Review of Scientific Instruments · 1999 · 28 citations · 10 references
EngineeringElectrical EngineeringPhysicsOpticsOptoelectronicsRadiation DetectionDetector TechnologyPhotodetectorsRadiation DetectorsX-ray DetectionX-ray DetectorsX-ray OpticsDiamond DetectorsPhotoconductive DetectorsPhotodiodesResponse TimeSaturationSoft X-ray OpticsSolid-state X-ray DetectorsX-ray Optics Testing
A 1-mm-square diamond photoconductive detector (PCD) has been installed on the LLNL Nova laser system, for use as a broadband soft x-ray power diagnostic. The PCD is installed behind an array of pinholes, which cast multiple, overlapping images of the source onto the diamond. This allows reduction of the x-ray intensity, to avoid saturation problems, while avoiding the spectral dependency of thin film filters. The diode current is read out on a 5 GHz bandwidth scope. The system is calibrated by comparison to an absolutely calibrated array of filtered vacuum x-ray photodiodes (“dante”). The time response of the PCD and its bias electronics have been characterized using the 5th harmonic (210 nm) of a short pulse (<1 ps) Ti: sapphire laser. The data show a fast rise, limited by the 5 GHz scope bandwidth, and a slower fall off, characterized by an RC time of order 200 ps.
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Carrier density dependent photoconductivity in diamond
Lina Pan, D. R. Kania, P. Pianetta et al. · Applied Physics Letters · 1990 · 79 citations