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These are photos of Amoco DPSS lasers, presently only the 532-EH-50. While Amoco was/is known as an oil company ;-), at one time in the past they were a manufacturer of high quality lasers for NASA, among others.
More information on these Amoco DPSS lasers can be found in the chapter Solid State Lasers of Sam's Laser FAQ.
Amoco 532-EH-50 System
The 532-EH-50 is a 50 mW (rated) 532 nm (green) DPSS laser with a TEM00 beam profile. The samples I've tested were also Single Longitudinal Mode (SLM) / single frequency, though it is not known if this is spec'd.
The Web Album of the laser head is a composite of components from two systems: an intact head and only the laser assembly from another one. That's why there are some suble differences, but most would be unnoticeable. The controller is for these heads but wasn't tuned for either one. Descriptions under each photo provide more information on what it is.