Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation A. Mathis, F. Courvoisier, L. Froehly, Furfaro, M. Jacquot, P. Lacourt, J. Dudley; Micromachining along a curve: Femtosecond laser micromachining of curved profiles in diamond silicon using accelerating beams. Appl. Phys. Lett. 13 August 2012; 101 (7): 071110. https://doi.org/10.1063/1.4745925 Download citation...

We generate arbitrary convex accelerating beams by direct application of an appropriate spatial phase profile on incident Gaussian beam. The calculation exploits the geometrical properties optical caustics and Legendre transform. Using this technique, sheet caustic with parabolic profiles (i.e. Airy beams), as well quartic logarithmic are experimentally synthesized from beam, we show compatibility material processing applications using imaging system to reduce main intensity lobe at sub-10...

Photonic Neural Network implementations have been gaining considerable attention as a potentially disruptive future technology. Demonstrating learning in large scale neural networks is essential to establish photonic machine substrates viable information processing systems. Realizing Networks with numerous nonlinear nodes fully parallel and efficient hardware was lacking so far. We demonstrate network of up 2500 diffractively coupled nodes, forming Recurrent Network. Using Digital Micro...

We use caustic beam shaping on 100 fs pulses to experimentally generate non-paraxial accelerating beams along a 60 degree circular arc, moving laterally by 14 \mum over 28 propagation length. This is the highest of transverse acceleration reported our knowledge. Using diffraction integral theory and numerical simulations, we show that trajectories represent unique class diffraction-free profile which also preserves femtosecond temporal structure in vicinity caustic.

Arbitrary shaping of the on-axis intensity Bessel beams requires spatial modulation both amplitude and phase. We develop a non-iterative direct space beam method to generate with high energy throughput from single phase-only light modulator. For this purpose, we generalize approach Bolduc et al. non-uniform input beams. point out physical limitations imposed on profile for unidirectional Analytical, numerical experimental results are provided.

There are many examples in physics of systems showing rogue wave behaviour, the generation high amplitude events at low probability. Although initially studied oceanography, waves have now been seen other domains, with particular recent interest optics. most studies optics focussed on how nonlinearity can drive emergence, purely linear effects also shown to induce extreme amplitudes. In this paper, we report a detailed experimental study an optical system, using spatial light modulator...

We report the observation of arbitrary accelerating beams (ABs) designed using a nonparaxial description optical caustics. use spatial light modulator-based setup and techniques Fourier optics to generate circular Weber subtending over 95 deg arc. Applying complementary binary mask also allows generation periodic ABs taking forms snake-like trajectories, application rotation caustic first experimental synthesis upon surface sphere in three dimensions.

The design, fabrication, and integration of micro-optical components for beam focus steering are demonstrated in an endoscopic optical coherence tomography (OCT) system. relevant components, a membrane-based microfluidic tunable microlens electrostatic 2-D scanning micromirror, fabricated using silicon polymer-based microelectromechanical system technologies. All assembled inside 4.5 μm diameter probe. design the system, including substantiation need focal length tunability, is presented,...

An effort to safeguard the legacy of optics includes a museum historical instruments, some dating 1845.

This paper presents a simple method based on the measurement of 3D intensity point spread function for quality evaluation high numerical aperture micro-optical components. The different slices focal volume are imaged thanks to microscope objective and standard camera. Depending optical architecture, it allows characterizing both transmissive reflective components, which either imaging part or component itself moved along axis, respectively. can be used measure length, Strehl ratio,...

Photonic networks are considered a promising substrate for high-performance future computing systems. Compared to electronics, photonics has significant advantages fully parallel implementation of networks. A approach large-scale photonic is realizing the connections using diffraction. Here, we characterize scalability such diffractive coupling in great detail. Based on experiments, analytically obtained bounds and numerical simulations considering real-world optical imaging setups, find...

