You Do Need power plug adapter while traveling from Gabon to Laos.

Here is Why You Need An Adapter

The outlet and plug type used in Laos are A, B, C, E and F and in Gabon is C. This is how they look like.

Gabon

In Gabon, outlets of type C are in use.

Type C

Laos

In Laos, outlets of type A, B, C, E and F are in use.

Type A

Type B

Type C

Type E

Type F