Single Detectors

Photomultiplier based Single Photon Counting Modules

ALV-Single Photon Detector Products based on photomultiplier tubes are perfectly suited for the use in SLS&DLS and DWS experiments. Generally, single photomultipliers ensure optimum performance in all such experiments that can be performed with a low to medium quantum efficiency detector, thus are not severely “photon limited”, and do not require the accumulation of correlation function information in the sub-µs lag time regime. If sub-µs lag time regime shall be accessed, Use cross correlation or “pseudo” cross correlation detectors instead. In detail, all photomultiplier based ALV-Single Photon Detectors offer the following common characteristics :

Light-In, Pulse-Out Techology, besides attaching the light input and the power / signal cable, no user adjustments are required
Light input for fiber optics cable
DC-coupled preamplifier / discriminator, high gain and bandwidth
High pulse pair resolution
Wide range photocathode from blue wavelength to red wavelength
Low dark counts, typ. below 250 cps, low afterpulsing
Very low thermal drift, not susceptible to environmental temperature changes
Overload protection (ALV/SO-SIPD-II)

Avalanche Photo Diode based Single Photon Counting Modules

ALV-Single Photon Detector Products based on APDs tubes are perfectly suited for the use in SLS&DLS, DWS and specially FCS experiments. Generally, single APDs ensure optimum performance in all such experiments that require medium to high quantum efficiency detector, thus are “photon limited”, such as FCS, for example. As with PMTs, the accumulation of correlation function information in the sub-µs lag time regime is not recommended using a single detector. Use cross correlation or “pseudo” cross correlation detectors instead. In detail, all APD based ALV-Single Photon Detectors offer the following common characteristics :

Light-In, Pulse-Out Techology, besides attaching the light input and the power / signal cable, no user adjustments are required
Light input for fiber optics cable
High linearity and low afterpulsing ensured by special selection procedure
Wide range optical sensitivity from blue wavelength to near IR wavelength
Low dark counts, typ. below 250 cps, low afterpulsing
Very low thermal drift, not susceptible to environmental temperature changes
ALV developed Overload Protection Unit

ALV Single Detector Photon Counting Modules

	ALV-SIPC	ALV-SIPC-II	ALV-High Q.E. APD
Max. Counting Frequency	17 MHz	17 MHz overload protection @ 6 MHz sustained	15 MHz overload protection @ 8/12,5 MHz sustained
Dark Counts	< 250 cps, typ. 200 cps	< 250 cps, typ. 200 cps	< 250 cps, typ 200 cps
Pulse Width Dead Time	< 25 ns < 40 ns	< 15 ns < 40 ns	< 25 ns 50 ... 60 ns

Q.E. at 633 nm	3.5% max., typ. 3%	9% max., typ. 8%	70% max., typ. 65%
Q.E. at 532 nm	9% max., typ 8%	8% max., typ. 7%	52% max., typ. 50%
Q.E. at 488 nm	13% max., typ. 12%	7.5% max., typ. 6.5%	45% max., typ. 40%
Wavelength range (min. 1% Q.E.)	200 nm ... 700 nm	200 nm ... 810 nm	320 nm ... 1080 nm

	5 V, 200 mA	5 V, 200 mA	5 V, 1.6 A peak
Light Input	FC-type connector	SMA- or FC-type connector	FC-type connector
Pulse Output	TTL @ 50 Ohm	TTL @ 50 Ohm	LTTL @ 50 Ohm
Power Requirement	5 V, 200 mA Power Supply is part of delivery (95 ... 265 VAC)	5 V, 100 mA Power Supply is part of delivery (95 ... 265 VAC)	5V, 1 A (1.6 A peak) Power Supply is part of delivery (95 ... 265 VAC)

ALV reserves the right to sell the ALV-SIPC, the ALV-SIPC-II and the ALV-High Q.E. APD only for use with ALV-Correlators. These products must thus either be ordered in a package with an ALV-Correlator or ordered by an existing ALV-Correlator User for use with his/her ALV-Correlator.

Please inquire for special package prices !