i am buying Pulsed Laser Diode in Plastic Package 25 W Peak Power SPL PL90 and there is some parameters about semiconductors lasers.... Forward current = 40 A why all this current ???? then in the catalog Reverse voltage= 3 Volt then they say the Threshold current = 1A ??? what is the difference when i by the diodes what current should i apply 40 or 1 !!!!