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General-Purpose Detectors and Receivers

General-Purpose Detectors and Receivers
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General-Purpose Detectors and Receivers - 3

With the extra-large 5- or 8-mm-diameter photodetectors in these photoreceivers, youՒll beable to tweak your experiment without worry- ing about the beam wandering off the photo-detector. Just position the photodetector close to where you think the laser beam is and youll see a signal. No more time-consuming andtedious alignmentprocedures. To keep your signal from going off scale while youҒre adjust-ing your experiment, youcan easily switchamong the three gain settings of 2 10 > 3 ,10 > 5 ,and 2 ח 10 > 6 V/A.These photoreceivers are battery powered soyoull need only a single coaxial cable...

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General-Purpose Detectors and Receivers - 7

Band-Pass Filters: independently adjustable high- and low-pass filters. This photoreceiver can often eliminate the need for lock-in detection. DC > 30 Setting allows you to monitor signals, even with large DC swings. Electrical Output: SMA electrical connector. The output impedance is 16 Ω ,and was designedto be used with 1-M Ω Variable Gain of Up to 90 dB in 10-dB Steps gives you a useful range from 1 pW to 10mW. oscilloscopes. Optical Input: photodiode located on the back. Optional FC fiber-optic versionsalso available. >

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General-Purpose Detectors and Receivers - 11

S V /).Unfortunately many high-frequency models do not. If the spectrum analyzer does not directly measure a spec- tral density, you will have to divide the spectrum by the square root of the noise-equivalent bandwidth of the measurement. The noise-equivalent bandwidth as a function of the resolution bandwidth is often specified in the spectrum-analyzers userҒs manual. The measured noise spectral density, > detectors Since laser intensity noise often sets the performancelimit of an experiment, it is important to characterize it to get good results. When making this kind of mea- surement, a...

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