dorsal/arxiv
View SchemaNew Consequences of Induced Transparency in a Double-Lambda scheme: Destructive Interference In Four-wave Mixing
| Authors | M. G. Payne, L. Deng |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0203076 |
| URL | https://arxiv.org/abs/quant-ph/0203076 |
| DOI | 10.1103/PhysRevA.65.063806 |
Abstract
We investigate a four-state system interacting with long and short laser pulses in a weak probe beam approximation. We show that when all lasers are tuned to the exact unperturbed resonances, part of the four-wave mixing (FWM) field is strongly absorbed. The part which is not absorbed has the exact intensity required to destructively interfere with the excitation pathway involved in producing the FWM state. We show that with this three-photon destructive interference, the conversion efficiency can still be as high as 25%. Contrary to common belief,our calculation shows that this process, where an ideal one-photon electromagnetically induced transparency is established, is not most suitable for high efficiency conversion. With appropriate phase-matching and propagation distance, and when the three-photon destructive interference does not occur, we show that the photon flux conversion efficiency is independent of probe intensity and can be close to 100%. In addition, we show clearly that the conversion efficiency is not determined by the maximum atomic coherence between two lower excited states, as commonly believed. It is the combination of phase-matching and constructive interference involving the two terms arising in producing the mixing wave that is the key element for the optimized FWM generation. Indeed, in this scheme no appreciable excited state is produced, so that the atomic coherence between states |0> and |2> is always very small.
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"abstract": "We investigate a four-state system interacting with long and short laser\npulses in a weak probe beam approximation. We show that when all lasers are\ntuned to the exact unperturbed resonances, part of the four-wave mixing (FWM)\nfield is strongly absorbed. The part which is not absorbed has the exact\nintensity required to destructively interfere with the excitation pathway\ninvolved in producing the FWM state. We show that with this three-photon\ndestructive interference, the conversion efficiency can still be as high as\n25%. Contrary to common belief,our calculation shows that this process, where\nan ideal one-photon electromagnetically induced transparency is established, is\nnot most suitable for high efficiency conversion. With appropriate\nphase-matching and propagation distance, and when the three-photon destructive\ninterference does not occur, we show that the photon flux conversion efficiency\nis independent of probe intensity and can be close to 100%. In addition, we\nshow clearly that the conversion efficiency is not determined by the maximum\natomic coherence between two lower excited states, as commonly believed. It is\nthe combination of phase-matching and constructive interference involving the\ntwo terms arising in producing the mixing wave that is the key element for the\noptimized FWM generation. Indeed, in this scheme no appreciable excited state\nis produced, so that the atomic coherence between states |0\u003e and |2\u003e is always\nvery small.",
"arxiv_id": "quant-ph/0203076",
"authors": [
"M. G. Payne",
"L. Deng"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.65.063806",
"title": "New Consequences of Induced Transparency in a Double-Lambda scheme: Destructive Interference In Four-wave Mixing",
"url": "https://arxiv.org/abs/quant-ph/0203076"
},
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