! NEW ! : The ALV-CorrTector-II

Combining an Avalanche Photo Diode with an ALV-7004/USB Correlator

A break-trough product combining a super-high count rate linearity, ALV-developed Avalanche Photo Diode detector with an enhanced ALV-7004/USB Multiple Tau Digital Correlator in a single housing. Maximum light count rates of more than 80 Mcps, lowest afterpulsing and dark counts combined with an additional afterpulsing correction scheme makes this detector/correlator combination  the ideal choice for DLS/SLS and DWS experiments, even rivalling ‘pseudo-cross correlation’ setups in terms of sub-µs lag time access. Small outlined, light-weighted and with remarkably small power consumption, it offers the most easy way to set-up one of the above mentioned experiments featuring ‘Light in - Correlation Function out’ technology at it’s best.

Furthermore, the specific way the APD is operated ensures inherently safe handling even in strongest and sustaining light overexposure conditions, without the need of restricting or modulating the APD detector output by invoking temporary
sub-Geiger modes.

Active, TEC based thermal control ensuring highest dark count stability.

Download the data sheet and technical description of this breathtaking product here.

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 and APD/Correlator Combinations

ALV reserves the right to sell 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 !
 

! Discontinuation Notice !

Photomultiplier based Single Photon Counting Modules

Due to the continued trend towards semiconductor based single photon detectors in favour of photomultiplier tubes and/or channeltron based single photon detectors, ALV discontinues the development and sales of photomultiplier/channeltron based single photon detectors from 01.10.2012. This decision is a direct consequence of all ALV’s so far suppliers of photomultiplier tubes and/or channeltrons strictly reducing their product portfolio, leading to practically all tubes/channeltrons ALV used for the ALV single photon detectors in the past to become obsolete. In addition, the tremendous advance in the performance of semiconductor based single photon detectors over the last years renders further development or redesign based on photomultipliers/channeltrons difficult to motivate. In turn, new developments of ALV single photon detectors will as well be based solely on semiconductor detectors, primarily silicon avalanche photo diodes.

Warranty and repair services for existing photomultiplier/channeltron based products will be continued for the warranty period whenever applicable and, depending on repair part availability, for ALV single photon detectors already out of warranty until further notice, but not longer than until 31.12.2013.