Scientifica Multiphoton Detection Unit (MDU)
Maximise your photon collection when performing multiphoton fluorescence imaging.
The MDU is an optimised one or two-channel fluorescence collection and detection system specifically designed for multiphoton imaging with small back aperture objectives.
High sensitivity is achieved, as the MDU is available with up to two gated or protected GaAsP photon multiplier tubes (PMTs) and is optimised for integration with Scientifica’s SliceScope microscope.
The MDU has everything you need, comprising of pre-aligned optics, safety shutters/switches, a filter cube and either one or two PMTs. Each detection unit also contains a power supply, preamplifier and control unit.
Increased photon capture
Maximised light collection from a wide range of objectives and condensers. Photons can be harvested from objectives that have either a small or large back apertures (RMS, M25, M27 and M32 thread adapters available).
Above or below the sample
Collect reflected fluorescence through the microscope objective, or transmitted fluorescence using a high-NA oil-immersion condenser lens. Alternatively, combine two MDUs simultaneously for optimum signal collection in up to four channels.
Achieve greater control
With gated GaAsP PMTs, you can have greater control when performing optogenetics experiments. This is because they enable the PMT to be desensitised for pulses of up to 10ms, whilst light stimulation is being applied. This not only optimises your experiments, but increases the lifetime of the PMT, by ensuring unreasonable levels of light are not damaging the amplification stages of the PMT.
Design & Specifications
|Number of channels||
Number of channelsTwo per MDU
Detector typesBi- and multialkali PMTs, protected and gated GaAsP PMTs
|Primary dichroic mirror||
Primary dichroic mirror665 nm long-pass dichroic
|Laser blocking filter||
Laser blocking filter680 nm short-pass filter
|Maximum objective exit aperture||
Maximum objective exit aperture24 mm diameter
Angular collectionCollects 5° of divergent light
Objective compatibilityWater-dipping M32X0.75, M27X0.75, M25X0.75 and RMS threaded types (direct or via adapters)
Spectral filtrationOne Olympus U-MF2 filter cube supplied (un-populated) compatible with standard fluorescence filter sets (25 mm filters and 24 x 36 mm dichroic mirrors, 1 mm thick)
Preamplifier bandwidth1 MHz for galvo detection, 20 MHz for resonant detection. Variable preamplifiers available for fine tuning of bandwidth and gain
Preamplifier gain200,000 (galvo detection), 100,000 (resonant detection)
Output connectionSMA (3.5 m signal leads supplied)
InputsBNC input for gate control on Gated GaAsP variant
The Journal of Physiology