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- Page 1 (217) 352-9330 | Click HERE Find the Newport 818-BB-30 at our website:...
- Page 2 NON-AMPLIFIED PHOTODETECTOR USER’S GUIDE Thank you for purchasing your Non-amplified Photodetector. This user’s guide will help answer any questions you may have regarding the safe use and optimal operation of your Non-amplified Photodetector. TABLE OF CONTENTS Non-amplified Photodetector Overview ......................1 II.
- Page 3 D. Connect the detector to the oscilloscope using a 50Ω coaxial cable that one meter or less. E. Use the 50Ω termination input of the oscilloscope. If the oscilloscope does not have a 50Ω input, connect the coaxial cable to a 50Ω terminator and connect this to the oscilloscope’s 1MΩ input. F.
- Page 4 Drawings: Non-amplified Photodetectors A. 818-BB-20, 818-BB-21 Dimensions: B. 818-BB-22, 818-BB-40 Dimensions: C. 818-BB-30, 818-BB-31 Dimensions: Page 3 of 6...
- Page 5 Specifications: Non-amplified Photodetectors A. Biased Silicon Photodetectors: 818-BB-20 818-BB-22 818-BB-21 818-BB-40 Part No. (Model) <350ps/<350ps <1.5ns/<1.5ns <300ps/<300ps <30ns/<30ns Rise Time/Fall Time Responsivity at 830nm 0.12mA/W 0.6A/W 0.47A/W 0.6A/W Power Supply (VDC) Spectral Range (nm) 350-1100 200-1100 350-1100 350-1100 Bandwidth >1.0GHz >200MHz...
- Page 6 Schematics: Non-amplified Photodetectors VII. Glossary of Terms Bandwidth: The range of frequencies from 0Hz (DC) to the frequency at which the amplitude decreases by 3dB. Bandwidth and rise time can be approximately related by the equation: Bandwidth ≈ 0.35/rise time for a Gaussian pulse input. Bias Voltage: The photodiode’s junction capacitance can be modified by applying a reverse voltage.
- Page 7 Decoupling Capacitor: Maintains bias voltage when fast pulses cause the battery voltage to reduce (this would slow the response time of the photodiode); the capacitor allows the battery to recover to its initial voltage. It also acts as a filter for external power supplies. Noise Equivalent Power (NEP): A function of responsivity and dark current and is the minimum optical power needed for an output signal to noise ratio of 1.
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