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Quantum Electronics and Laser Science Conference

Modulation transfer using coherent Raman scattering

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

Published Dec 10, 2005• 0 citations
Publisher

Abstract

We describe a scheme based on coherent Raman scattering for efficient transfer of amplitude and phase modulation from one frequency to another. Experimental results show bandwidths of at least tens of MHz and 99% fidelity.
DOI
10.1109/qels.2005.1548667

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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.
We optimize theoretically and experimentally the performances of the recently demonstrated modulation transfer protocol [D.-A. Trinh , Modulation transfer protocol for Rydberg rf receivers, ] aiming at extending the bandwidth of quantum rf receivers based on hot Rydberg atoms. This optimization relies on tuning the parameters of the phase modulation of the coupling beam, which is converted by the nonlinear response of the atoms into an amplitude modulation of the probe beam. We develop a theoretical model to optimize both the modulation frequency and the modulation amplitude of the coupling beam, thereby maximizing the atomic response. Once optimized, the sensitivity to detuned rf fields of this modulation transfer protocol is measured and compared with that of the conventional protocol. This comparison shows that the new protocol permits a strong increase in the detection bandwidth. Indeed, it outperforms the usual one as soon as the rf signal to be measured is detuned by more than a few MHz. We illustrate the capability of this modulation transfer protocol to enhance the detection bandwidth by showing experimentally how it permits bridging the gap between two Rydberg transitions separated by 166 MHz. In all cases, the experimental results are in good agreement with the simulations.
We optimize theoretically and experimentally the performances of the recently demonstrated modulation transfer protocol [D.-A. Trinh, K. V. Adwaith, M. Branco, A. Rouxel, S. Welinski, P. Berger, F. Goldfarb, and F. Bretenaker, Applied Physics Letters 125, 154001 (2024)] aiming at extending the bandwidth of quantum RF receivers based on hot Rydberg atoms. This optimization relies on tuning the parameters of the phase modulation of the coupling beam, which is converted by the nonlinear response of the atoms into an amplitude modulation of the probe beam. We develop a theoretical model to optimize both the modulation frequency and the modulation amplitude of the coupling beam, thereby maximizing the atomic response. Once optimized, the sensitivity to detuned RF fields of this modulation transfer protocol is measured and compared with that of the conventional protocol. This comparison shows that the new protocol permits a strong increase in the detection bandwidth. Indeed, it outperforms the usual one as soon as the RF signal to be measured is detuned by more than a few MHz. We illustrate the capability of this modulation transfer protocol to enhance the detection bandwidth by showing experimentally how it permits to bridge the gap between two Rydberg transitions separated by 166 MHz. In all cases, the experimental results are in good agreement with the simulations.