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Intensifier Generations<br />
1. Generation<br />
Image intensifiers without MCP<br />
2. Generation<br />
MCP image intensifiers with multi-alkali photocathodes<br />
3. Generation (Filmed)<br />
GaAs photocathodes on glass input windows<br />
Susceptible to ion damage<br />
⇒ ion barrier film (Al 2O 3) on MCP input<br />
⇒ 1) reduces effective QE by ≈ 1/4<br />
2) 800 V photocathode voltage (slower gating)
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