Advancing the UV/EUV
Measurement Science

Photodiode Selection

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AXUV Series

100% Internal Quantum Efficiency in the UV/EUV

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UVG Series

100% Internal Quantum Efficiency and Improved Stability in the UV

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SXUV Series

Hundred of gigarads of radiation hardness; no degradation on exposure to 100 eV photons

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International Radiation Detectors, Inc.

AXUV Photodiodes with Directly Deposited Filters

To avoid use of fragile freestanding thin filters during XUV experiments and also in space missions, visible blind AXUV photodiodes with integrated thin film filters have been developed. The table below lists available AXUV diodes with different filter materials and their passbands. Figures 1 and 2 plot a representative selection of quantum efficiencies for the filtered diodes in the VUV region. These filtered diodes exhibit visible light blocking of at least four orders of magnitude. Diodes with higher visible light blocking can be specially selected if required. IRD is continuously making AXUV diodes with many different filters. Users are requested to contact us for their special filter requirements.

The advantages of these integrated detector-filter devices over presently used separate freestanding thin foil filters and detectors are compactness, higher reliability, ease in manufacturing and handling, more stable bandpass and flexibility in design as the filter thicknesses are determined by optical constants and not by the mechanical strength requirement.

The filtered AXUV diodes have been successfully used in the SNOE and SOHO satellites by scientists at the National Center for Atmospheric Research and by scientists at University of Southern California respectively. They are also being used on the HBT-EP tokamak at Columbia University as detectors for the soft X-ray tomography system. We anticipate that these diodes will be extremely useful in future space missions and other applications like soft x-ray radiometry, x-ray lithography, x-ray microscopy and XUV spectroscopy.

Fig. 1: Quantum Efficiencies, various AXUV filtered diodes, 0 - 110 nm

Fig. 2: Quantum Efficiencies, various AXUV filtered diodes, 5 - 35 nm

Product Name	Filter Thickness	Pass Band
AXUV100Cr/W/Au	8/100/400 nm	< 1 nm
AXUV100Al/Fe *	400/450 nm	1.7-3.5 nm
AXUV100Al/Mn2 *	500/500 nm	1.9-3.5 nm
AXUV100Al/V *	400/600 nm	2.4-3.5 nm
AXUV100Ti/Zr/Al *	250/100/100 nm	2.8-5 nm
AXUV100Pb/Pd	50/100 nm	3-10 nm
AXUV100Al/CaF2/Ag*	200/1000/250 nm	3.6-5.2 nm
AXUV100Ti/Mo/Au	40/200/100 nm	5-12 nm
AXUV100Ti/Mo/C	50/200/70 nm	5-13 nm
AXUV100Ti/Mo/Si/C	40/200/100/50 nm	5-15 nm
AXUV100Ti/Zr/C	6/200/50 nm	6-16 nm
AXUV100Ti/Zr/Au #	20/200/100 nm	6-12 nm
AXUV100Ti/C #	500/50 nm	< 7 nm
AXUV100Ti/Pd #	200/100 nm	< 11 nm
AXUV100Si/Zr *	100/200 nm	11-18 nm
AXUV100Mo/Si	350/500 nm	12.2-15.8 nm
AXUV100Mo/Si₂	200/100 nm	12.2-15.8 nm
AXUV100Ti/C₂	200/50 nm	< 12 nm
AXUV100Al/Zr *	125/125 nm	17-21 nm
AXUV100Al	150 nm	17-80 nm
AXUV100Al₂	40 nm	17-80 nm
AXUV100GA1₂	50 nm	17-80 nm
AXUV100Al₃	100 nm	17-80 nm
AXUV100A₁₄*	1000 nm	17-80 nm
AXUV100A₁₅	300 nm	17-80 nm
AXUV100Al/C	200/50 nm	17-36 nm
AXUV100Al/Nb/C#	250/50/50 nm	17-21 nm
AXUV100Al/Mn#	200/100 nm	25-40 nm
AXUV100Al/Mn₃	270/100 nm	25-40 nm
AXUV100Cr/Al	60/150 nm	27-40 nm
AXUV100Cr/Al₂ #	100/200 nm	27-37 nm
AXUV100Cr/Al₃	100/270 nm	27-37 nm
AXUV100Sn: 2% Ge	200/10 nm	53-74 nm
AXUV100In/SiC	200/20 nm	76-105 nm
AXUV100In/MgF₂	200/20 nm	75-100 nm
AXUV100LA	200 nm	117-131 nm
AXUVSP2Al	150 nm	17-80 nm
AXUV96Al #	300 nm	17-80 nm
AXUV96Ti/Mo/C #	50/200/70 nm	5-13 nm
AXUV96Sn: 2% Ge	200/10 nm	53-74 nm
AXUV96In/SiC	200/20 nm	76-105 nm
AXUV20Ti/Mo/C	50/200/70 nm	5-13 nm
AXUV20Ti/Zr/C	6/200/50 nm	6-16 nm
AXUV20Ti/Mo/C	50/200/70 nm	5-13 nm
AXUV20Mo/Si	43.5/500 nm	12.2-15.8 nm
AXUV20Al	300 nm	17-80 nm
AXUV20Ti/C	200/50 nm	< 7 nm
AXUV20HS1Si/Zr	100/200 nm	11-18 nm
AXUV20HS1Al5	300 nm	17-80 nm
AXUV20HS1Mo/Si	350/500 nm	12.2-15.8 nm
AXUV20AMo/Si	350/500 nm	12.2-15.8 nm
AXUV20ASi/Zr	100/200 nm	11-18 nm
AXUV20BNC-Si/Zr	100/200 nm	11-18 nm
AXUV5ASi/Zr	100/200 nm	11-18 nm
AXUVHS5Si/Zr	100/200 nm	11-18 nm
AXUVHS5Mo/Si	350/500 nm	12.2-15.8 nm
AXUVHS5Al	200 nm	17-80 nm
AXUVHS5Al/C	200/50 nm	17-36 nm
AXUV300Al	150 nm	17-80 nm

Notes:	* Developed Specifically for the Filtered Diode Ross Spectrometer
	# Developed for the Solar Measurements

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