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Second-harmonic generation in optically trapped nonlinear particles with pulsed lasers

Pulsed lasers are used for simultaneous single-beam three-dimensional optical trapping of and second-harmonic generation in 50--100-nm nonlinear particles. The emission power of the frequency-doubled light, the trapping stability, and the particle degradation are investigated for KTP and LiNbO3 particles trapped by 25-kHz-repetition-rate Q-switched Nd:YAG and 76-MHz mode-locked Ti:sapphire l a s e

Electronic structure of nanometer-scale semiconductor wires

We report a theoretical study of the electronic structure and optical properties of GaAs nanowires grown in the [111] direction with a hexagonal cross section, based on a tight-binding approach. It is shown that in the nanowires the degeneracy of the light-hole and heavy-hole bands at the Γ-point seen in the bulk material is lifted, and the light-hole state is located above the heavy-hole state, i

Rumänska på nätet: En solitär

”IT-baserad-Rumänska”-konceptet har visat sig vara en mycket bra utbildningsmodell bl a för att öka studentantalet. Vi presenterar vår e-lösning för att ”snappa upp” ”rest*-studenter” och därmed höja genomströmningen – ett moment som visar sig vara omöjlig inom campusmodellen. Vi presenterar våra resultat i en statistisk överblick. (*Studenter som har rest-prov.)

Deep Coherent Ray Tracing

Tracing secondary rays, such as reflection, refraction and shadow rays, can often be the most costly step in a modern real-time ray tracer. In this paper, we examine this problem by using suitable ray coherence measures and present a thorough evaluation of different reordering heuristics for secondary rays. We also present a simple system design for more coherent scene traversal by caching seconda

Contract Law in Sweden

Derived from the renowned multi-volume International Encyclopaedia of Laws, this practical analysis of the law of contracts in Sweden covers every aspect of the subject – definition and classification of contracts, contractual liability, relation to the law of property, good faith, burden of proof, defects, penalty clauses, arbitration clauses, remedies in case of non-performance, damages, power o