You Do Need power plug adapter while traveling from Netherlands 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 Netherlands are C and F. This is how they look like.

Netherlands

In Netherlands, outlets of type C and F are in use.

Type C

Type F

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