Showing papers on "Electromagnetically induced transparency published in 1993"
TL;DR: It is found that an ensemble of atoms establishes transparency through a strong nonlinear interaction which, for a lambda system, tends to generate a matching temporal envelope on the complementary transition.
Abstract: In the last several years there have been studies and experiments showing how, by applying an additional laser beam, optically-thick transitions may be rendered nearly transparent to probing radiation. This transparency results from a quantum interference, very much like a Fano interference, which is established by the additional laser. This talk describes the difference between the quantum interference as exhibited by an independent atom and by an optically-thick ensemble of atoms. We find that an ensemble of atoms establishes transparency through a strong nonlinear interaction which, for a lambda system, tends to generate a matching temporal envelope on the complementary transition. For a ladder system, phase conjugate pulses are generated and, after a characteristic distance, establish transparency. The transparency of an optically-thick medium is therefore not a Beer`s law superposition of the independent atom response. To transmit a pulse through an otherwise opaque media, the front edge of the complementary pulse should lead, in the manner of {open_quotes}counter-intuitive{close_quotes} adiabatic transfer, the front edge of the pulse which is to be rendered transparent. Thereafter the pulses should be matched or, for a ladder system, phase-conjugately matched.
195 citations
TL;DR: In this paper, a nonlinear optical generation using electromagnetically induced transparency is demonstrated with atomic hydrogen as a test medium, where the generated sum-frequency Lyman-β radiation at 103 nm can continue to grow without suffering resonant absorption and phase mismatching.
Abstract: Nonlinear optical generation using electromagnetically induced transparency is demonstrated with atomic hydrogen as a test medium. With the application of a strong-coupling laser field to the 3p-2s transition, the resonant Lyman-β (3p-1s) transition becomes transparent. The generated-sum-frequency Lyman-β radiation at 103 nm can continue to grow without suffering resonant absorption and phase mismatching
94 citations
TL;DR: The observation of electromagnetically induced phase matching in collisionally broadened Pb vapor at a critical intensity at which the Rabi frequency of a dressing 1064-nm laser overcomes the Doppler broadening of the vapor.
Abstract: We report the observation of electromagnetically induced phase matching in collisionally broadened Pb vapor. At a critical intensity at which the Rabi frequency of a dressing 1064-nm laser overcomes the Doppler broadening of the vapor, the generated four-frequency-mixing signal at 283 nm increases in a steplike manner by a factor of 59.
43 citations
TL;DR: Radiative renormalization has been used to deduce and describe electromagnetically induced transparency succinctly in four-wave mixing for both one and two strong fields.
Abstract: Radiative renormalization has been used to deduce and describe electromagnetically induced transparency succinctly in four-wave mixing for both one and two strong fields. We find both additive and nested renormalization terms and give a prescription for obtaining renormalized expressions starting from perturbation theory solutions. The advantages of using a second strong field are also discussed.
8 citations
TL;DR: In this article, a three-level atomic scheme for resonantly enhanced sum frequency mixing is considered within which strong absorption of a fundamental input wave is the limiting factor on conversion, and it is shown that for the case where the other input field is sufficiently strong to cause electromagnetically induced transparency so reducing this parasitic absorption, there is still a significant second order susceptibility, and moreover the efficiency of the nonlinear process is greatly increased in the doppler broadened regime.
7 citations
TL;DR: It is shown that the achievable radiation temperature (or brightness) at the transparency is much greater than the atomic temperature, and the proposed transparency of the form recently proposed is implemented.
Abstract: We investigate spontaneous emission into an electromagnetically produced transparency of the form recently proposed [A. Imamoglu and S. E. Harris, Opt. Lett. 14, 1344 (1989)]. We show that the achievable radiation temperature (or brightness) at the transparency is much greater than the atomic temperature
5 citations
TL;DR: It is shown that the scheme is capable of producing light in a squeezed or coherent state close to a minimum-uncertainty state with a large mean amplitude and an enhancement of the conversion efficiency and a reduction of the added noise are found as a result of an electromagnetically induced transparency.
Abstract: We analyze the quantum-fluctuation properties of second-harmonic radiation generated in the high-efficiency conversion process used in a recent experiment by Hakuta, Market, and Stoicheff [Phys. Rev. Lett. 66, 596 (1991)]. We extend their work by studying the second-harmonic generation inside an optical cavity. The active medium inside the cavity is modeled by three-level atoms with degenerate upper levels (1s, 2p, and 2s states of atomic hydrogen) interacting with a strong constant electric field. An enhancement of the conversion efficiency and a reduction of the added noise are found as a result of an electromagnetically induced transparency. We show that the scheme is capable of producing light in a squeezed or coherent state close to a minimum-uncertainty state with a large mean amplitude
4 citations