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Laser processing of polycrystalline porous graphite through micro- to millisecond pulses with 1 µm wavelength is investigated. The study aims at finding the best compromise between efficiency process (ablation rate) and quality (reduced heat-affected zone) for drilling cutting applications. Our experimental approach based on experiments involving a monomode kW ytterbium fibre laser (1080 nm) co...

We report a type of infrared switchable plasmonic quantum cascade laser, in which far field light in the midwave infrared (MWIR, 6.1 μm) is modulated by a near field interaction of light in the telecommunications wavelength (1.55 μm). To achieve this all-optical switch, we used cross-polarized bowtie antennas and a centrally located germanium nanoslab. The bowtie antenna squeezes the short wave...

We investigate the dynamics of double ionization of He atom by an intense near-infrared and an attosecond vacuum ultraviolet (VUV) laser pulse, which are either applied in sequence or at the same time. To this end we solve the time-dependent Schrödinger equation for a two-electron model atom interacting with the two fields. We compare the double-ionization yields and probability density distrib...

AgGaS2 has been used to generate more than 2 mW of cw mid-infrared radiation near 3.2 mm by differencefrequency mixing of the outputs of an extended-cavity diode laser near 795 nm (pump wave) an a compact diode-pumped Nd:YAG laser at 1064 nm (signal wave). An external ring enhancement cavity was used to build up the signal power inside the nonlinear crystal by as much as 14.5 times. The novel m...

The ability of photon to thermal conversion on wet chemically synthesized gold nanorods (GNRs) is a unique advantage to explore specific local heating. In this study, we demonstrate the thermal response of a single patterned GNR cluster in aqueous solution under near infrared irradiation. To improve the properties of GNRs, such as solubility, we describe the initiated chemical vapor deposition ...

High-repetition-rate (80-MHz) femtosecond infrared pulses are generated by difference frequency mixing (DFM) a femtosecond Ti:sapphire laser with a phase-locked synchronized cw mode-locked Nd:YAG picosecond laser. This DFM scheme is of particular interest for generating ultrashort near-IR pulses (~10 fs) because group velocity mismatch with a pump pulse can be ignored. The simplicity and the br...

Using a full-dimensional Monte Carlo classical ensemble method, we present a theoretical study of atomic nonsequential double ionization (NSDI) with mid-infrared laser fields, and compare with results from near-infrared laser fields. Unlike single-electron strong-field processes, double ionization shows complex and unexpected interplays between the returning electron and its parent ion core. As...