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$$B=11.1\times\frac{mT}{A}\times I$$  $$Gain=G_{preamplifier}\times G_{filter}\times G_{lock-in-amplifier}\times G_{lowpass filter}=500\times2\times10\times1=10000$$  $$V_{Photodiode}=\frac{V_{output}\times1.11}{10000}$$  The main method is to change the magnetic field and then to observe the corresponding voltage output from photodiode.30mV, 40mV, 50mV and 60mV have been used to supply the magnetic field, and these are all rms values. Calculation method is shown above, and detailed numeric calculation is shown in the appendix.