Yago Arosa

Verified

Yago verified their affiliation via an institutional email.

Learn more

Verified

Yago verified their affiliation via an institutional email.

Learn more

• Phd in Optics-Physics
• PostDoc Position at University of Santiago de Compostela

We experimentally demonstrate that Townes solitons generated in a Nd:YAG crystal enable the formation of ultrafast nonlinear flying focus pulses that can be exploited for nonlinear fluorescence imaging. The power dependent longitudinal shift of the self-focusing point along the crystal, accompanied by a power-limiting effect caused by conical-wave...

We experimentally demonstrate that Townes solitons generated in a Nd:YAG crystal enable the formation of ultrafast nonlinear flying focus pulses that can be exploited for nonlinear fluorescence imaging. The power dependent longitudinal shift of the self-focusing point along the crystal, accompanied by a power-limiting effect caused by conical-wave...

Frustrated total internal reflection (FTIR) is analyzed from a novel perspective. Unlike similar works, the angle of incidence is used here as the experimental variable instead of the film thickness through which light tunnels. This method makes it possible to visualize not only the phenomenon of FTIR but also the resonance processes that occur for...

A coherent concatenation of multiple solitary waves may lead to a stable infrared and visible broadband filament in a ceramic YAG polycrystal. This self-trapped soliton train is leveraged to implement self-referenced multiplex coherent anti-Stokes Raman scattering (SR-M-CARS) imaging. Simulations and experiments illustrating the filamentation proce...

Coupled surface plasmons arise in the surfaces of a dielectric layer between two metallic media when a dim wave propagating in the dielectric generates resonant free charge oscillations at the interfaces. Here, we consider surface plasmon resonance in a Fabry-Perot type cavity with plane metallic mirrors and an inner dielectric medium, optically le...

A coherent concatenation of multiple Townes solitons may lead to a stable infrared and visible broadband filament in ceramic YAG polycrystal. This self-trapped soliton train helps implement self-referenced multiplex coherent anti-Stokes Raman scattering imaging. Simulations and experiments are presented in this work that help enhance the understand...

We experimentally study the spatial beam profile and the spectral broadening at the output of a multimode air–silica microstructure fiber taper, used along the direction of an increasing fiber diameter. By using a laser pump at 1064 nm emitting 60 ps Gaussian beam pulses, we observed a competition between Raman beam cleanup and Kerr beam self-clean...

By leveraging the power dependent behavior of the spatial self-focusing, we realize an ultrafast focusing adjustment in a nonlinear microspectroscopy system. Temporal shaping and encoding of incident pulse enable us to construct a 3D image of an object by implementing a single 2D scan.

In the last decade, the intrinsic tunability of ionic liquids has attracted interest well beyond the disciplines that inaugurated the research on these materials at the beginning of the 1990s. One of these emerging fields is photonics, where the possibility of designing materials with task-specific optical responses is promising for a large number...

We present experimental evidence (supported by numerical simulations) of the Goos-Hanchen effect and a nonlinear reflection process, after filament onset in Yttrium Aluminium Garnet. We then examine the dependence of these phenomena on input power.

A coherent concatenation of multiple Townes solitons may lead to a stable infrared and visible broadband filament in ceramic YAG polycrystal. This self-trapped soli-ton train helps implement self-referenced multiplex coherent anti-Stokes Raman scattering imaging.

We discuss new ideas for developing fiber light sources for nonlinear imaging. We demonstrate high-power SC-based laser tunable within fingerprint region, as well as new methods of tuning FWM sidebands.

We demonstrate how a narrowband pump and a broadband spectrum can be spatially multiplexed by selective coupling them in two distinct modes of a few-mode microstructure fiber. The first mode carries most of the input pump energy, and experiences spectral broadening. Whereas the second mode preserves the narrow bandwidth of the remaining part of the...

We experimentally demonstrate how a concatenation of the standard and microstructure fiber segments permits adjusting the four-wave mixing sideband position over a large spectral range by varying the chirp of an input pulsed pump at a fixed wavelength in the presence of a self-phase modulation. The blue- and redshifted sidebands can stand aside ove...

We experimentally demonstrate how a concatenation of standard and microstructure fiber segments permits adjusting the Four-Wave-Mixing sideband position over a large spectral range by varying the chirp of an input pulsed pump at a fixed wavelength. The blue- and red-shifted sidebands can stand aside over ~ 200 nm and ~ 450 nm from the pump, respect...