We numerically investigate the spatiotemporal structure of Bessel beams generated with spatial light modulators (SLMs). Grating-like phase masks enable filtering undesired diffraction orders produced by SLMs. Pulse front tilt and temporal broadening effects are investigated. In addition, we explore influence wrapping show that SLM-generated femtosecond is similar to X-pulses at short propagation distance subluminal pulsed long distance.

This paper presents the study of a fabrication technique lenses arrays based on reflow glass inside cylindrical silicon cavities. Lenses whose sizes are out microfabrication standards considered. In particular, case high fill factor is discussed in detail since proximity between generates undesired effects. These effects, not experienced when sufficiently separated so that they can be considered as single items, corrected by properly designing Complete topographic well optical...

We report on the development of an ultrafast beam shaper capable generating Bessel beams high cone angle that maintain a high-intensity hot spot with subwavelength diameter over propagation distance in excess 8~mm. This generates focal region extremely aspect ratio exceeding 10~000:1. The absence intermediate focusing allows for shaping very energies, up to Joule levels. demonstrate proof principle application stealth dicing thick glass, 1~cm. expect this energy will have applications...

Summary This article introduces smart sample holders for optical microscopy. Their purpose is to allow the absolute determination of position observed zone with respect holder itself and a high accuracy. It becomes then straightforward find given interest by positioning coarsely microscope slide same coordinates. Furthermore images recorded during different observation sessions; i.e. slightly positions; can be processed numerically in order superimpose them Thus slight deviations orientation...

Control of the longitudinal profile ablated structures during laser processing is a key technological requirement. We report here on direct machining trenches in silicon with circular profiles using femtosecond accelerating beams. describe ablation process based an intensity threshold model, and show how depth can be predicted framework caustic description beam.

Abstract Ultrafast imaging is essential in physics and chemistry to investigate the femtosecond dynamics of nonuniform samples or phenomena with strong spatial variations. It relies on observing induced by an ultrashort laser pump pulse using probe at a later time. Recent years have seen emergence very successful ultrafast techniques single non-reproducible events extremely high frame rate, based wavelength frequency encoding. However, further progress towards resolution hampered lack...

We investigate the early stage of propagation Bessel-Gauss vortex beams where a transition regime shows progressive lateral expansion main intensity ring before reaching diffraction-free regime. The eikonal equation is used to characterize beam structure. featured by family hyperboloids with variable waists, generating tapered tubular caustic. Our analytical results are in excellent agreement numerical and experimental results. show can be well eliminated using hollow input beams.

Controlling the formation of high aspect ratio void channels inside glass is important for applications like high-speed dicing glass. Here, we investigate using ultrafast Bessel beams in single shot illumination regime. We characterize morphology damages as a function pulse energy, duration, and position beam fused silica, Corning Eagle XG, Gorilla While large set parameters allow operating window much more restricted XG The transient molten layer around voids enables us interpreting...

We present a setup to generate tightly focused Bessel beams that is composed of half-ball lens coupled with relay lens. The system simple and compact compared conventional imaging axicons based on microscope objectives. experimentally demonstrate the generation beam 42° cone angle at 980 nm in air typical length 500µm central core radius about 550 nm. numerically studied effects misalignment different optical elements range tilt shift are acceptable obtain regular beam.

The presented paper shows the concept and optical design of an array-type Mirau-based OCT system for early diagnosis skin cancer. basic sensor is a full-field, full-range coherence tomography (OCT) sensor. micro-optical interferometer array in Mirau configuration key element allowing parallel imaging multiple field views (FOV). focuses on performance single channel illumination array. In addition straylight analysis this given.

This paper presents a concept of an endomicroscope for early detection neoplastic lesions in the human stomach tissue, based on swept source optical coherence tomography (SS-OCT) and measurement probe with integrated Mirau micro interferometer. The system consists pigtailed illumination blocks, connected via Gradient Index (GRIN) lens collimator to micro-opto-electro-mechanical systems (MOEMS) (4 mm × 4 20 mm). technology interferometer is vertical multi-wafer bonding approach. MOEMS...