Salvakalpa samadhi is absorption in eternity to the point where there is no real concept of self but there's still a karmic chain. Nirvikalpa samadhi is absorption in nirvana; concepts of self and no-self go away completely.
Frederick LenzThrough the practice of concentration and various techniques, we silence the mind and we enter into a flow of perfect light. We go outside of the parameters of mind and thought and experience nirvana.
Frederick Lenz