Good idea. And we do have plans of making an alexandrite related directory, including synthetic alexandrite manufactures, rods and laser equipment producers. Anyway, here is some companies you can contact:
Candela, Inc. http://www.candelalaser.com/
Manufacture of Q-switched 755nm alexandrite laser system. (Candela GmbH in Germany)
Cynosure, Inc. http://www.cynosurelaser.com/
Developer and producer of Apogee 5500 long pulse alexandrite laser.
Light Age, Inc. http://www.lightage.com/
This company is preeminent developer of alexandrite laser technology, in USA
Lumenis Ltd. http://www.lumenis.com/
Developer of medical and aesthetic lasers and light-based technology.