http://www.digitimes.com/news/a20170519PD201.html
An interesting article regarding the demand for GaAs based VCSELs
LandMark Optoelectronics, TrueLight and Epistar expect growing use of VCSEL (vertical-cavity surface-emitting laser) 3D sensing in smartphone cameras to increase demand for GaAs-based epitaxial wafers used to produce VCSEL diodes, according to the companies.