1979 International Conference on Submillimeter Waves and Their Applications · 1979 · 11 citations · 0 references
Photonic SensorShort Wavelength OpticVoltage ResponsivityEngineeringLaser ScienceLaser PhysicsLaser ApplicationsDetector PhysicsHigh-power LasersPhoton Drag DetectionOptical DiagnosticsLaser-based SensorInstrumentationPhotonicsMachine VisionPhysicsCommercially Available DetectorsPhoton DragPhoton StatisticOptical SensorsComputer VisionMotion DetectionApplied PhysicsTunable LasersDetector PhysicOptoelectronics
Although photon drag was first observed ten years ago [1] [2] detectors utilizing this effect have been largely confined to CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> laser wavelengths. Commercially available detectors are calibrated for 10.6 μm and although they can be used at other wavelengths various pitfalls can arise. Figure 1 shows the voltage responsivity of a typical p-type germanium detector between 2.5 and 13 μm. It is disconcerting to find that not only does the responsivity vary rapidly with wavelength, but the sign of the signal changes five times.