Abstract
Two classes of multichannel photodetectors in the vacuum ultraviolet (VUV) spectral zone are described and characterized. VUV radiation emitted from a laser-produced plasma source and was dispersed by a 1-m near normal incidence vacuum spectrograph was monitored by either channel electron multiplier array/intensified photodiode detector (CEMA/IPDA) combination, or un-gated backside illuminated charge coupled device (CCD) array. Results indicate that both dark current and readout noise of the CCD detector compare very favourably with corresponding values quoted by the manufacturer of the device. The spectrometric system with the CCD detector in place produced a FWHM of about 0.045nm in comparison with 0.1nm obtained with the CEMA/PDA combination. The resolving power (λ/Δλ) of the system has a value of about 1800 at 80nm approximately 2.25 times that obtained with the CEMA/PDA.
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