Advances in nonlinear optics have greatly expanded the utility of the laser 6. Using nonlinear crystals and frequency-conversion techniques such as frequency doubling 7 and quasi-phase matching (QPM) ...

Researchers have for the first time measured the first ionization energy of lawrencium, the last of the actinides, validating predictions of the element’s electronic structure (Nature 2015, DOI: ...

Question: We have a 15,000-gallon vinyl-lined pool equipped with an ionization system and sand filter. The copper level in the pool is recommended to be at 0.3 parts per million. It was much higher, ...