Art News Frequency – Chinese researchers have developed a pulsed optically pumped (POP) atomic clock with a frequency stability of 4.7 x 10
The achievement is remarkable because atomic clocks – often considered the most stable frequency standard for timekeeping – are critical components of global navigation systems and international communications services, and frequency stability is key to their accuracy.
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The research was led by Deng Jianliao of the Shanghai Institute of Optics and Fine Mechanics (SIOM) at the Chinese Academy of Sciences. The results were published in the Review of Scientific Instruments on April 21, 2020.
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“Atomic clocks use a quantum mechanical system as a ‘pendulum’ where the local oscillator frequency is locked to the transition between atomic energy states,” said Deng Jianliao, corresponding author of the paper. “The accuracy of the atomic clock depends on determining the accuracy of the atomic transition center and the stability of the center frequency itself.”
The new design uses a compact optical module consisting of a Distributed Bragg Reflector (DBR) laser and an acousto-optic modulator in a POP vapor cell with a rubidium atomic clock.
Containing the ics package in a sealed vacuum chamber improved temperature control and also reduced the negative impact of the barometric effect.
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Dunn noted that the atomic clock is “sensitive to fluctuations in many parameters,” making it challenging to optimize medium- to long-term frequency stability in laser-based vapor cell clocks such as POP clocks.
Seconds achieved by the new design “is comparable to the state-of-the-art POP rubidium clock,” according to the study.
More information: Qian Shen et al, A pulsed optically pumped atomic clock with medium- to long-term frequency stability of 10−15, Scientific Instruments Review (2020). DOI: 10.1063/5.0006187
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Citation: New POP atomic clock design achieves state-of-the-art frequency stability (2020, April 21) retrieved on April 18, 2023 from https:///news/2020-04-atomic-clock-state-of- the-art-frequency-stability.html
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We are committed to celebrating and uplifting Black culture, creativity and community throughout the year, with a special focus on the month of February in honor of Black History Month. This year we want to celebrate the multidimensionality of black listeners, artists and creators, truly embracing the breadth of black creativity – so we’ve created a space to bring it to life.
Introduction: Frequency presents the free studio. We’re building on Spotify’s existing commitment to black artists and creators by opening a short-term studio to host a diverse array of artists and creators. The space will consist of recording studios, video backdrops, green screen areas, blank canvases and more. It will provide a physical space to foster the creativity of emerging artists whose work is influencing mainstream culture. We will be posting more information soon, including the featured artists. In the meantime, check Frequency Hub on Spotify for recently updated playlists.
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What’s new. Host Lauren Simmons gives her two cents about her upcoming show Money Moves. An international team of researchers has been able to show that the three-dimensional Dirac material cadmium arsenide (blue-red cone) can multiply the frequency of a strong terahertz pulse (red line) by a factor of seven. The reason for this is the free electrons (red dots) in the cadmium arsenide, which are accelerated by the electric field of the terahertz lightning and thus in turn emit electromagnetic radiation. Credit: Helmholtz-Zentrum Dresden-Rossendorf
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When smartphones receive data and computer chips perform calculations, such processes always involve alternating electric fields that send electrons along well-defined paths. Higher field frequencies mean the electrons can do their work faster, allowing for higher data transfer rates and higher processor speeds. The current frontier is the terahertz range, so researchers around the world are eager to understand how terahertz fields interact with new materials. “Our terahertz facility TELBE at HZDR is an outstanding source for studying these interactions in detail and identifying promising materials,” says Jan-Christoph Deinert from the HZDR Institute for Radiation Technology. “A possible candidate is, for example, cadmium arsenide.
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) belongs to the group of so-called three-dimensional Dirac materials, where electrons can interact very quickly and efficiently, both with each other and with rapidly oscillating alternating electric fields. “We were particularly interested in whether cadmium arsenide also emits terahertz radiation at new, higher frequencies,” explains TELBE beamline scientist Sergey Kovalev. “We have already observed this very successfully in graphene, a two-dimensional Dirac