Ch7Sec2 - THE FIBER FORUM Fiber Optic Communications...

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THE FIBER FORUM Fiber Optic Communications JOSEPH C. PALAIS PRESENTED BY
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Joseph C. Palais 7.2 2 Section 7.2 Vacuum Photodiode And Photomultiplier Vacuum Photodiode v hf Electrons Cathode Anode + i R L V - - +
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Joseph C. Palais 7.2 3 VACUUM PHOTODIODE AND PHOTOMULTIPLIER The work function φ is defined to be: Energy required to liberate an electron from the metal cathode. Units of energy: Joules In order to free an electron: the photon energy must equal, or exceed, the work function.
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Joseph C. Palais 7.2 4 VACUUM PHOTODIODE AND PHOTOMULTIPLIER φ λ hc (7.3) hf hc Thus, the incoming photon frequency must satisfy:
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Joseph C. Palais 7.2 5 VACUUM PHOTODIODE AND PHOTOMULTIPLIER The longest wavelength that can be detected is called the cutoff wavelength . It is given by: φ λ 24 . 1 (7.4) where λ c is in μ m, and φ in eV. For detection we require: hc c = or 24 . 1 = c
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Joseph C. Palais 7.2 6 VACUUM PHOTODIODE AND PHOTOMULTIPLIER Current flows through the load resistor R
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Ch7Sec2 - THE FIBER FORUM Fiber Optic Communications...

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