During the last two decades there have been many significant developments with photodetectors, which have enabled high performance devices to exist throughout the visible and infrared regions of the spectrum, offering the possibilities of extreme sensitivities or lower cost medium performance sensors. With the development of the NEA photocathodes, photomultiplier tubes with much greater sensitivities and extended wavelength operation into the near infrared are readily available. Pyroelectric devices offer broad band detection and operate at room temperature. They are relatively cheap and have generally replaced other thermal devices for routine laboratory uses and are marketed in large quantities for surveillance systems. The major developments with solid state photon detectors have resulted in increased operating temperatures with the introduction of intrinsic devices for long wavelength applications which have replaced the extrinsic photoconductors, and the development of large two dimensional staring arrays.
KeywordsGaAs Acoustics PbTe PbSe
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