|
| related topics |
| {level, atom, field} |
| {light, field, probe} |
| {equation, function, exp} |
| {photon, photons, single} |
| {time, wave, function} |
| {wave, scattering, interference} |
| {cos, sin, state} |
|
New Consequences of Induced Transparency in a Double-Lambda scheme:
Destructive Interference In Four-wave Mixing
M. G. Payne, L. Deng
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.
- oai_identifier:
- oai:arXiv.org:quant-ph/0203076
- categories:
- quant-ph
- comments:
- Submitted to Phys. Rev. A, 7 pages, 4 figures
- doi:
- 10.1103/PhysRevA.65.063806
- arxiv_id:
- quant-ph/0203076
- created:
- 2002-03-15
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