Laser Communications, while not a common form of amateur communications, has technical challenges that have intrigued talented amateurs for decades.

• A Laser Communications Primer -- Part 1
  QST September 1990, pp. 19-24
  A tutorial on lasers and how they work.
  
• A Laser Communications Primer -- Part 2
  QST October 1990, pp. 22-26
  Make a laser communications system from a laser tag game.
• Lasers and Amateur Radio  
  QEX January 1985, pp. 5-10
  An introduction to lasers.
  
• Laser Communication Range  
  QST April 1989, p. 74
  Calculating the range of a laser communications system.
• A Laser Transceiver for the ARRL 10-GHz-and-Up Contest  
  QEX November/December 2001, pp.11-19
  An optical transceiver you can build to get on the 6500-A band

• Bob Gonsett, W6VR Laser QSO
  Carrying voice over a 'RED POINTER' laser beam by Bob Gonsett, W6VR
• Amateur Radio Laser Communications