OPTI 380A Lab 3 Detectors - Procedures 2010-2

OPTI 380A Lab 3 Detectors - Procedures 2010-2 - Revision...

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Revision 9/2/2010 Optics 380A Detectors 1 OPTICS 380A DETECTORS Introduction This lab deals with a variety of photo detectors. A photo detector converts optical energy into observable signal and is used in numerous scientific and technical applications. There are two general categories of photo detectors: thermal and photoelectric. Thermal detectors convert light energy into heat energy and are generally slow and inefficient. Photoelectric detectors convert light into current. In this lab you will be familiarized with four types of detectors: photomultiplier, photodiode (p-n junction), photoconductor and pyroelectric detector. Some of the important parameters of photo detectors are (1) quantum efficiency, probability of generating a pair of photo carriers by a single photon, (2) responsivity, relation between the electric current and optical power, and (3) response time. All parameters depend on the wavelength of incident light and on the amount of power. All detectors have a finite dynamic range which is defined by their minimal detectable power and saturation power. The signal output of photo detectors is current. The current signal is usually converted to voltage signal using a transimpedance amplifier. A transimpedance amplifier is an op-amp with a feedback resistor, and you can think of it as a circuit that converts current to voltage. For this lab, you need to answer all the questions in section A to D, including the plots. A. THE PHOTOMULTIPLIER TUBE (PMT) 1. Read the data sheets for the Burle 931A PMT and its power supply PF1042. Connect the PMT to the 12 volt main power supply and program it for –1000V with a programming power supply voltage of 8V or programming resistance of 2 k ! . Connect the output of the PMT to a transimpedance amplifier and measure the voltage output with an oscilloscope (Channel 1). 2.
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OPTI 380A Lab 3 Detectors - Procedures 2010-2 - Revision...

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