Design and test of the microwave cavity in an optically-pumped Rubidium beam frequency standard

Liu, Chang; Wang, Yanhui

doi:10.1088/1674-1056/24/1/010602

Cited by 5 publications

(3 citation statements)

References 20 publications

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“…The detailed design of the Ramsey-type microwave cavity can be found in Ref. [17]. Its resonant frequency is 6.835 GHz, which is tunable in a range of 100 MHz.…”

Section: Experimental Set-upmentioning

confidence: 99%

Rubidium-beam microwave clock pumped by distributed feedback diode lasers

et al. 2017

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A rubidium-beam microwave clock, optically pumped by a distributed feedback diode laser, is experimentally investigated. The clock is composed of a physical package, optical systems, and electric servo loops. The physical package realizes the microwave interrogation of a rubidium-atomic beam. The optical systems, equipped with two 780-nm distributed feedback laser diodes, yield light for pumping and detecting. The servo loops control the frequency of a local oscillator with respect to the microwave spectrum. With the experimental systems, the microwave spectrum, which has an amplitude of 4 nA and a line width of 700 Hz, is obtained. Preliminary tests show that the clock short-term frequency stability is 7 × 10 −11 at 1 s, and 3 × 10 −12 at 1000 s. These experimental results demonstrate the feasibility of the scheme for a manufactured clock.

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“…The detailed design of the Ramsey-type microwave cavity can be found in Ref. [17]. Its resonant frequency is 6.835 GHz, which is tunable in a range of 100 MHz.…”

Section: Experimental Set-upmentioning

confidence: 99%

Rubidium-beam microwave clock pumped by distributed feedback diode lasers

et al. 2017

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“…Recently, metasurfaces (MS) have attracted growing interests of many researchers due to their planar profile, easy fabrication, and also strong beam control capacity. [1][2][3][4][5][6] Phase gradient metasurfaces (PGMS), proposed by Yu et al, [7] have found a wide range of applications, such as anomalous beam bending, [8][9][10] focusing, [11][12][13] and other optical devices. However, most reported metasurfaces suffer from a narrow bandwidth, which restricts their further applications, especially in planar antenna design.…”

Section: Introductionmentioning

confidence: 99%

Single-layer broadband planar antenna using ultrathin high-efficiency focusing metasurfaces

Hou

Wang

et al. 2017

Chinese Phys. B

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Phase gradient metasurfaces (PGMS) offer a fascinating ability to control the amplitude and phase of the electromagnetic (EM) waves on a subwavelength scale, resulting in new applications of designing novel microwave devices with improved performances. In this paper, a reflective symmetrical element, consisting of orthogonally I-shaped structures, has been demonstrated with an approximately parallel phase response from 15 GHz to 22 GHz, which results in an interesting wideband property. For practical design, a planar antenna is implemented by a well-optimized focusing metasurface and excited by a self-designed Vivaldi antenna at the focus. Numerical and experimental results coincide well. The planar antenna has a series of merits such as a wide 3-dB gain bandwidth of 15-22 GHz, an average gain enhancement of 16 dB, a comparable aperture efficiency of better than 45% at 18 GHz, and also a simple fabrication process. The proposed reflective metasurface opens up a new avenue to design wideband microwave devices.

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“…(iii) To reduce the cavity pulling effect in the rubidium SCAC, the loaded quality factor Q L of the interrogation cavity should be reduced, because the corresponding frequency shift is proportional to the square of Q L . [19][20][21] (iv) The phase difference of the two microwave interaction zones must be lower than 2.2 × 10 −5 rad because the frequency errors arising from the phase shift must be lower than 2.0 × 10 −16 in our rubidium SCAC. [4] (v) The microwave leakage effect should be avoided as far as possible by adding cutoff waveguides out of the interaction zones.…”

Section: Introductionmentioning

confidence: 99%

Microwave interrogation cavity for the rubidium space cold atom clock

et al. 2016

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The performance of space cold atom clocks (SCACs) should be improved thanks to the microgravity environment in space. The microwave interrogation cavity is a key element in a SCAC. In this paper, we develop a microwave interrogation cavity especially for the rubidium SCAC. The interrogation cavity has two microwave interaction zones with a single feedin source, which is located at the center of the cavity for symmetric coupling excitation and to ensure that the two interaction zones are in phase. The interrogation cavity has a measured resonance frequency of 6.835056471 GHz with a loaded quality factor of nearly 4200, which shows good agreement with simulation results. We measure the Rabi frequency of the clock transition of the rubidium atom in each microwave interaction zone, and subsequently demonstrate that the distributions of the magnetic field in the two interaction zones are the same and meet all requirements of the rubidium SCAC.

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Design and test of the microwave cavity in an optically-pumped Rubidium beam frequency standard

Cited by 5 publications

References 20 publications

Rubidium-beam microwave clock pumped by distributed feedback diode lasers

Rubidium-beam microwave clock pumped by distributed feedback diode lasers

Single-layer broadband planar antenna using ultrathin high-efficiency focusing metasurfaces

Microwave interrogation cavity for the rubidium space cold atom clock

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