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OPTI 380A Prelab 2 - 2010-1

OPTI 380A Prelab 2 - 2010-1 - (SNR of 10 The data you need...

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OPTI 380A Lab 2: Detectors OPTI380A Prelab Questions 1. For an ideal silicon photodiode with unity efficiency, calculate the expected output current for incident wavelengths of 0.438 ! m and 0.91 ! m for input flux levels of 1 mW and 1 ! W. You should have a total of four answers for the different cases. 2. (a) If I were to use a Burle 931A photomultiplier tube with an anode-to-cathode bias of -800 V to detect He-Ne laser radiation at 633 nm, what would be the minimum laser power I could expect to observe with a signal-to-noise ratio
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Unformatted text preview: (SNR) of 10? The data you need for this calculation can be found in the data sheet on the class web site. (Hint: use Fig. 1 to get the responsitivity and Fig. 7 to get the noise current.) (b) A 931A photomultiplier is connected to a coax cable terminated with a 50 Ohm load for measurement of a continuous laser beam modulated at 100 MHz. The light level is such that there is a 0.5 volt signal on the scope. What is the SNR, assuming same conditions as 2(a)? Is the detector fast enough for the job?...
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