms of scattering of the pump waves on density and magnetization gratings, and show that they provide important information about the dynamics and localization of atoms at the bottom of the potential wells. Such information should also be accessed by phase-conjugation experiments. Finally, indications on the treatment of other atomic transitions are given.

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Section: Discussionmentioning

confidence: 99%

Section: E Rayleigh Resonances L Adiabatic Statesmentioning

confidence: 99%

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Probe transmission in one-dimensional optical molasses: Theory for linearly cross-polarized cooling beams

Courtois

Grynberg

1992

Phys. Rev. A

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“…The output power observed in this measurement arises from one-photon-gain-based laser oscillation [9], as is seen from the fact that the maximum output power occurs for A f ^ -O//, corresponding to the peak of driven-atom one-photon gain. In addition, we have found that the laser threshold behavior is consistent with that expected for one-photon laser oscillation.…”

mentioning

confidence: 96%

“…1(a), and degenerate twophoton gain occurs at (o d -~ ft///2. Since this frequency is removed from spectral regions of strong one-photon gain [9], it is possible to selectively enhance two-photon gain using a high-finesse optical cavity. Note that the periodic structure of the dressed-atom energy spectrum guarantees relatively strong, near resonantly enhanced, degenerate two-photon transitions.…”

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confidence: 99%

Realization of a continuous-wave, two-photon optical laser

et al. 1992

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We report the first observation of continuous-wave two-photon iasing in the optical regime, and demonstrate that its initiation requires the injection of a trigger pulse into the laser resonator. Successful operation of the two-photon laser relies on the use of a novel gain medium consisting of laser-driven, two-level atoms and the use of a high-finesse optical cavity to isolate the two-photon gain from competing processes. Threshold conditions for laser action are in good agreement with recent theoretical predictions.PACS numbers: 42.50.Hz, 42.55.Hq, 42.65.Dr, 42.65.Pc Many of the unique properties of lasers derive from those of the stimulated emission (SE) process on which they are based. Virtually all existing lasers are based on the one-photon SE process-a SE event results in the creation of one new photon. Early on in the laser era, it was suggested [l] that lasers based on higher-order SE processes, wherein each SE event results in the creation of two or more photons, may be possible. It was predicted [2,3] that lasers based on higher-order SE processes possess operational characteristics qualitatively different from those found in normal (one-photon-SE-based) lasers. Unfortunately, tests of these predictions have not been possible, since efforts to realize lasers based on higher-order SE have themselves met with limited success [4]. A primary obstacle to the realization of higherorder-SE-based lasers is the tendency of higher-order SE processes to be weak both in absolute terms and in comparison to one-photon SE processes. In the microwave regime, the use of a unique gain medium and an extremely high-(? resonator has allowed researchers to achieve continuous-wave (cw), two-photon masing [5]. While masers are interesting in their own right, many of the intriguing predictions concerning two-photon lasers cannot be tested with them because their low-frequency photons are difficult to detect.Recently, it has been demonstrated [6] that stronglydriven two-level atoms display two-photon gain, and it has been predicted [7] that this gain can, under reasonable experimental conditions, be useful in the realization of a two-photon laser. We report in this Letter on the use of a driven-atom gain medium to provide the first demonstration of cw two-photon Iasing in the optical regime. The two-photon laser operates in the degenerate mode (both photons generated in the SE process have the same frequency) and displays dynamics that are dramatically different from those found in the case of normal onephoton-gain-based lasers.As discussed in detail elsewhere [6,7], the two-photon gain that arises in the driven two-level-atom system can be understood simply using the dressed-atom picture [8]. The dressed-atom energy eigenstates are shown in Fig. 1(a), where it is seen that the dressed-state doublets are separated in energy by ha)j, where coj is the driving-field frequency, and are split by h ft

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The Two-Photon Laser

Gauthier

Concannon

1994

NATO ASI Series

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Two-wave mixing in sodium vapour

Cited by 44 publications

References 28 publications

Probe transmission in one-dimensional optical molasses: Theory for linearly cross-polarized cooling beams

Probe transmission in one-dimensional optical molasses: Theory for linearly cross-polarized cooling beams

Realization of a continuous-wave, two-photon optical laser

The Two-Photon Laser

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