I am trying to Switch On/Off a laser that requires 2.7-3.3V to turn on. I have tried using BSH114,215 NMos. I have applied 3.3 Volts at the laser positive side and the negative side of the laser is connected to the drain of NMOS. and I am using 3.3V input from the controller to turn it on and off but it does not work. I have also applied 5V to the laser side also but it did not work.
Though It switches LED with 3.3V on the Laser side but does not power on Laser. As I am increasing voltages on the Laser side Vds increase but the voltage across Laser remains constant around 2.3V where it requires 3V to switch on.
I did LT-spice simulation (use resistor at the place of laser ) so it worked but with laser, it does not work.
Kindly give suggestions on how can I turn on the laser with a microcontroller using Mosfet with 3.3V to 5 volts power supply???