Dinosaur-age Fossils Provide New Insights into Origin of Flowering Plants----Chinese Academy of Sciences english.cas.cn - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from english.cas.cn Daily Mail and Mail on Sunday newspapers.
Fossil seed-bearing structures preserved in a newly discovered Early Cretaceous silicified peat in Inner Mongolia, China, provide a partial answer to the origin of flowering plants, according to a study led by Prof. SHI Gongle from the Nanjing Institute of Geology and Paleontology of the Chinese Academy of Sciences (NIGPAS).
A group of researchers from the Shanghai Institute of Optics and Fine Mechanics (SIOM) of the Chinese Academy of Sciences recently came up with a new theory on the source of residual infrared absorption in Ti:sapphire laser crystals.
Chinese Academy of Sciences
Recently, a research group from Shanghai Institute of Optics and Fine Mechanics (SIOM) of the Chinese Academy of Sciences proposed a new theory on the origin of residual infrared absorption in Ti:sapphire laser crystals. The related research results have been published in Photonics Research on May 4, 2021.
Ti:sapphire (also called Ti-doped α-Al
2O
3) is one of the three basic laser crystal materials. Due to its excellent physical and chemical, spectral, and laser properties, Ti:sapphire has been one of the key materials for super-intense ultrafast laser devices.
Since the laser properties of Ti:sapphire was reported in 1982, the residual infrared absorption (with peak value around 800 nm), coincident with the laser emission band, has been the key problem affecting its laser emission efficiency. Therefore, the determination of the origin of residual infrared absorption has been a research hotspot in the community of Ti:sapphire laser crystals.