- Planar geometry
Planar microchip laser had been reported in 1989 by Zayhowski and
Mooradian.
- Ring geometry
Ring microchip laser was realized by Byer and Kane in 1985.

Ring microchip laser is the key instrument in the LIGO project.
- Microchip laser arrays
Phase-locked arrays of microchip lasers were proposed in 1990 by author.

Unlocked microchip arrays were realized in 1992 by MIT Labs.
Phase-locked microchip arrays were realized in 1992 by Kubota group.
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