We have developed a real-time terahertz time-domain polarization analyzer by using 80-MHz repetition-rate femtosecond laser pulses. Our technique is based on the spinning electro-optic sensor method, which we recently proposed and demonstrated by using a regenerative amplifier laser system; here we improve the detection scheme in order to be able to use it with a femtosecond laser oscillator wi...

Because of the unique laser–matter interaction processes involved, femtosecond laser micro-machining and femtosecond laser materials processing techniques are developing rapidly to stages where they may be introduced into manufacturing. Yet in both these areas, some complex interaction phenomena are not fully understood. In this talk we describe two studies of fundamental processes that impact ...

BACKGROUND Femtosecond-laser assisted clear cornea cataract surgery may hold promise in safer and more effective procedures. We decided to perform a comparative study to standard manual incision phacoemulsification surgery. METHODS This is a single-center, single-intervention, and prospective comparative data evaluation of 133 consecutive cases subjected to cataract surgery. Group-A (Phaco), ...

We report on fabrication of whispering-gallery-mode microlasers in a Nd:glass chip by femtosecond laser three-dimensional micromachining. The main fabrication procedures include the fabrication of freestanding microdisks supported by thin pillars by femtosecond laser ablation of the glass substrate immersed in water, followed by CO2 laser annealing for surface smoothing. The quality (Q) factor ...

Articles you may be interested in Ultrashort laser pulse induced nanogratings in borosilicate glass Appl. Grain boundary diffusivity of Ni in Au thin films and the associated degradation in electrical contact resistance due to surface oxide film formation The influence of laser-induced nanosecond rise-time stress waves on the microstructure and surface chemical activity of single crystal Cu nan...

Pulse shapes in a dispersive transparent material modulated by group-velocity dispersion, self-phase modulation, and self-focusing induced by a femtosecond laser light were observed directly with femtosecond timeresolved optical polarigraphy probing the induced instantaneous birefringence. The first observation of the state of femtosecond laser pulses about the interaction region inside the tra...

We describe a technique for femtosecond laser-assisted bag-in-the-lens (BIL) intraocular lens (IOL) implantation. Anterior capsulotomy and lens division into small pieces are performed by the laser. A fluid-filled interface makes it possible to re-dock the laser to the eye for posterior capsulotomy after the eye has been opened for lens aspiration without complications. The integrated optical c...

Surface physical changes (disorder and/or damage) due to femtosecond pulsed laser irradiation are observed in a new regime of extremely low laser fluence (,1023 of the single shot damage fluence) and large number of laser shots (.1010). No bulk damage was detected. The surface disorder is reversible by thermal annealing at 580 ±C. We propose a new mechanism for femtosecond laser-induced surface...

Ultrafast laser-induced refractive index changes in a-SiO2 consist, depending on the irradiation conditions, of either positive variations, voids, or regular nanoscale patterns, each of these underlying specific structural transformations. These allow for obtaining a large palette of optical functions ranging from low loss guiding to anisotropic scattering. While briefly reviewing the excitatio...

PURPOSE To compare femtosecond lenticule extraction and small-incision lenticule extraction to treat moderate to high myopia. SETTING Department of Ophthalmology, Aarhus University Hospital, Aarhus, Denmark. DESIGN Prospective clinical single-masked paired-eye study. METHODS An intrastromal lenticule was cut by a femtosecond laser and manually extracted. In femtosecond lenticule extractio...