Defect formation and mitigation during laser powder bed fusion of copper

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Chip-based, single-frequency and low phase-noise integrated photonic laser diodes emitting in the violet (412 nm) and blue (461 nm) regime are demonstrated. The GaN-based edge-emitting laser diodes were coupled to high-quality on-chip micro-resonators for ...

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Materials that efficiently promote the thermodynamically uphill water-splitting reaction under solar illumination are essential for generating carbon-free ("green") hydrogen. Mapping out the combinatorial space of potential photocatalysts for this reaction ...

In semiconductors, exciton or charge carrier diffusivity is typically described as an inherent material property. Here, we show that the transport of excitons among CsPbBr3 perovskite nanocrystals (NCs) depends markedly on how recently those NCs were occup ...

Ultrashort laser pulses, i.e., pulses emitted shorter than a picosecond, can tailor material properties by introducing permanent modifications locally in three dimensions. Remarkably, under a certain exposure condition, these modifications are accompanied ...

We report the first, to our knowledge, observation of the nonlinear phenomenon known as modulation instability (MI) in a coherently driven fiber resonator pumped at 1972 nm. To compensate for the very high losses in this spectral region, we have integrated ...

During the last two decades, ultrafast in-volume laser-based processing of transparent materials has emerged as a key 3D-printing method for manufacturing a variety of complex integrated photonic devices and micro-parts. Yet, identifying suitable laser pro ...

Since the dawn of humanity, human beings seeked to light their surroundings for their well-being, security and development. The efficiency of ancient lighting devices, e.g. oil lamps or candles, was in the order of 0.03-0.04% and jumped to 0.4-0.6% with th ...

Additive Manufacturing also commonly referred as 3D printing has been given a lot of interest lately. Market is growing exponentially and the aim for obtaining more complex and ready-to use parts is emerging. All the 3D printing processes consist in buildi ...

Chip -scale optical frequency combs enable the generation of highly -coherent pulsed light at gigahertz-level repetition rates, with potential technological impact ranging from telecommunications to sensing and spectroscopy. In combination with techniques ...

Defect formation and mitigation during laser powder bed fusion of copper

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Single-frequency violet and blue laser emission from AlGaInN photonic integrated circuit chips

Thermal conductivity of Li 3 PS 4 solid electrolytes with ab initio accuracy

Cavitation induced by pulsed and continuous-wave fiber lasers in confinement

Data-Intensive Exploration of the Photoelectrochemical Responses of Main-Group Metal Sulfides

Persistent enhancement of exciton diffusivity in CsPbBr3 nanocrystal solids

Femtosecond laser-induced modifications and self-organization in complex glass systems

Observation of modulation instability in a coherently driven active fiber ring resonator at 2 µm wavelength

Third-harmonic generation monitoring of femtosecond-laser-induced in-volume functional modifications

III-N blue-emitting epi-structures with high densities of dislocations: Fundamental mechanisms for efficiency improvement and applications

A hybrid Selective Laser Sintering based process for the additive manufacturing of architectured composites

Dissipative Kerr soliton generation at 2μm in a silicon nitride microresonator