LiF: F(2)- as a high repetition rate Ng: YAG laser passive modulator.
30-pps 30-mJ 10-ns FWHM pulses have been obtained in Nd:YAG laser systems with LiF crystal containing F(2)- color centers as the passive Q-Switch modulator. The saturation level of F(2)- color centers in the host crystal and the annealing phenomena of LiF: F(2)-(2) crystal were investigated. These observations make this room temperature stable color center crystal superb as a high power, high repetition rate neodymium laser passive modulator.
BRIEF COMMUNICATIONS: Use of passive switches in the generation of a train of nanosecond pulses by a neodymium glass laser
A train of nanosecond pulses was generated by a neodymium glass laser when a passive laser switch based on an LiF crystal with F/sup -//sub 2/ color centers was used to control the Q factor. The total radiation energy in a train reached 100 J, the number of pulses in a train exceeded 50, and the instability of the power and repetition frequency of the pulses was within 20--30%. It was found that, when used in the selected operating regime, switches of this kind were superior to passive switches composed of organic dye solutions.
RDF Keyword Search based on Keywords-To-SPARQL Translation
In this paper, we present a summary of our work on RDF keyword search. Given a set of keywords, our method automatically generates a set of candidate SPARQL queries, and their natural language description, to be evaluated on the RDF data graph. We discuss our approach, highlighting current and future directions.