Frequency-stabilized Faraday laser with 10−14 short-term instability for atomic clocks

Chang, Pengyuan; Shi, Hangbo; Miao, Jianxiang; Shi, Tiantian; Pan, Duo; Luo, Bin; Guo, Hong; Chen, Jingbiao

doi:10.1063/5.0083390

Cited by 22 publications

(7 citation statements)

References 56 publications

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“…Compared with the 852 nm Faraday laser in ref. 36, the frequency stability of our system is about 4 times better both in the long-term and the short-term scales. In addition, because of the improved long-term stability, the laser frequency can be locked for at least three days, and the system can be used in outdoor applications with large temperature fluctuations.…”

Section: Mts Gradient(v/mhz)mentioning

confidence: 70%

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Frequency Stabilization of a Cesium Faraday Laser With a Double-Layer Vapor Cell as Frequency Reference

et al. 2022

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We implement a compact optical frequency standard at the wavelength of 852 nm by the modulation transfer spectroscopy (MTS) technique, using a Faraday laser as the local oscillator and a double-layer cesium vapor cell to provide frequency reference. The vacuum space between the two quartz glass layers of the double-layer atomic vapor cell can effectively suppress the temperature fluctuations inside the internal atomic vapor cell. The influences of probe and pump laser powers, modulation frequency, and vapor cell temperature on the slope of the MTS error signal are measured. Utilizing the self-estimation method, we evaluate the frequency stability of the laser system, which can be up to 5.8 × 10 −15 / √ τ at short term, dropping to 2.0 × 10 −15 at 50 s. This result is obviously superior to that using single-layer vapor cell as the frequency reference. Such an ultrastable laser source can be widely used in the fields of optical metrology and precision measurement.

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Section: Mts Gradient(v/mhz)mentioning

confidence: 70%

“…Thus, the MTS technique is widely used. For example, the 532 nm I 2 optical frequency standard based on MTS technique has been selected as a wavelength standard with high frequency stability [24], [25] [36].…”

Section: Introductionmentioning

confidence: 99%

Frequency Stabilization of a Cesium Faraday Laser With a Double-Layer Vapor Cell as Frequency Reference

et al. 2022

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“…The Faraday laser uses an anti-reflective coated laser diode as the gain medium and a Faraday atomic filter as the frequency-selective device [79]. The laser frequency can be stabilized within the transmission bandwidth of the atomic filter so that the laser linewidth can be narrowed effectively through optical feedback [80]. The AOC scheme is adopted to optimize the Faraday laser's frequency stability and named Faraday AOC [72].…”

Section: Faraday Type Two-level Aocmentioning

confidence: 99%

The development of active optical clock

et al. 2023

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The atomic clocks, whether operating at optical or microwave region, can be divided into two categories according to their working mode, namely the passive clocks and active clocks. The passive clocks, whose standard frequency is locked to an ultra-narrow atomic spectral line, such as laser cooled Cs beam or lattice trapped Sr atoms, depend on the spontaneous emission line. On the contrary, the active clocks, in which the atoms are used as the gain medium, are based on the stimulated emission radiation, their spectrum can be directly used as the frequency standard. Up to now, the active hydrogen maser has been the most stable microwave atomic clocks. Also, the Sr superradiant active atomic clock is prospects for a millihertz-linewidth laser. Moreover, the optical clocks are expected to surpass the performance of microwave clocks both in stability and uncertainty, since their higher working frequency. The active optical clock has the potential to improve the stability of the best clocks by 2 orders of magnitude. In this work, we introduce the development of active optical clocks, and their types is classified according to the energy-level structure of atoms for stimulated radiation.

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“…Ultra narrowband magneto-optical filters [27], which rely on complex refractive indices, are perfect candidates for non-Hermitian physics but have not yet been studied in this domain. Magneto-optical filters already see many applications in solar weather studies [28][29][30], laser frequency stabilization [31][32][33][34][35], LIDAR, [36][37][38], quantum hybrid systems [39], underwater optical communications [40] and ghost imaging [41]. Optimizing filters is a balance between maximizing transmission and minimizing bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Exploiting non-orthogonal eigenmodes in a non-Hermitian optical system to realize sub-100 MHz magneto-optical filters.

Logue¹,

Briscoe²,

Pizzey³

et al. 2023

Preprint

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Non-Hermitian physics is responsible for many of the counter-intuitive effects observed in optics research opening up new possibilities in sensing, polarization control and measurement. A hallmark of non-Hermitian matrices is the possibility of non-orthogonal eigenvectors resulting in coupling between modes. The advantages of propagation mode coupling have been little explored in magneto-optical filters and other devices based on birefringence. Magneto-optical filters select for ultra-narrow transmission regions by passing light through an atomic medium in the presence of a magnetic field. Passive filter designs have traditionally been limited by Doppler broadening of thermal vapors. Even for filter designs incorporating a pump laser, transmissions are typically less than 15% for sub-Doppler features. Here we exploit our understanding of non-Hermitian physics to induce non-orthogonal propagation modes in a vapor and realize better magneto-optical filters. We construct two new filter designs with ENBWs and maximum transmissions of 181 MHz, 42 % and 140 MHz, 17% which are the highest figure of merit and first sub-100 MHz FWHM passive filters recorded respectively. This work opens up a range of new filter applications including metrological devices for use outside a lab setting and commends filtering as a new candidate for deeper exploration of non-Hermitian physics such as exceptional points of degeneracy.

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Frequency-stabilized Faraday laser with 10−14 short-term instability for atomic clocks

Cited by 22 publications

References 56 publications

Frequency Stabilization of a Cesium Faraday Laser With a Double-Layer Vapor Cell as Frequency Reference

Frequency Stabilization of a Cesium Faraday Laser With a Double-Layer Vapor Cell as Frequency Reference

The development of active optical clock

Exploiting non-orthogonal eigenmodes in a non-Hermitian optical system to realize sub-100 MHz magneto-optical filters.

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