A5038909208- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Laser-Matter Interactions and Applications
- Advanced Fiber Optic Sensors
- Photonic Crystal and Fiber Optics
- Advanced Photonic Communication Systems
- Solid State Laser Technologies
- Advanced Frequency and Time Standards
- Mechanical and Optical Resonators
- Photorefractive and Nonlinear Optics
- Cancer Treatment and Pharmacology
- Nonlinear Photonic Systems
- Pulsars and Gravitational Waves Research
- Semiconductor Lasers and Optical Devices
- Geophysics and Gravity Measurements
- Terahertz technology and applications
- Astro and Planetary Science
- Atmospheric Ozone and Climate
- Stellar, planetary, and galactic studies
- Electron Spin Resonance Studies
- Photocathodes and Microchannel Plates
- Spectroscopy and Laser Applications
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
Swiss Center for Electronics and Microtechnology (Switzerland)
2016-2024
University of Geneva
2016-2021
Global Social Observatory
2018-2020
Supercontinuum generation and soliton microcomb formation both represent key techniques for the of coherent, ultrabroad optical frequency combs, enabling RF-to-optical link. Coherent supercontinuum typically relies on ultrashort pulses with kilowatt peak power as a source, so are often restricted to repetition rates less than 1 GHz. Soliton microcombs, conversely, have an conversion efficiency that is best at ultrahigh such THz. Neither technique easily approaches microwave domain, i.e., 10...
Photonics offer numerous functionalities that can be used to realize astrophotonic instruments. The most spectacular example date is the ESO Gravity instrument at Very Large Telescope in Chile. Integrated devices stand critical advantages for development, including extreme miniaturization, as well integration, superior thermal and mechanical stabilization owing small footprint, high replicability offering cost savings. Numerous technologies have been developed address shortcomings of...
Optical frequency combs are key to optical precision measurements. While most operate in the near-infrared regime, many applications require at mid-infrared, visible or even ultra-violet wavelengths. Frequency can be transferred other wavelengths via nonlinear processes, however, this becomes exceedingly challenging for high-repetition rate combs. Here, it is demonstrated that a synchronously driven high-Q microresonator with second-order nonlinearity efficiently convert visible, and...
Abstract Astronomical precision spectroscopy underpins searches for life beyond Earth, direct observation of the expanding Universe and constraining potential variability physical constants on cosmological scales. Laser frequency combs can provide required accurate precise calibration to astronomical spectrographs. For studies, extending with such astrocombs ultraviolet spectral range is desirable, however, strong material dispersion large separation from established infrared laser...
A broadband visible blue-to-red, 10 GHz repetition rate frequency comb is generated by combined spectral broadening and triple-sum generation in an on-chip silicon nitride waveguide. Ultra-short pulses of 150 pJ pulse energy, via electro-optic modulation a 1560 nm continuous-wave laser, are coupled to waveguide giving rise near-infrared supercontinuum. Modal phase matching inside the allows direct transfer supercontinuum into wavelength range covering more than 250 THz from below 400 above...
Abstract Optical soliton molecules are bound states of solitons that arise from the balance between attractive and repulsive effects. Having been observed in systems ranging optical fibres to mode-locked lasers, they provide insights into fundamental interactions underlying dynamics nonlinear systems. Here, we enter multistability regime a Kerr microresonator generate superpositions distinct pumped at same resonance, report discovery heteronuclear dissipative molecules. Ultrafast...
The capability to store light for extended periods of time enables optical cavities act as narrowband filters, whose linewidth corresponds the cavity’s inverse energy storage time. Here, we report on nonlinear filtering an pulse train based temporal dissipative Kerr solitons in microresonators. Our experimental results combination with analytical and numerical modeling show that soliton dynamics information about system’s physical state longer than time, thereby giving rise a filter width...
Optical frequency combs have become a very powerful tool in metrology and beyond, thanks to their ability link radio frequencies with optical via process known as self-referencing. Typical self-referencing is accomplished two steps: the generation of an octave-spanning supercontinuum spectrum frequency-doubling one part that spectrum. Traditionally, these steps been performed by separate components. With advent photonic integrated circuits, combination has possible single small monolithic...
