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DH_3_BI Bi-Alkali End-Window Photocathode (200-600nm)

  • DH_3_BI KCs bi-alkali detector 200-600nm
  • DH_3_BI KCs bi-alkali detector connectors

Housing a end-window bi-alkali (KCs photocathode) photomultiplier tube, a mu-metal shield and a PCB based dynode chain, reliable operation and excellent linearity can be ensured. The 415 high voltage supply module maintains the photocathode at a negative high voltage. The photocurrent generated by this detector is best measured using the 487 picoammeter or the 477 pre-amplifier followed by the 496 lock-in amplifier.

The mounting flange supplied with the DH_3_BI is compatible with the entire range of Bentham monochromators and accessories.

Core benefits


  • Housed photomultiplier tube featuring mu-metal shield and PCB dynode chain
  • Operated in either the DC or AC regimes
  • Compatible with Bentham's entire range of monochromators and accessories
  • Recommended for use with 400 series detection electronics


Active area20mm diameter
Window materialFused silica
Number dynodes10
Dynode chain resistanceLinear: 750 kΩ
Pulse Counting: 3.92 MΩ
Operating modePhotoemmisive
Spectral response range200-600nm
Peak wavelength (typ.)350nm
Dark current (typ.)50pA at 750V
NEP1 x 10-16 W.Hz-1/2
Max. high voltage2000V DC
Max. anode current100μA
Max. operating Temperature-30 to +60°C


CompatibilitySupplied with an interface plate, 4 x M3 clearance holes (Bentham slit pattern)

Ordering Information

DH_3_BIEnd-window bi-alkali photomultiplier detector

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