We demonstrate the first experimental realization of a dispersionless state, in photonic Lieb lattice formed by an array optical waveguides. This engineered supports three energy bands, including perfectly flat middle band with infinite effective mass. analyze, both experimentally and theoretically, evolution well-prepared flat-band states, show their remarkable robustness, even presence disorder. The states lattices opens exciting door towards quantum simulation models highly controllable...

Abstract Topological quantum matter can be realized by subjecting engineered systems to time-periodic modulations. In analogy with static systems, periodically driven topologically classified topological invariants, whose non-zero value guarantees the presence of robust edge modes. high-frequency limit drive, topology is described standard such as Chern numbers. Away from this limit, these numbers become irrelevant, and novel invariants must introduced capture transport. The corresponding...

Abstract The ability to record images with extreme temporal resolution enables a diverse range of applications, such as fluorescence lifetime imaging, time-of-flight depth imaging and characterization ultrafast processes. Recently, schemes have emerged, which require either long acquisition times or raster scanning requirement for sufficient signal that can only be achieved when light is reflected off an object diffused by strongly scattering medium. Here we present demonstration the...

We used ultrafast laser inscription to fabricate three-dimensional integrated optical transitions that efficiently couple light from a multimode waveguide two-dimensional array of single mode waveguides and back.Although the entire device has an average insertion loss 5.7 dB at 1539 nm, only 0.7 is due coupling losses.Based on analysis which presented in paper, we expect our should convert input into modes with 2.0 dB, assuming losses are zero.Such devices have applications astrophotonics...

Photonic lanterns are made by adiabatically merging several single-mode cores into one multimode core. They provide low-loss interfaces between and systems where the precise optical mapping individual modes is unimportant.

We report on the experimental realization of a uniform synthetic magnetic flux and observation Aharonov-Bohm cages in photonic lattices. Considering rhombic array optical waveguides, we engineer modulation-assisted tunneling processes that effectively produce nonzero per plaquette. This field for light can be tuned at will by varying phase modulation. In regime where half quantum is realized each plaquette, all energy bands dramatically collapse into nondispersive (flat) eigenstates are...

A fan-out device has been fabricated using ultrafast-laser waveguide-inscription that enables each core of a multicore optical fiber (MCF) to be addressed by single mode held in V-groove array (FVA). By utilizing the unique three-dimensional fabrication capability this technique we demonstrate coupling between an FVA consisting one-dimensional fibers and MCF two-dimensional cores. When coupled all cores simultaneously, average insertion loss per was 5.0 dB 1.55 mum spectral region....

We report the fabrication of single-mode buried channel waveguides for whole mid-IR transparency range chalcogenide sulphide glasses (λ≤11 μm), by means direct laser writing. have explored potential this technology fabricating a prototype three-dimensional three-beam combiner future application in stellar interferometry that delivers monochromatic interference visibility 99.89% at 10.6 μm and an ultrahigh bandwidth (3–11 μm) 21.3%. These results demonstrate it is possible to harness offered...

We experimentally demonstrate the photonic realization of a dispersionless flat band in quasi-one-dimensional lattice fabricated by ultrafast laser inscription. In nearest neighbor tight binding approximation, supports two dispersive and one nondispersive (flat) band. excite superpositions flat-band eigenmodes at input show diffractionless propagation states due to their infinite effective mass. future, use rhombic lattices, together with successful implementation synthetic gauge field, will...

Controlling the stress in glass after laser exposure is of prime importance not only for photonics applications, but also preserving mechanical integrity components general.The sub-surface fused silica to femtosecond pulses can induce a permanent and localized modification structure.In this work, we present evidence that be used continuously tailor material, from tensile compressive state, as pulse energy changed.In addition, demonstrate effect obtained while transitioning between different...

Ultrafast laser assisted etching (ULAE) in fused silica is an attractive technology for fabricating three-dimensional micro-components. ULAE a two-step process whereby ultrafast inscription (ULI) first used to modify the substrate material and chemical then remove modified material. In this paper, we present detailed investigation into how ULI parameters affect rate of channels planar surfaces written silica. Recently, potassium hydroxide (KOH) has shown potential outperform more commonly...

Waveguide structures are fabricated in z-cut lithium niobate (LiNbO3) using focussed femtosecond pulses. Two different types of waveguide structure depending on the pulse energy used. In first, guiding occurs regions directly surrounding a visible laser-damage region. second, material modification region created at focus. High confinement 1550nm is demonstrated first type but found to be temporary, thus indicating that least part refractive index change due phenomena such as stress subject...

Optical waveguides have been inscribed in periodically poled lithium niobate by femtosecond laser pulses with the multiscan technique. Second harmonic generation experiments from a fundamental wavelength of 1567nm demonstrate that nonlinear optical coefficient is preserved, yielding conversion efficiency 18%W−1.

