Pulsing with PWM, and dimming?

Hi!

I'm a noob when it comes to lasers, I'm doing a DIY spirograph, see the thread here.

The laser modules I've ordered from ebay has built in drivers, do I need a special driver in order to pulse it with a pwm? I was planning to connect the 5V power supply to PWM, then from PWM to 5V input on the driver.


And is it possible to dim a laser?