C8991-05

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Product Specifications: Hamamatsu C8991-05

Category	Parameter	Specification / Description
General Information	Product Code	C8991-05
	Product Type	Solar-Blind Hybrid Photo-Detector (HPD)
	Variant Description	The `-05` suffix indicates a C8991 HPD with a specialized photocathode material and window, optimized for sensitivity in the deep ultraviolet (DUV) region while rejecting visible light.
Photocathode	Type	Solar-blind (e.g., Cs-Te, Cs-I)
	Form	Reflective (common for solar-blind cathodes)
	Effective Area	Diameter: 8 mm
	Window Material	MgF₂ (Magnesium Fluoride) or Synthetic Silica (To allow transmission of deep UV light, which is blocked by standard glass)
Spectral Response	Range	115 nm to 320 nm (Deep Ultraviolet)
	Peak Wavelength	~200 nm
	Key Feature	Extremely high rejection ratio for visible light (>10⁵). Only detects DUV radiation.
	Cathode Radiant Sensitivity	Typ. 20 mA/W (at 200 nm)
Semiconductor Target	Type	Avalanche Diode
	Operating Principle	Electron Bombardment Gain
Gain	Typical Value	2,000 to 10,000
	Excess Noise Factor, F	≈ 1.0 (Virtually noiseless gain)
Voltage	Operating Voltage (Cathode to Target)	-8 kV DC (Typical)
	Avalanche Diode Bias	+100 V to +200 V DC
	Polarity	Negative High Voltage on photocathode.
Performance	Dark Count Rate	Typ. 100 cps (at room temperature)
	Rise Time	1.5 ns (Extremely fast)
	TTS (Transit Time Spread)	150 ps (Excellent timing resolution)
	Magnetic Field Immunity	High.
Output	Signal	Anode Output
	Connector	BNC connector (standard)
Mechanical	Housing	Metal-bodied, head-on type.
	Window Material	MgF₂ (Critical for DUV transmission)
Applications		UV Flame Detection, Laser-Induced Breakdown Spectroscopy (LIBS), DUV Spectroscopy, Plasma Monitoring, Solar UV Monitoring, Corona Discharge Detection.