Ultra-precise timing and synchronization for large-scale scientific instruments

Xin, Ming; Şafak, Kemal; Kärtner, Franz X.

doi:10.1364/optica.5.001564

Cited by 50 publications

(21 citation statements)

References 97 publications

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“…The laser cavity incorporates 1.36m erbium-doped fiber (EDF) and 3.46m single mode fiber, so that the total cavity length is 4.82m. The dispersion is 65 ps 2 km -1 for EDF and -22 ps 2 km -1 for SMF at 1550nm, indicating a total dispersion of +0.012 ps 2 . The laser is mode-locked by nonlinear polarization rotation (NPR) technique 36 , facilitated through two polarization controllers (PCs) and a polarization dependent isolator (PDI).…”

Section: Resultsmentioning

confidence: 96%

“…The DTI is fabricated by two 1:1 optical coupler (OCs), dispersion compensation fiber (DCF) and SMF as extra fibers (EFs), and 12km SMF providing dispersion to time-stretch the pulse pair. The total length of EFs equals to the cavity length and their total dispersion EFs  < 0.0005 ps 2 . Compared with another DTI which contains a delay line in one arm, it can be inferred that the time separation diff r TT  =− .…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the linear relation between the roundtrip time change and relative phase jitter suggest that when tuning the repetition frequency, the pulse phase will be modulated synchronously. We hope these aspects should attract researchers' attention in the feedback control of frequency comb and precise timing 2,3 .…”

Section: Discussionmentioning

confidence: 99%

“…Ultrafast lasers 1 have developed rapidly over the past decades, owing to their comprehensive applications in many areas such as precise timing 2 , frequency comb 3 , photonic switching 4 , sensor and biomedicine 5 . The efficient mean to generate ultrashort pulses is to utilize mode-locking, in which a large number of longitudinal modes are locked together in the same phase to form the ultrashort pulse, even short down to few optical cycles 6,7 .…”

mentioning

confidence: 99%

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Time-resolved single-shot revealing pulse evolution dynamics in ultrafast lasers

Xian¹,

Wang²,

Zhan³

2021

Preprint

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Mode-locked lasers are the ideal source for precise measurements, from frequency combs to precise timing, which relies on the accurate control of the intracavity parameters in the lasers to stabilize the pulse. However, by the lack of accurate measurements, the interplays between intracavity parameters and the mode-locked pulse is still not real-time observable. Here, using the dispersive temporal interferometer, we report a method to single-shot probe the pulse evolution dynamics in time domain in the mode-locked laser. As a typical example, we demonstrate the first single-shot observation on the roundtrip time and phase evolutions of intracavity pulse during its buildup and relaxation. Three distinct evolution regimes for pulse buildup are unveiled for the first time. Moreover, the physical mechanism of the time-location and phase changes in these three regimes has also been analyzed, respectively. Our researches present a novel method to observe the intracavity-parameters-to-pulse interaction, which will improve laser design, ultrafast diagnostics, and nonlinear optics.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Time-resolved single-shot revealing pulse evolution dynamics in ultrafast lasers

Xian¹,

Wang²,

Zhan³

2021

Preprint

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“…4c ), combined with a superior thermal stability 34 , low nonlinear coefficient, and the recently demonstrated capacity to maintain pure polarisation states of NANFs 35 , can also impact the delivery of ultra-short pulses from Ti:sapphire laser systems operating around 850 nm. This could allow, for example, passive synchronisation with unprecedentedly high stability and low timing jitter between independent lasers, for use in pump-probe spectroscopy 63 , frequency metrology 64 , and for precise timing distribution within large scale facilities, e.g., free electron lasers 65 .…”

Section: Discussionmentioning

confidence: 99%

Hollow core optical fibres with comparable attenuation to silica fibres between 600 and 1100 nm

et al. 2020

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For over 50 years, pure or doped silica glass optical fibres have been an unrivalled platform for the transmission of laser light and optical data at wavelengths from the visible to the near infra-red. Rayleigh scattering, arising from frozen-in density fluctuations in the glass, fundamentally limits the minimum attenuation of these fibres and hence restricts their application, especially at shorter wavelengths. Guiding light in hollow (air) core fibres offers a potential way to overcome this insurmountable attenuation limit set by the glass’s scattering, but requires reduction of all the other loss-inducing mechanisms. Here we report hollow core fibres, of nested antiresonant design, with losses comparable or lower than achievable in solid glass fibres around technologically relevant wavelengths of 660, 850, and 1060 nm. Their lower than Rayleigh scattering loss in an air-guiding structure offers the potential for advances in quantum communications, data transmission, and laser power delivery.

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Stable Optical Frequency Comb Distribution Enabled by Hollow‐Core Fibers

Feng

Marra

Zhang

et al. 2022

Laser & Photonics Reviews

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Over the last two decades, optical frequency combs (OFCs) have enabled some of the most accurate measurements in physics. Distributing light from OFCs via optical fibers could make these high-accuracy measurement tools available more widely, from a few dedicated metrology laboratories to other laboratories and industry. However, the performance of distributed OFCs is strongly limited by impairments of standard single mode fiber (SMF), most notably its thermal sensitivity of chromatic dispersion, for which no compensation technique has been shown to date. To overcome this limitation, use of a new class of optical fiber is suggested here: a hollow core fiber (HCF), which offers more than an order of magnitude lesser such impairment. The measured OFC frequency stability of the optical mode and mode spacing reaches 1.8 × 10 −19 and 1.5 × 10 −17 at a few thousand seconds, respectively, after transmitting through 7.7 km of HCF. To the best of knowledge, this is the best ever performance for km-lengths of fiber-based OFC distribution. Besides, other HCF advantages over SMF in this application are discussed. Specifically, HCFs offer over an order of magnitude lower thermal sensitivity of propagation delay, several orders of magnitude lower optical nonlinearity, and almost ten times lower chromatic dispersion.

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Ultra-precise timing and synchronization for large-scale scientific instruments

Cited by 50 publications

References 97 publications

Time-resolved single-shot revealing pulse evolution dynamics in ultrafast lasers

Time-resolved single-shot revealing pulse evolution dynamics in ultrafast lasers

Hollow core optical fibres with comparable attenuation to silica fibres between 600 and 1100 nm

Stable Optical Frequency Comb Distribution Enabled by Hollow‐Core Fibers

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