Investigation on the Cs 6S1/2 to 7D electric quadrupole transition via monochromatic two-photon process at 767 nm

The manipulation of the orbital angular momentum (OAM) contributes to understand the OAM multiplexing, is significant in free-space optical communication and information processing. We theoretically simulate and experimentally demonstrate the regularity of the OAM transfer, including the angular and radial modes, of Laguerre–Gaussian beam via four-wave mixing process in 85Rb vapor. The 420 nm coherent blue light output field inherits the phase characteristic of 780 nm and 776 nm beams with different OAM modes. The output field OAM modes show the transfer as a typical arithmetic operation of the input field OAM modes with equal-handed angular indice l, while, the conversion between angular and radial modes occurs with the opposite angular indice l. Such rules of the OAM transfer and manipulation have implications on the research of high-capacity information transfer and quantum communication.

Section: Experiments Setupmentioning

confidence: 99%

Manipulation of the orbital angular momentum via four-wave mixing in Rb vapor

Liu¹,

Wang²,

Yuan³

et al. 2023

“…interactions. These remarkable properties endow Rydberg atoms with tremendous potential in the fields of quantum information processing [1][2][3][4], quantum sensors [5,6], and the measurement of atomic fundamental physical constants [7,8].…”

Section: Introductionmentioning

confidence: 99%

Improvement of microwave electric field measurement sensitivity via dual-microwave-dressed electromagnetically induced transparency in Rydberg atoms

Yuan¹,

Jin²,

Wang³

et al. 2022

We present a mechanism for improving the sensitivity of microwave (MW) electric field (E-field) measurement using dual-MW-dressed electromagnetically induced transparency in a 5S 1/2–5P 3/2–56D 5/2–57P 3/2 85Rb atomic coherent system. An auxiliary MW (A-MW) field is introduced into the MW E-field measurement system, which consists of a probe, coupling lasers, and a target MW (T-MW) field. When the A-MW field frequency is tuned to be the same as the T-MW field and its power is adjusted to a suitable range, the T-MW field strength can be read out effectively. Finally, the sensitivity of MW E-field measurement is improved by about two orders of magnitude compared to that without an A-MW field. In addition, this mechanism is proven to be applicable for all frequency bands covered by Rydberg energy levels. This work opens up a novel pathway for the realization of high-sensitivity MW E-field measurement with Rydberg atoms.

“…A single comb source can provide tens of * Authors to whom any correspondence should be addressed. thousands of optical frequency modes, which is beneficial for parallelization in wavelength division multiplexed systems [4,5] as well as precise spectroscopy of atoms and molecules [6][7][8][9]. Meanwhile, extracting an individual pulse group while maintaining coherence and veracity is challenging but has urgent demands in arbitrary waveform generation and ultranarrow linewidth laser preparation [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Tailoring the pulse train of an optical frequency comb with a magnetized atomic medium

Yan¹,

Yuan²,

Wang³

et al. 2022

Selecting specific modes from the complete pulse train of optical frequency comb (OFC) is helpful in ultra-narrow linewidth laser preparation. Here, the mode selector for a commercial OFC based on the magnetized atomic medium is demonstrated in both theory and experiment. Only the comb modes with specific frequencies experience polarization rotation because of the Faraday effect, thus the mode tailoring can be realized by eliminating unchanged OFC modes via polarization selection. The theory study demonstrates the rich tunability of this device, and three specifically chosen operating conditions validate the system’s characteristics. The selected pulse group is distinguished in both optical and frequency spectrum, where spectral differences and bandwidth can be observed accordingly. Further, the selected pulse group and a continuous-wavelength laser stimulate an electromagnetically induced transparency spectrum in the hyperfine Paschen–Back regime to show the pulse group characteristics in detail. The method proposed provides the experimental foundation for producing narrow linewidth lasers from a polychromatic source with tailored results retaining the excellent characteristics of the original.