The spectral response of the unfiltered SBC is illustrated in Figure 4.14. The peak photocathode response occurs at Lyman-. Its spectral response is defined by the cutoff of the MgF2 window at 1150 Å at short wavelengths, and by the relatively steep decline of the CsI photocathode at long wavelengths. Out-of-band QE at longer wavelengths (> 4000 Å) is < 10-8, yielding excellent solar-blind performance.
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