The energy of one laser photon with wavelength of 535 nm is 1 W = 1 J/s, so that 10 mW is 0.01 J. Thus, the number of photons with an energy of 3.71 x 10^-19 J is Assuming a laser photon generated a electron-hole pairs(ehps), total generated electron-hole pairs is 2,69 x 10^16 ehps.