A Dual-Frequency Faraday Laser

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

doi:10.1109/jphot.2020.3006503

Cited by 17 publications

(8 citation statements)

References 37 publications

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“…These qualities have already propelled FADOF to prominence within the optical domain, demonstrating exceptional performance. Despite its notable applications in diverse fields like thermometric LiDAR [21], [22], laser communication [23], Faraday laser [24], and ghost imaging [25], Till now, FADOF has yet to make an appearance within the realm of FMCW LiDAR.…”

Section: Introductionmentioning

confidence: 99%

Sunlight Noise Mitigation in FMCW LiDAR Using FADOF

Yin,

Tang,

Geng

et al. 2024

IEEE Photonics J.

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This paper examines the potential of utilizing a Faraday anomalous dispersion optical filter (FADOF) to enhance noise reduction in a FMCW LiDAR (Frequency-Modulated Continuous-Wave Laser Detection And Ranging) system. While the FMCW LiDAR itself demonstrates a certain level of robustness, it may fail to operate effectively in the presence of significant background noise interference. To address this challenge, we have proposed a validation experiment utilizing FADOF technology. Specifically, we have introduced a FADOF component at the optical receiving end of the FMCW LiDAR, and we have implemented a dynamic frequency stabilization method that combines frequency stability with frequency modulation for the laser source in the transmitter. By integrating FADOF into the FMCW LiDAR system to mitigate external noise, we conduct indoor and outdoor validation experiments. In the outdoor experiment, we introduce real sunlight background noise into the system, allowing it to directly illuminate the receiver. We then filter the light using FADOF and a 10 nm filter, separately. The experimental results confirm that the FMCW LiDAR system, when equipped with FADOF, can operate normally in intense background light noise, with a noise resistance capability at least twice as effective as the 10 nm filter. Additionally, the system achieves a detection range of at least 17 meters under direct sunlight conditions. This study has the potential to extend the application of LiDAR systems to more extreme environments with strong background noise, enabling their functionality in a broader range of scenarios.

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Section: Introductionmentioning

confidence: 99%

Sunlight Noise Mitigation in FMCW LiDAR Using FADOF

Yin,

Tang,

Geng

et al. 2024

IEEE Photonics J.

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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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“…Atomic filters are employed in an ever-growing range of applications, including single photon filtering [31,32], atmospheric lidar [33,34], designing frequency-selective lasers [35][36][37][38], ghost imaging [39], and optical communication [40,41]. In solar physics studies, filters are realised by cascading light through multiple thermal vapour cells [42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Voigt transmission windows in optically thick atomic vapours: a method to create single-peaked line centre filters

Briscoe

Logue

Pizzey

et al. 2023

J. Phys. B: At. Mol. Opt. Phys.

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Cascading light through two thermal vapour cells has been shown to improve the performance of atomic filters that aim to maximise peak transmission over a minimised bandpass window. In this paper, we explore the atomic physics responsible for the operation of the second cell, which is situated in a transverse (Voigt) magnetic field and opens a narrow transmission window in an optically thick atomic vapour. By assuming transitions with Gaussian line shapes and magnetic fields sufficiently large to access the hyperfine Paschen-Back regime, the window is modelled by resolving the two transitions closest to line centre. We discuss the validity of this model and perform an experiment which demonstrates the evolution of a naturally abundant Rb transmission window as a function of magnetic field. The model results in a significant reduction in two-cell parameter space, which we use to find theoretical optimised cascaded line centre filters for Na, K, Rb and Cs across both D lines. With the exception of Cs, these all have a better figure of merit than comparable single cell filters in literature. Most noteworthy is a Rb-D2 filter which outputs 92% of light through a single peak at line centre, with maximum transmission 0.71 and a width of 330 MHz at half maximum.

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A Dual-Frequency Faraday Laser

Cited by 17 publications

References 37 publications

Sunlight Noise Mitigation in FMCW LiDAR Using FADOF

Sunlight Noise Mitigation in FMCW LiDAR Using FADOF

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

Voigt transmission windows in optically thick atomic vapours: a method to create single-peaked line centre filters

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