We report high efficiency continuous wave laser oscillations at 1063.6 nm from an ultrafast written Nd(3+):GdVO4 channel waveguide under the 808 optical excitation. A record 17 mm·s(-1) writing speed was used while low propagation loss of (~0.5 dB·cm(-1)) enabled performance with a threshold pump power as 52 mW and near to quantum defect limited slope 70%.

We report picosecond laser welding of similar and dissimilar materials based on plasma formation induced by a tightly focused beam from 1030 nm, 10 ps, 400 kHz system. Specifically, we demonstrate the fused silica, borosilicate, sapphire to range including silicon, copper, aluminum, stainless steel. Dissimilar material glass aluminum steel has not been previously reported. Analysis borosilicate-to-borosilicate weld strength compares well those obtained using systems femtosecond lasers. There...

Previous reports of ultrafast laser welding glass-to-glass have indicated that a pre-existing optical contact (or very close to) between the parts to be joined is essential. In this paper, capability picosecond bridge micron-scale gaps investigated, and successful welding, without cracking, two glasses with gap 3 µm demonstrated. It shown maximum can welded not significantly affected by speeds, but strongly dependent on power focal position relative interface materials. Five distinct types...

We demonstrate laser action in diode-pumped microchip monolithic cavity channel waveguides of Yb:KGd(WO(4))(2) and Yb:KY(WO(4))(2) that were fabricated by ultrafast writing. The maximum output power achieved was 18.6 mW with a threshold approximately 100 from an waveguide operating at 1023 nm. propagation losses for this structure measured to be 1.9 dBcm(-1).

The authors report net gain from a channel waveguide fabricated in an Er:Yb-doped oxyfluoride silicate glass substrate using femtosecond laser inscription. To fabricate waveguides exhibiting low propagation and coupling losses, they used the recently demonstrated multiscan technique that allows cross section refractive index contrast to be controlled independently of each other. By doing so, best exhibited total background insertion loss, excluding absorption, only 1.2dB at 1537nm. As...

The application of photonics to astronomy offers major advantages in the area highly-multiplexed spectroscopy, especially when applied extremely large telescopes. These include suppression near-infrared night-sky spectrum [J. Bland-Hawthorn et al, Opt. Express 12, 5902 (2004), S. G. Leon-Saval Lett. 30, 2545 (2005)] and miniaturisation spectrographs so that they may integrated into light-path individual spatial samples Proc SPIE 6269, 62690N (2006)]. Efficient collection light from telescope...

We report the successful fabrication of a low-loss near-IR waveguide in polycrystalline ZnSe using ultrafast laser inscription. The waveguide, which was inscribed multiscan technique, supported well-confined mode at 1.55 μm. Propagation losses were characterized μm Fabry-Perot technique and found to be 1.07 dB · cm(-1) ± 0.03 cm(-1).

Using ultrafast laser inscription, we report the fabrication of a prototype three-dimensional 121-waveguide fan-out device capable reformatting output 120-core multicore fiber (MCF) into one-dimensional linear array. When used in conjunction with an actual MCF, demonstrate that function using this would result overall through put loss ≈7.0 dB. However, if perfect coupling from MCF could be achieved, only ≈1.7 With adequate development, similar devices efficiently reformat so-called "photonic...

We report systematic analysis and comparison of ps-laser microwelding industry relevant Al6082 parts to SiO2 BK7. Parameter mapping pulse energy focal depth on the weld strength is presented. The welding process was found be strongly dependent plane but has a large tolerance variation in energy. Accelerated lifetime tests by thermal cycling from -50° +90°C are Welds Al6082-BK7 survive over full temperature range where ratio expansion coefficients 3.4:1. Al6082-SiO2 (ratio 47.1:1) only limited range.

The spectral resolution of a dispersive spectrograph is dependent on the width entrance slit. This means that astronomical spectrographs trade-off throughput with resolving power. Recently, optical guided-wave transitions known as photonic lanterns have been proposed to circumvent this trade-off, by enabling efficient reformatting multimode light into pseudo-slit which highly in one axis, but diffraction-limited other. Here, we demonstrate successful telescope point spread function such slit...

The year 2015 marked the 25th anniversary of modern ultrafast optics, since demonstration first Kerr lens modelocked Ti:sapphire laser in 1990 (Spence et al Conf. on Lasers and Electro-Optics, CLEO, pp 619–20) heralded an explosion scientific engineering innovation. impact this disruptive technology extended well beyond previous discipline boundaries lasers, reaching into biology labs, manufacturing facilities, even consumer healthcare electronics. In recognition such a milestone, roadmap...