Nondegenerate phase-conjugate wave via stored atomic coherence based on electromagnetically induced transparency in solids

Abstract

A nondegenerate phase-conjugate wave was generated via stored atomic coherence in a Pr 3+ :Y 2 SiO 5 crystal based on the electromagnetically induced transparency effect, and its capability for wave-front reconstruction of phase distortion was demonstrated experimentally. The phase-matching condition during the storage-retrieval process of the phase-conjugate wave was characterized both experimentally and theoretically in detail. Theoretical simulations fit the experimental data very well. Such a scheme of storage and retrieval of the phase-conjugate wave may have potential applications in optical signal processing and information security.

High visibility first-order subwavelength interference based on light pulse storage via electromagnetically induced transparency

“…The Pr:YSO crystal was employed as the EIT media, and two lower levels | b 〉, | c 〉 and one upper level | a 〉 of the hyperfine transition 1 D 2  ↔  3 H 4 (~605.78 nm) of Pr 3+ ions, as shown in Fig. 1(b), were chosen to form the Λ-type three-level configuration 37, 38 . The crystal was kept at 3.6 K in a cryostat and was placed in the rear focal plane of lens L1 with a focal length f 1  = 30 cm.…”

“…After a certain time delay (~3  μ s in our experiments, less than the 30- μ s storage time of light pulse in Pr:YSO crystal at 3.6 K), the interference field of the double-slit could be recovered by launching a Gaussian readout beam E R along the coupling beam under the phase-matching condition. Detailed procedure to prepare the EIT condition and to store and retrieve the signal light pulse can be found in refs 37, 38. The light intensity distribution on the output surface of Pr:YSO crystal was imaged through lens L2 with a focal length f 2  = 10 cm and recorded by an intensified charge-coupled device (ICCD) camera.

Figure 1( a ) The schematic diagram of experimental setup to observe the subwavelength interference of a double-slit through EIT-based light pulse storage and retrieval.

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Coherent Optical Field Manipulation and Optical Information Processing Based on Electromagnetically-Induced Transparency Effect in Pr3+:Y2SiO5 Crystal

“…Similar to the conventional holographic gratings, the retrieval of the stored light pulses is of high angular and spectral selectivity [24,63], as shown in Figure 3, where the full width at half maximum (FWHM) of the angular rocking curve and the spectral detuning rocking curve were measured to be ∼1 o and 2 MHz, respectively, in the 3-mm Pr:YSO crystal at 3.4 K. Angular and spectral selectivity are the requirements of the phase matching condition during the light pulse storage and retrieval process.…”

“…∆θ is the angular detuning deviated from the phase matching condition, δ R is the frequency detuning with respect to the central frequency of the signal pulse. Figure adapted from reference [63].…”

Multiplexed image storage by electromagnetically induced transparency in a solid

“…However, all of these classical techniques are not suitable for quantum state storage, as they apply dissipative or amplifying elements [14,15]. Hence, multiplexed storage of light pulses based on coherent light-matter processes from the background of quantum optics (e.g., EIT) gained considerable attention in recent years [16][17][18][19].…”