Optical Immersion of the <strong>Detectors</strong>Optical immersion of infrared detectors to high refractionmicrolenses is used to improve performance of the devices butmay limit acceptance angle. Action and properties ofhemispheric and hyperhemispheric lenses are illustrated in thedrawings and tables below.hemispherical lensacceptanceangle Φobjectiveacceptanceangle ΦobjectiveR=Ld – optical (apparent) detector sized' – physical detector sizeR – lens radiusL – lens face to objective focal plane distanceobjectivefocal planed'dhyperhemisphericallensobjectivefocal planeRLd'dApplicationsThe typical applications of the VIGO <strong>System</strong> S.A. detectorsare given in the table below. Please, provide detailed systemrequirements – we will recommend optimum solution.Table 2. ApplicationsApplicationsDetector Series - examplesSpectroscopyPCI-2TE, PVI-nTE, PVI, PCIGas AnalysisPCI-2TE, PVI-nTE, PVI, PCILaser MetrologyPV, PV-2TE, PVM, PVM-2TE,PEM, PEMIHigh Speed OperationPVI-nTE, PVI, PVM, PVMI,PEM, PEMIAnalysis of Spatial and TimeDistribution of Laser BeamPV, PV-nTE, PVM, PVM-nTERemote TemperatureMeasurementsPV-nTE, PVI-nTE, PVI-nTE,PCI, PCI-nTEHeterodyne DetectionPV-2TE, PVI-nTE, PCI,PCI-nTEBiomedical applicationsPV, PVI-nTE, PVM, PVMI,PEM, PEMIPyrometers, ScannersPV-2TE, PVI-nTE, PCI,Thermal ImagersFree Space OpticalCommunicationLIDARDetection and Monitoring ofThermal ObjectsLaser-Matter InteractionStudiesLaser Threat WarningFire, Flame and Human BodyDetectionPositioning <strong>System</strong>sTracking <strong>System</strong>sNondestructive MaterialTestingPCI-nTEPV-2TE, PVI-nTE, PCI,PCI-nTEPVI-nTE, PVIPVI-nTE, PCI-nTEPV-2TE, PVI-nTE PCI,PCI-nTEPV, PV-2TE, PVM, PVM-2TE,PEM, PEMIMPC, PCI, PVI, PVMIPV-2TE, PVI-nTE, PCI,PCI-nTEPV, PV-2TEPV, PV-2TE, PC, PCI,PCI-2TE, PC-2TEAll DevicesTable 1. Immersed device parametersParameter Hemisphere HyperhemisphereTheory GaAs Theory GaAsDistance, L R R R(n + 1) 4.3Rd/d' n 3.3 n 2 10.9D* imm /D* nonimm n 3.3 n 2 10.9Acceptance angle, Φ 180˚ 180˚ 2 arcsin(1/n) 35F/# 0.5 0.5 n/2 1.62Where n is the index of refraction (~3.3 for GaAs)The values in table 1 show the relative change of a givenparameter comparing to a non-immersed detector of the sameoptical size.<strong>Detectors</strong> with custom acceptance angles are available onrequest.Immersion technology is described in “Infrared <strong>Detectors</strong> and<strong>System</strong>s”, E.L. Dereniak and G.D. Boreman, WileyInterscience 2000.A.P. 25.09.2010Infrared <strong>Detectors</strong> <strong>from</strong> VIGO <strong>System</strong> S.A.
Custom Engineering25 years of experience in infrared technology has given usopportunity to provide the extensive custom engineeringcapabilities. Our Custom Engineering staff is ready for closecooperation with our partners at any stage of the developmentprocess to select the best solutions.Our manufacturing technologies are very flexible, therefore inaddition to our catalog products, we could offer optimizeddevices for particular applications- various detector areas andformats, spectral and frequency response, temperature ofoperation, field of view, packages, connectors and othercharacteristics. Custom detector formats available at present areshaped single element detectors, linear and bilinear arrays,small 2-D arrays (e.g. quadrants).Even more flexible are integrated optics /detector/electronicspackages, fabricated for general use and OEM applications.They may include objectives, optical filters, detectors, variouspreamplifiers, detector bias circuits, A/D converters, Peltiercoolers, cooler controllers, heat dissipation and othercomponents.Quadrant Detector in a Specialised PackageStandard PackagesMultielement Linear ArrayEpitaxial Production <strong>System</strong>A.P. 25.09.2010Infrared <strong>Detectors</strong> <strong>from</strong> VIGO <strong>System</strong> S.A.