The quest for extrasolar planets and their characterization as well studies of fundamental physics on cosmological scales rely capabilities high-resolution astronomical spectroscopy. A central requirement is a precise wavelength calibration spectrographs allowing extraction subtle shifts from the spectra stars quasars. Here, we present an all-fiber, 400 nm wide near-infrared frequency comb based electro-optic modulation with 14.5 GHz line spacing. Tests high-resolution, spectrometer GIANO-B...
Astronomical precision spectroscopy underpins searches for life beyond Earth, direct observation of the expanding Universe and constraining potential variability physical constants across cosmological scales. Laser frequency combs can provide critically required accurate precise calibration to astronomical spectrographs. For studies, extending with such astrocombs ultraviolet spectral range is highly desirable, however, strong material dispersion large separation from established infrared...
We enter the multi-stability regime of an optical microresonator to generate heteronuclear soliton molecules. Ultrafast electro-optical sampling reveals bound structures such molecules, despite comprising solitons dissimilar amplitudes, durations and frequencies.
One of the essential prerequisites for detection Earth-like extra-solar planets or direct measurements cosmological expansion is accurate and precise wavelength calibration astronomical spectrometers. It has already been realized that large number exactly known optical frequencies provided by laser frequency combs ('astrocombs') can significantly surpass conventionally used hollow-cathode lamps as light sources. A remaining challenge, however, generation with lines resolvable Here we...
Calibration of astronomical spectrographs with extreme precision enables the search for Earth-like exoplanets and quantifying expansion universe via radial velocity measurements. Laser frequency combs (astro-combs) [1], [2] provide adequate calibration markers this task. However, typical resolution on order 10 GHz requires these to operate at equivalently high repetition rates. Gen-erating broadband in regime becomes extremely challenging due low pulse energies that are available nonlinear...
Supercontinuum generation in optical fibers is one of the most dramatic nonlinear effects discovered, allowing short pulses to be converted into multi-octave spanning coherent spectra. However, generating supercontinua that are both and broadband requires simultaneously ultrashort with high peak power. This results a reducing efficiency increasing pulse repetition rate, has hindered at microwave line spacing, i.e. 10s GHz. Soliton microcombs by contrast, can generate octave-spanning spectra,...
Continuous-wave laser driven Kerr-nonlinear, optical microresonators have enabled a variety of novel applications and phenomena including the generation frequency combs, ultra-low noise microwaves, as well as, ultra-short pulses. In this work we break with paradigm continuous-wave drive use instead periodic, pico-second We observe deterministic stable femtosecond dissipative cavity solitons on-top resonantly enhanced driving pulse. Surprisingly, soliton pulse locks to enabling direct...
Precision astronomical spectroscopy is vital for seeking life beyond Earth and often relies on detecting very small wavelength shifts over years. of these instruments are ensured by regular calibration laser frequency combs stabilized with standards have recently emerged as suitable sources. In this work, we demonstrate an spectrograph in ultraviolet spectrum below 400 nm. This achieved using second- third- order nonlinear effects thin-film, periodically poled lithium niobate waveguides...
Mode-locked lasers, and in particular solid-state femtosecond are oscillators with a unique physics capable to exhibit extremely low-phase noise of the emitted pulse train. Here we report ultra-low phase microwave generation self-referenced, fully-stabilized mode-locked laser. The system involves 395-MHz repetition rate 1560nm laser which is self-referenced whose locked cavity-stabilized continuous-wave selfreferencing achieved f-3f nonlinear interferometer realized silicon nitride...
Temporal dissipative solitons in continuous-wave (CW) laser-driven Kerr-nonlinear microresonators have led to the generation of highly-coherent optical frequency combs and ultra-short pulses with repetition rates excess 10 GHz. Applications such sources include telecommunication, microwave signal spectroscopy. Here, a novel nonlinear Fabry-Perot microresonator is synchronously driven by picosecond laser (instead CW laser) resulting formation temporal at GHz rate. As opposed conventional...