There are now virtually complete sets of drawings for two very popular commercial power supplies and associated laser heads as well as another laser head by itself:
Omnichrome 150R power supply and 532 laser head. This is functionally identical to and plug compatible with the American Laser Corporation 60X. (However, the original ALC power supplies are totally different electrically.) The ALC-60X/Omni-532 are the most common argon ion laser systems available on the surplus market. The power supply uses a switchmode regulator. The Omni-150P is virtually identical to the Omni-150R and the MWK Laser Products model MWK-APS appears to be a slightly simplified clone of the Omni-150 designs.
NEC GLG3030 laser head. This is another item that shows up on the surplus market. It uses an ion tube with internal mirrors but still has external mirror adjustments for fine tuning. While not directly compatible with the ALC/Omni power supplies, it can be adapted without too much trouble.
Lexel-88 power supply and laser head. Various versions of the Lexel-88 have been produced since the 1970s. After the ALC- 60X/Omni-532, the Lexels are the most common ion laser. The particular power supply included here uses a massive linear regulator running off of a 230 VAC front-end with very simple current and light control feedback loops. Therefore, modifications to adapt the basic design to your more modest needs should be quite straightforward.
The basic approaches used in the Omnichrome and Lexel designs are similar to those of a large number of other commercial ion laser power supplies though obviously, details may vary quite a bit. Portions of the SG-IL1 and SG-IY1 are based to varying degrees on modifications to these commercial power supply designs.
There are also various types of information on other ion lasers systems that aren't nearly as complete but should be useful when attempting to get a laser operational or to repair one without complete manuals or documentation. This includes some laser head diagrams and interconnect wiring descriptions for several systems.