In addition to listening to the audience's laugh, you want to listen to their silence. Is it bored or interested silence? The silence is quieter and filled with energy when they're interested. You can hear a pin drop. When they're bored, you can always hear it.
When you take a pause before delivering your punch line, you will be using silence as a creative entity in itself.
You must not be afraid of small bits of silence. To use it well is the height of confidence and skill for a comedian. It increases the tension in a good way and adds contrast like a curveball complements the fastball of a good pitcher.