The Laser Harp was first introduced by Bernard Szajner in 1981 but it was popularized by Jean Michel Jarre in his concerts. After seeing Jean in concert, Stephen Hobley decided he was going to make his own Laser Harp. 22 years later his Harp is completed and we have to say it is really impressive!
Full parts list, circuit diagrams, schematics and source code are now available for purchase in the online store, 22 years of research available now for only $19.
[Source] Build Your Own Laser Harp