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Ge-CAL Spectral Responsivity Standard (800-1800nm)

  • Ge-CAL Spectral Responsivity reference Standard 800-1800nm

Calibrated in our dedicated laboratory, in short-circuit conditions, with respect to standards calibrated by the Physicalish Technische Bundesanstalt (PTB, Germany) a calibration range of 800-1800nm is on offer.

Housing a 5mm diameter active area germanium photodiode (800-1800nm), the Ge-CAL delivers enhanced linearity and exceptionally low noise. Operated in the photovoltaic mode, the photocurrent generated by this detector is best measured in using a trans-impedance amplifier such as that of the Bentham 487 or 477.

Core benefits


  • Spectral responsivity standard, 800-1800nm (A.W-1)
  • Germanium photodiode 
  • High sensitivity 5mm diameter active area
  • Calibration performed with respect to the Physicalish Technische Bundesanstalt (PTB, Germany)
  • Compatible with the entire range of Bentham monochromators and accessories
  • Recommended for use with the 400 Series of detection electronics


Active area5mm diameter
Spectral response range800-1800nm
Operating modePhotovoltaic
Dark Current (typ.)<1pA
Shunt Resistance (typ.)15kΩ
Peak Wavelength (typ.)1500nm
Peak Responsivity (typ.)0.90 A.W-1
NEP1.5 x 10-12 W.H-1/2
Maximum Operating Temperature-20 to +60°C


Measurement TypeShort-circuit spectral responsivity
Wavelength Range800-1800nm
Wavelength Interval5nm
Temperature at calibration20°C
TraceabilityPhysicalish Technische Bundesanstalt (PTB, Germany)
Calibration FrequencyThree yearly recommended


Compatibility4 x M3 clearance holes in Bentham slit pattern
Dimensions80L x 50W x 42H (mm)


CALIBRATION-DH-GE-5Spectral responsivity calibration 800-1800nm

Ordering Information

DH_GE_5Ge-CAL Spectral Responsivity Standard
CALIBRATION-DH-GE-5Spectral responsivity calibration 800-1800nm

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