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Physical Review A

Transfer of amplitude and phase modulation to a different wavelength using coherently prepared sodium vapor

Ryan S. Bennink, Alberto M. Marino, Vincent Wong, Robert W. Boyd, Carlos R. Stroud

Published Aug 31, 2005• 11 citations
Publisher

Abstract

We present a scheme, based on coherent Raman scattering, to transfer the complete information content of an optical field from one spectral band to another with good efficiency, high fidelity, and large bandwidth. We demonstrate the transfer of both amplitude and phase modulation to new frequencies by scattering in a coherently prepared sodium vapor. The scattering process for this system has a bandwidth of at least tens of MHz and preserves the field envelope with a fidelity of 98%.

DOI
10.1103/physreva.72.023827

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We present a scheme, based on coherent Raman scattering, to transfer the complete information content of an optical field from one spectral band to another with good efficiency, high fidelity, and large bandwidth. We demonstrate the transfer of both amplitude and phase modulation to new frequencies by scattering in a coherently prepared sodium vapor. The scattering process for this system has a bandwidth of at least tens of MHz and preserves the field envelope with a fidelity of 98%.
We investigate theoretically a process of coherent Raman scattering in a medium where the coherence between two low- energetic levels is presented by adiabatic population transfer. In the present case the light induced moving optical grating can be formed by a periodical sequence of solitary-type waves (adiabatons). The parameters of this grating (propagation velocity, coefficients of spatial Fourier decomposition) are controlled completely by the amplitudes and phases of the two coupling fields at the medium entrance.
We study how coherent Stokes and anti-Stokes Raman scattering influence coherent population trapping. In an experiment using an atomic sodium vapor cell we observe induced transparency, induced absorption, and gain features, all of subnatural linewidth. The electromagnetically induced resonance is a peak or a dip depending on which side of the optical transition the fields are tuned to, and thus whether coherent anti-Stokes Raman scattering or coherent Stokes Raman scattering is the dominant process.
Quantum transduction, which enables the coherent conversion of quantum information between disparate physical platforms, is a cornerstone for realizing scalable and interoperable quantum networks. Among various approaches, parametric frequency mixing processes such as four-wave mixing (FWM) offer a promising pathway toward efficient and low-noise transduction. In this work, we demonstrate the feasibility of coherent quantum state transfer by indirectly verifying high-fidelity wavefunction's phase mapping (>99%) from the input field to the generated output field wave. Using a gas-filled hollow-core capillary fiber, we systematically investigate spectral phase evolution across a broad range, including infrared (IR) to ultraviolet (UV) transitions, as well as conversions from telecom-band (1550 nm) to visible (516 nm) and deep-UV (308 nm) wavelengths. Our results reveal that strong phase coherence can be maintained throughout these diverse conversion regimes. Because quantum properties such as coherence and entanglement are intrinsically encoded in both the amplitude and phase of a photonic wavefunction, preserving spectral phase is essential for faithful quantum information transfer. We further show that efficient and phase-preserving transduction can be achieved by tuning system parameters, offering valuable insights into nonlinear coupling dynamics. These findings establish a promising foundation for advancing FWM-based quantum transduction schemes and open new avenues for integrating heterogeneous quantum systems across wide spectral domains within future quantum communication networks.
Modulation features in the frequency domain can be transferred from an amplitude-modulated laser field to a nonmodulated one by a strong Raman coupling, which is based on refractive index control with a strong Raman coherence established with two sufficiently intense laser fields slightly off the two-photon Raman resonance of a selected Raman mode. Numerical simulations show that modulation transfers between the driving lasers, such as transfers from ultraviolet to extreme ultraviolet and from infrared to middle infrared lasers, can be realized in gaseous Raman media. This provides an efficient way to extend the optical modulation range beyond the transparent ranges of commercial modulators. Modulation features can also be transferred from a low-intensity driving laser to a high-intensity one, which ensures a direct application to modulate lasers with high intensities beyond the damage thresholds of standard modulators.