We experimentally demonstrate how a concatenation of standard and microstructure fiber segments permits adjusting the Four-Wave-Mixing sideband position over a large spectral range by varying the chirp of an input pulsed pump at a fixed wavelength. The blue- and red-shifted sidebands can stand aside over ~ 200 nm and ~ 450 nm from the pump, respect...

Hyperspectral spectroscopy requires light sources with wide spectral ranges from the visible to the mid-infrared. Here, we demonstrate the first fiber-based mid-infrared supercontinuum covering three octaves of frequency by leveraging 1-µm laser technology. The process consists in spectral broadening of a 1064-nm pump toward 0.48–2.5 µm in a graded...

We demonstrate that a low-intensity beam can be severely cleaned or distorted by a high-energy pump beam copropagating in a multimode optical fibre at different wavelengths. Thus, the M² coefficient of the weak beam is either enhanced or degraded relative to the pump intensity, allowing an ultra-fast light-by-light control. This unconventional deve...

We demonstrate how a narrowband pump and a broadband spectrum can be spatially multiplexed by selective coupling them in two distinct modes of a few-mode microstructure fiber. The first mode carries most of the input pump energy, and experiences spectral broadening. Whereas the second mode preserves the narrow bandwidth of the remaining part of the...

We experimentally demonstrate how a concatenation of standard and microstructure fiber segments permits to shift the Four-Wave-Mixing sidebands when changing the chirp of the input pulsed pump. The blue shifted sideband can span over 200nm.

Herein, a tellurite multimode optical fiber with a rectangular step‐index core to combine easy coupling of the pump power with the exceptionally cubic nonlinearity of such type of glass is developed. An alkali‐free composition (TeO2–ZnO–La2O3) is prepared to produce a preform with the use of both the stack‐and‐draw and the direct‐bonding methods. T...

We report a systematic study of the effect of the salt concentration and its valence on several equilibrium and transport properties of mixtures of the model protic ionic liquid ethylammonium nitrate with monovalent (LiNO3), divalent (Mg(NO3)2 and Ca(NO3)2), and trivalent (Al(NO3)3) salts. These properties, determined by appropriate experimental te...

We have built an experimental device with the aim to measure the expected electrical conductivity anisotropy in a liquid crystal, obtained from the gelation of the ionic liquid 1-ethyl-3-methyl imidazolium decyl sulfate, [EMIM][DSO4]. This ionic liquid has the particularity that it transits to a semi-solid gel state at room temperature when it cont...

Uncertainties of refractive and group index in dispersion measurement by spectrally resolved white light interferometry are deeply analyzed. First, the contribution to uncertainty of the different parameters affecting both indices is identified. Afterwards, results are presented for a 1.5 mm thick fused silica sample over a broad spectral range, fr...

Uncertainties of refractive and group index in dispersion measurement by spectrally resolved white light interferometry are deeply analyzed. First, the contribution to uncertainty of the different parameters affecting both indices is identified. Afterwards, results are presented for a 1.5 mm thick fused silica sample over a broad spectral range, fr...

A novel interferometric technique to measure small wedge angle of transparent windows is proposed. The technique is based on the measurement of the shift of the interference pattern generated by two sheared copies of a laser beam after crossing the optical wedge. A simple lens is used to combine the two beams in their focal plane and measurements a...

Different methods to determine the group index by measuring the material dispersion in spectrally resolved white-light interferometry were analysed. Four methods were investigated: computing the phase derivative directly, using the group index definition to calculate it from the refractive index derivative, locating the equalisation wavelength, and...

In this study, we aimed to measure material dispersion in fused silica using a low coherence interferometric method. The measurement was carried out quickly and efficiently in a wide spectral range using this method. The refractive index and group index of fused silica were determined by capturing a few interferograms. The material dispersion was m...

The material dispersion of the [Ckmim][BF4] (k = 2,3,4,6,7,8,10) family of ionic liquids is measured at several temperatures over a broad spectral range from 300 nm to 1550 nm. The experimental curves are fitted to a modified three-resonance Sellmeier model to understand the effect of temperature and alkyl chain length in the dispersion. From the p...

