An open-path optical communication system has either optical or laser sources and communicates between the source and a detector. In a first embodiment, the laser source includes a gas cell in the laser cavity to regulate laser wavelengths based on the minimum absorption between spectral lines of the...http://www.google.com/patents/US7126971?utm_source=gb-gplus-sharePatent US7126971 - Open-path laser/optical communication systems and methods utilizing wavelengths between atmospheric and gaseous absorption lines
