I'm trying to do a lab experiment with a laser but I need the light to be constant or it'll affect my data. I'm currently using a green laser (<5 mW, 532 nm) that uses two AAA batteries. Is there a way that I can connect the laser to a constant power supply? Or perhaps could someone direct me to a better laser? It would help if I didn't have to hold the button down and could just use a switch. I know almost nothing about lasers so please help! Thanks!