I agree with CEL. How is removing the diode going to magically make it stronger? It would also help to know what laser you are referring to. This is kind of like going to a general car forum and saying "Hey guys, I have a car. I want to make it faster. How do I do so?"
The most likely answer to your question is going to be buy another laser or build one yourself. Unless the manufacturer of the laser did something dumb like using a higher power diode than necessary(aka wasted money), you are only going to kill your laser much more quickly.