Features

• Two Spectral Ranges Available: 280 - 630 nm or 280 - 850 nm
• Head-On Photomultiplier Tube Configuration
• Electrostatic and Magnetic Shielding
• Conversion Gain: 1 V/μA of Anode Current
• Circular Dynode Chain Configuration
• Housing Equipped with SM1 Threads
• Housing has Four Threaded Holes for ER Series Cage Rods
• Post-Mountable in Three Different Configurations
• 120 V Power Supply (230 V on -EC Version)
• SMA Output

Thorlabs offers two photomultiplier modules that combine a head-on photomultiplier tube (PMT) with a housing and a high-gain, DC-coupled, transimpedance amplifier: PMM01 for the 280 - 630 nm spectral range and PMM02 for the 280 - 850 nm spectral range. The PMM01 features a semitransparent bialkali photocathode and offers a higher gain, higher quantum efficiency for λ< 500 nm, and lower dark current than the PMM02, but it is useful over a smaller spectral range. Bialkali photocathodes are widely used for scintillation light detection since their sensitivity is well matched to the most common scintillator materials. In contrast, the PMM02 features a semitransparent multialkali (type S20) photocathode and offers a higher quantum efficiency for λ> 500 nm and wider spectral range than its counterpart. Multialikali photocathodes are commonly used for broadband spectrophotometers and photon counting applications.

Both modules are equipped with three #8-32 taps to enable post mounting in various orientations. In addition, there are four tapped #4-40 holes on the front face of the module, making these modules compatible with our 30 mm cage systems. These items are shipped with a protective cover over the PMT aperture. Once the cover is removed, the module has an internal SM1-compatible bore, making it compatible with our line of SM1 lens tubes. Therefore, imaging optics and filters can be easily mounted and centered on the photocathode of the PMT. Furthermore, by using lens tubes, stray and scattered light can be prevented from reaching the detector, which is particularly advantageous when working with weak or noisy signals.