The plot shown below is the power dependence of the amplified photocurrent noise at 50 MHz within a BMHz bandwidth measuring for a Ti:Sapphire laser having a emission wavelength centered 930nm. If the laser was operated at 20mW of outputted optical power, the photodiode has a responsivity 0.4 A/W. The amplifier is a impedance matched photodiode at 50 ohms, shown below, calculate: a.) Quantum efficiency of the detector 6.) Average photocurrent c.) Root-mean-square (r.m.s) current fluctuations within the bandwidth given d.) Estimate the power gain of the amplifier stage in units of dB 60 50 40 Noise power (PW) 30 20 10 Electrical noise 0 0 5 10 15 20 Optical power (mW) Oscilloscope/ High intensity Spectrum analyzer beam i(t) PD Amplifier