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around $1000 from Digikey. We'd have to measure its QE relative to NIST diode. Also now that I think about it we will want a temperature sensor on it as well, and measure QE vs. temperature at red edge of response curve. He's the claimed response curve :
(0.5 A/W at 600 nm is 100% QE)
Notes from meeting on 6/9/2023 with Chris and Chuck
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