Optical and laser Homes of Yb:Y2SiO5 one crystals and discussion of the determine of merit pertinent to compare ytterbium-doped laser productsA fresh thio-germanium sulfide Li2Ga2GeS6 is synthesized for The 1st time and its construction was discovered to get isomorphous with AgGaGeS4, which is very well-known as a promising infrared NLO materials.