In this work, the refractive index dependence on the wavelength of 20 ionic liquids is characterised by spectrally resolved white-light interferometry in a spectral interval comprising a range of wavelengths from 400 to 1000 nm at different temperatures between 298.15 and 323.15 K. With these data and using a refractive index model based on a singl...

The material dispersion of the [Ckmim][BF4] (k = 2,3,4,6,7,8,10) family of ionic liquids is measured at several temperatures over a broad spectral range from 300 nm to 1550 nm. The experimental curves are fitted to a modified three-resonance Sellmeier model to understand the effect of temperature and alkyl chain length in the dispersion. From the p...

The ionic liquid 1-ethyl-3-methylimidazolium decylsulfate [EMIm][DSO4] is a salt that jellifies when it is mixed with a certain amount of water. In this hydrated state, it is a birefringent hydrogel that can be considered as a highly viscous ionic liquid crystal. In this paper, the liquid crystal phase of [EMIm][DSO4] and its birefringence dispersi...

Optical characterization is a fundamental part of the design and development of photonic devices, being the refractive index one of the most important magnitudes to be analyzed. The most spread refractometric techniques study the refractive index only at one wavelength. In order to characterize a wide spectrum, a huge quantity of measures at differ...

Ionic Liquids are materials with potential applications in many fields. However, their optical properties are scarcely studied. We propose and test an effective semi-empirical method to predict the refractive index dispersion of ionic liquids.

We present a new family of ionic liquids (ILs) with a common cation, 1-butyl-3-methyl imidazolium, the popular [BMIM] ⁺ (also written C 4 C 1 Im ⁺ ) and a variety of anionic complexes (also called adducts) based in thiocyanate (SCN) ⁻ : one blank compound, BMIM(SCN), and ten doped with metals having different oxidation states: Al ⁺³ , Mn ⁺² , Fe ⁺³...

A thorough analysis of the refractive index of 11 1-alkyl-3-methylimidazolium-based ionic liquids with three different anions, tetrafluoroborate (BF4), bis(trifluoromethylsulfonyl)imide (NTf2), and trifluoromethanesulfonate (OTf), is reported. Refractive indices were estimated, in the temperature interval from 298.15 to 323.15 K, using an Abbe refr...

We report a spectroscopic, structural, optical and magnetical characterization of tetra(1-butyl-3-methylimidazolium) hexaisothiocyanatonickelate. This paramagnetic ionic liquid exhibits reversible and continuous thermochromism from 298 K up to 400 K and it is solar responsive resisting numerous heating-cooling cycles. Its appearance changes from pa...

Continuous refractive index measurement in the UV spectral region and a small part of the Vis region (up to 520 nm) is performed by using white light spectral interferometry. The main limitations of operating in this region are the high dispersion and high absorption. The problems derived from high dispersion are overcome taking the data in several...

White light spectral interferometry is applied to measure the refractive index in absorbing liquids in the spectral range of 400–1000 nm. We analyze the influence of absorption on the visibility of interferometric fringes and, accordingly, on the measurement of the refractive index. Further, we show that the refractive index in the absorption band...

We design a spectrally resolved interferometer to measure the refractive index of transparent samples over a broad spectral range of 400–1550 nm. The measuring device consists of a Michelson interferometer whose output is analysed by means of three fibre spectrometers: a homemade prism spectrometer which obtains the interferogram generated by the s...

In this paper spectrally resolved white light interferometry is applied for measuring the refractive index of different ionic liquids over a wide spectral band from 400 to 1000 nm. The measuring device is compound by a Michelson interferometer whose output is analyzed by means of two spectrometers. The first one is a homemade prism spectrometer whi...

In this work, we address the phase ambiguity in white light spectral interferometry. This ambiguity prevents one from obtaining the refractive index over a broad spectral range with high accuracy. We first determine the error when the refractive index is fitted to a linear combination of power functions. We demonstrate that the error is proportiona...

In this paper we apply spectrally resolved white light interferometry to measure refractive and group index over a wide spectral band from 400 to 1000 nm. The output of a Michelson interferometer is spectrally decomposed by a homemade prism spectrometer with a high resolution camera. The group index is determined directly from the phase extracted f...

We performed a simple experience of additive color mixing using a glass and different colored cardboards. This experience can not only be used to describe color mixing, but to study and explain the optical properties of a transparent dielectric, such as glass, in a very visual way. This last one is the goal of the present paper.