I was recently looking in lasers and and their uses and while watching Cosmos with Newton using a prism to shows the different colors of light from white light i got thinking. I stumbled onto the top optical or photonic computers a while ago and I decided to look into building one. After looking at current research it seems that most optical transistors and computers are being build in silicon on the small scale but little on the larger scale. I did some researched and figured with two lasers/sources one could use constructive and destructive interference to model on and off just as a transistor uses voltage to switch the current on and off can you not do the same with light. Right now part of the challenge seems to be building an all light transistor. Can anyone shed some light on this subject and would such an idea work?