(The following photo provided courtesy of: Dave (Ws407c@aol.com).)
If you are really interested in the much more complex green laser pointers, go to the Dissection of Green Laser Pointer Gallery wing and check out the very detailed photos there.
Typical Red Laser Pointer is a diagram of a unit containing a module similar to those below.
(The following 3 photos and description provided courtesy of: Curt Graber (firstname.lastname@example.org).)
(The following photo provided courtesy of: Musser and Associates, Inc.)