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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...
The study of the evolution of quantum states performed with photonic techniques, commonly requires the use of complex interferometric schemes [1]. Here we present a novel setup based on multipass bulk interference that allows to recreate and measure different kinds of quantum state evolutions, passing from sequential maps to quantum walks.
As new generations of diverse polymer materials become available [1], these are being used for an increasingly diverse variety of applications in optics, thereby allowing the realization of entirely new kinds of optical components and systems. Using manufacturing technologies based on MEMS and microsystems, flexible and stretchable materials may be used for the fabrication of components as diverse...
One of the cornerstones of quantum mechanics is that matter can possess both particle- and wave-like properties. Since the inception of quantum mechanics, such wavelike behaviour has been observed in ever more massive systems — ranging from electrons, neutrons, ultracold atoms, and even large molecules comprising many hundreds of atoms. An exciting route to further extend the exploration of quantum...
Research in micro-structured light has recently provided several exciting outcomes i.e., microscopy though turbid media or parallel micro-structuring of materials. Basically, applications on this topic rely on the use of spatial light modulators (SLM) for carrying out laser beam control at micrometric level. In this contribution we present simple and useful methods for both calibration and encoding...
We have realized a hybrid opto-electro-mechanical system [1], consisting of a radiofrequency (rf) resonato: capacitively coupled to a nanomechanical membrane, and read-out at the shot noise level by an optica interferometer. The oscillation of the mechanical resonator can alter the capacitance of the radiofrequency resonator leading to the modulation of transmitted signal. In our setup the rf resonator...
Low phase noise micro — mm waves are critical building blocks for future wireless communications and radar. Micro — mm waves generated by optical frequency combs via optical frequency division can have extremely low phase noise [1], but producible RF carrier frequencies are essentially limited to harmonics of the comb repetition frequency. Actively suppressing phase noise of RF oscillators is a more...
Substrate-transferred crystalline coatings represent an entirely new concept in high-performance optical interference coatings. This technology was developed as a solution to the long-standing thermal noise limitation found in ultrastable optical interferometers, impacting cavity-stabilized laser systems for precision spectroscopy and optical atomic clocks, as well as interferometric gravitational-wave...
Ultrafast transmission electron microscopy is a promising laser-pump electron-probe technique, which allows for studying ultrafast dynamics with both high spatial and temporal resolution [1]. Besides, the high spatial and temporal coherence of the pulsed electron beam enables a coherent manipulation of the free-electron quantum state [2] by inelastic scattering in optical near-fields [3-5]. Upon traversal...
Lab-on-a-chip (LoC) devices are extremely promising to bring diagnostic functions at the point-of-care. The LoC paradigm can be resumed in the will to emulate all the functionalities of a modern analysis lab onboard a portable platform, or at least a compact system, realizable at contained costs. At this scope, an important goal is the design of imaging schemes able to work out of the lab.
Ghost imaging (GI) exploits the intensity correlations of light to reconstruct an object. A “ghost image” is obtained by correlating the total transmitted or reflected intensity of an illuminated object with the intensity of a highly-correlated reference beam which itself doesn't interact with the object. Intriguingly, the spatial resolution of the image is provided by the non-interacting reference...
Reliable long-term operation of integrated quantum sensors employing atom interferometry in space imposes challenging requirements on the utilized technology and materials. In the last decade, the progress in miniaturization of each experimental subsystem (e.g., vacuum chamber with atom source, laser system and optics) greatly benefited from atom chip technology [1], micro integrated diode laser modules...
Porous materials are ideally suited for gas sensing, characterized by large effective surface area and allowing for adsorption and capillary condensation of volatile organic chemicals. Porous silicon (PSi) fabrication is easily controlled, leading to highly definable parameters such as porosity and refractive index. In practical cases however, PSi sensors suffer from a lack of selectivity problem...
Fourier-transform (FT) spectrometers [1] are widely employed in the infrared spectral region (FTIRs) due to the lack of cheap multiplex detectors. They use an interferometer (usually a Michelson) to create two time-delayed replicas of the incoming light. A single-pixel detector then records an interferogram (i.e. the overall incident energy as a function of the optical path difference)· whose FT directly...
Through generation of coherent extreme ultraviolet (XUV) radiation, high-harmonic generation (HHG) has opened up a wealth of possibilities for table-top research, ranging from attosecond dynamics to high resolution coherent imaging. The ability to perform interferometry with HHG sources would enable powerful coherent optical techniques such as Fourier transform spectroscopy in the XUV spectral range...
GaAs diode laser-based hybrid micro-integration technology meets the demand for precision spectroscopy applications in space for compact, robust, and energy-efficient laser modules. It supports applications at wavelengths ranging from 630 nm to 1200 nm and is already used for quantum optics experiments in space [1].
Optical frequency combs (OFCs) have led to an impressive number of achievements, including multi-heterodyne spectroscopy [1]. Mode-locked OFCs have been widely used due to their exceptional spectral bandwidth, but they usually require sophisticated locking methods to control the free spectral range (FSR) and the absolute frequency of the comb. A promising alternative is provided by electro-optic OFCs,...
Fourier transform (FT) spectroscopy [1] is a powerful technique to measure spectra in the time domain. With respect to frequency-domain spectrometers, FT spectrometers have the advantage of higher signal to noise ratio and optical throughput, and the possibility to adjust the frequency resolution. FT spectroscopy requires to generate two field replicas whose delay must be scanned with accuracy of...
Midinfrared frequency combs are a promising tool for new applications in chemical imaging and sensing, as they can directly access molecular vibrations in the molecular fingerprint wavelength region [1]. Practical laser sources are moving steadily from few micrometer wavelengths further into the fingerprint region to the 10 μm region. For practical applications of midinfrared light, difference frequency...
Applications of optical frequency combs in high precision metrology [1] require low-noise stabilization of its carrier-envelope offset (CEO) frequency. This task is commonly achieved via active feedback. Fully passive elimination of the CEO frequency based on difference frequency generation (DFG) between two octave-separated comb sections followed by amplification of the DFG signal in the EDFA has...
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