Continuous argon and krypton gas laser sources are available commercially. By their nature they are bulky and relatively unmanageable in optical systems designed to focus on ocular tissues. By taking advantage of a simple geometric design of placing mirrors at diagonals of parallelograms, it is possible to provide maximum flexibility and minimum energy loss into such a system. The device is useful for producing microlesions in retinal vessels.
Behrendt T. Multiline Argon Laser. Arch Ophthalmol. 1971;85(3):355-358. doi:10.1001/archopht.1971.00990050357022