The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Reversible light-matter interfaces are crucial elements in quantum optics and quantum information networks. In particular, the coupling of one-dimensional bosonic nanoscale waveguides and cold atoms appears as a promising pathway to build strong light-matter interaction thanks to the tight transverse confinement of light.
Optical frequency combs in space bear the prospect of dramatically improving satellite navigation and they may pave the pathway for various space applications like satellite formation flights, global satellite navigation, earth observation, and satellite-based fundamental tests of physical constants [1]. Here we report on a precision ranging system based on a dual-comb architecture aiming for fast...
Quantum dots based on InAs/InP hold the promise to deliver entangled photons with wavelength suitable for the conventional telecom window around 1550 nm [1]. This makes them predestined to be used in future quantum networks applications based on existing fiber optics infrastructure. A prerequisite for the efficient generation of such entangled photons is a small fine structure splitting (FSS) in the...
Fibre lasers display complex dynamical regimes which involve nonlinear interactions of millions of cavity modes. Recently, the transition to “optical turbulence” [1] (in analogy with the laminar-turbulence transition in hydrodynamic) was experimentally studied and was shown to be a phase transition which is accompanied by the occurrence of temporal correlations in the laser intensity with specific...
Uniform passive fiber-ring cavities are macroscopic devices which are known to exhibit dissipative modulation instability (MI) when driven in the rather large dispersion regime [1]. In a previous study we showed that in this regime, a simple modulation of the dispersion along the length of the ring cavity is responsible for the appearance of a new domain of parametric instability, related to Faraday...
It was shown that the spectral width of a nominally continuous wave Raman fiber laser (RFL) output becomes narrower after propagation in normal dispersion (β2>0) fiber [1]. This feature, attributed to Inverse Four-Wave Mixing (IFWM), was especially pronounced when the RFL output had a double-peak spectral shape caused by efficient FWM inside the cavity [2]. This spectrum was transformed into a...
Photoacoustic microscopy (PAM) is a promising imaging modality that combines optical and ultrasound imaging. It combines the advantages of high ultrasonic spatial resolution and high optical contrast. When a short laser pulse illuminates the tissue, absorbed light leads to an acoustic emission via thermoelastic expansion [1]. The laser system needs to generate short enough pulses, i.e., several nanoseconds,...
The ability to transfer entanglement over large distance is a main requirement for quantum networks. Another fundamental ingredient is the storage of such a quantum state in a quantum memory. To this end a useful resource is a photon pair for which one photon is resonant with the memory while its partner is at a low-loss telecommunication wavelength. We recently presented a photon pair source, compatible...
Making use of the attractive properties of silicon (Si), a wide array of highly functional photonic devices have been demonstrated over the past few decades [1]. Although planar platforms are still the most prominent choice for integrated systems, more recently silicon fibres have gained increased attention due to their simple fabrication methods and flexible device designs [2]. However, despite their...
Ring-type and whispering-gallery mode microresonators combine strong light confinement with high optical non-linearity to give rise to and enable efficient nonlinear optical parametric frequency conversion processes [1], stimulated Brillouin and Raman scattering.
Mid-infrared coherent sources at 3–4 μm have a wide variety of applications that include, but are not limited to gas sensing, material processing and production control. The MgO-doped periodically poled lithium niobate (MgO:PPLN) crystal is a well-known nonlinear element for quasi-phase-matched optical parametric oscillators (OPOs) typically pumped by 1-μm laser radiation [1]. However, strong multi-phonon...
Spectral compression (SC) by self-phase modulation in optical fibre has been known for a long time and has since been reported for various parameters [1]. In this paper, we analyse the impact of amplitude fluctuations and a degraded optical signal-to-noise ratio (OSNR) of the seed pulses on the SC process by means of extensive nonlinear Schrödinger equation numerical simulation. Remarkably, our results...
Nonlinear image up-conversion is an alternative for the acquisition of real-time and full unscanned 2D images at different spectral ranges of the infrared [1, 2] where sensors are not fully developed, as compared to existing imaging sensors in the visible in terms of noise, speed, resolution, or uncooled operation. Wavelength shift is accomplished through a sum-frequency mixing (SFM) process in a...
Multi-plane light conversion (MPLC) [1], [2] consists of a series of phase masks separated by a Fourier transform or free-space propagation and is illustrated conceptually in Fig. 1(a). Through this cascaded sequence of phase masks, and the diffraction which occurs between the masks, it is possible to implement arbitrary unitary spatial transformations. That is, any spatial input basis can be converted...
Controlling the interaction of light and matter is the basis for diverse applications ranging from light technology to quantum information processing. Nowadays, many of these applications are based on nanophotonic structures. It turns out that the confinement of light in such nanostructures imposes an inherent link between its local polarization and its propagation direction, also referred to as spin-momentum...
The Optical Frequency Comb (OFC) represents a cornerstone of precision metrology, because it provides a clockwork to down-convert hundreds of THz of optical frequency standards to the countable and traceable radio frequency (RF) domain. In particular, for a future redefinition of the Coordinated Universal Time by an optical atomic transition [1], it will be an essential ingredient. Nowadays, narrowband...
The continued remarkable advances in optical clocks and oscillators has led to a parallel strong development of optical clock networks [1]. Such networks have the potential to support a wide range of applications from basic time/frequency dissemination, to clock-based geodesy, to tests of general relativity [1]. To support optical clocks/oscillators at their highest accuracy and precision, these networks...
There are various arguments in favour of quantum key distribution (QKD) as a part of modern communications security [1], either to provide a “quantum enhancement” or to provide one of the unique properties offered by QKD, such as robust forward security [2]. Either way, we offer a QKD system which can be offered at low cost to a large number of users who wish to leverage QKD in whichever way they...
Modulation instability (MI) refers to a process where a weak periodic perturbation of an intense continuous wave (CW) grows exponentially as a result of the interplay between dispersion and nonlinearity. In its most basic manifestation, it can be observed in homogeneous optical fibers in the anomalous dispersion regime. Another kind of MI, named parametric instability (PI), is induced by the periodic...
Fibers are considered as extraordinary tabletop laboratories to investigate optical turbulence and optical rogue waves (ORW). However ultrafast measurement of random optical power fluctuations is a challenging experimental task and the typical sub-picosecond timescale prevented-up to now-time-resolved observations of the awaited dynamics. We report the first single-shot recordings of ORW emerging...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.