Raman Laser is the outcome,which was extracted from the scattered light for the process of Raman scattering,i.e.“3,2,and 1”-three levels,double photons and one elementary excitation,corresponding scattered photon for one of double photons; obvious,the “extraction” is key for this process,there are detailed expounded,i.e.physical course,structures of the things and their material,or other a series of problems,are presented,in this paper.Moreover,there are minutes set forth for the light’s quantum spin Hall effect,including the physical principles,experimental installations,new results and developing trend,also too.Finally,the opaque material of “light” is discussed,objectively.