"See you later, Lukas!"

Translation: Bis später, Lukas!

[bigbobber51]

Bis bald , Lukas! doesn't work?

[az_p]

bald = "soon"

That sentence would fit in somewhere between bis gleich and bis später.

[Puett]

How about "tschüss"? Duo does not accept it, but it is very commonly used in Germany!