Features

• Head-On Photomultiplier Tube for 280 - 630 nm
• Electrostatic and Magnetic Shielding
• Circular Dynode Chain Configuration
• Housing Equipped with SM1 (1.035"-40) Threads
• Housing has Four Threaded Holes for ER Series Cage Rods
• Post-Mountable in Three Different Configurations
• Power Supply with 120 and 230 V Plug Adapters Included
• SMA Output
• No High Voltage Power Supply Needed
• Tube Control Voltage Requires Variable (0 - 1.25 VDC) Supply (Not Included)

This head-on Photomultiplier Tube (PMT) includes a housing and a high-gain, DC-coupled, transimpedance amplifier The PMM01 features a semitransparent bialkali photocathode for 280 - 630 nm, and offers higher gain, higher quantum efficiency for λ< 500 nm, and lower dark current than multialkali PMTs. Bialkali photocathodes are widely used for scintillation light detection since their sensitivity is well matched to the most common scintillator materials.

Thorlabs' PMT module features built-in HV circuity, eliminating the need for the external HV power supplies typically required for PMT operation. By incorporating the HV circuity within the PMT module, Thorlabs' PMT reduces costs, device footprint, and risk of electrical shock. The PMT module is powered by a ±12 VDC power supply (included with 120 V and 230 V plug adapters). The tube control voltage is provided by a variable 0 - 1.25 VDC power supply, which is not included.

The PMT is equipped with three 8-32 taps to enable post mounting in various orientations. One AS4M8E (8-32 to M4) adapter is included for metric compatibility. 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. This item is shipped with a protective cover over the PMT aperture. Once the cover is removed, the module has an internal SM1 (1.035"-40) threaded 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.

Specifications

• Photocathode Type: Bialkali
• Photocathode Geometry: Head-On
• Dynode Chain Orientation: Circular
• Photocathode Active Diameter: 22 mm
• Wavelength Range: 280 - 630 nm
• Gain (Max): 7.1 x 10⁶
• Peak Responsivity (Max): 86 mA/W
• Quantum Efficienty at Peak (Typical): 28% at 400 nm
• Transimpediance Gain:
• Hi-Z: 1 x 106 V/A
• 50 Ohms: 5 x 105 V/A
• Dark Current (@ 20°C): 0.3-3 nA
• Dark Count Rate (@ 20°C): 100 s^-1
• Bandwidth (6 dB)^a: 0-20 kHz
• Amplifier Noise (Typ.): 2 mV RMS
• Amplifier Offset (Typ.): 1 mV
• Output Rise and Fall Time: 15 µs
• Output Impedance: 50 Ohms
• Output Signal^b:
• 0-10 V (unterminated)
• 0-5 V (terminated into 50 Ohms)
• Power Input:
• +12 V (+12 to +15): 40 mA
• -12 V (-12 to -15): 10 mA
• Anode Current (Max): 100 µA
• Tube Voltage (Anode to Cathode)^c: 0 to -1250 V
• Tube Voltage Control^d: 0 to 1.25 V
• HV Control Sensitivity: -1000 V/V
• Warm Up Time: <10 s
• Output Connector: SMA
• Module Dimensions: 3.66" x 1.6" x 2.46", (92.9 mm x 40.6 mm x 62.5 mm)
• Operating Temperature: 5 to 55°C
• Storage Temperature: -40 to 55°C
• Mounting Holes: 8-32 (M4 on -EC version)
• Weight (Power Supply): 1.1 kg (2.42 lbs)
• Weight (PMT): 0.2 kg (0.5 lbs)
• Window Characteristics
  • Material: Borosilicate
  • Type: Plano-Concave
  • Refractive Index: 1.49
  • Potassium (K): 300 ppm
  • Thorium (Th): 250 ppm
  • Uranium (U): 100 ppm

^a The bandwidth decreases with increased output signal levels
^b The output signal should be below the maximum output voltage to avoid saturation. Use ND filters if necessary.
^c If maximum anode current is exceeded, the PMT will be destroyed.
^d Tube Voltage (from cathode to anode across dynode chain) = -1000 x Tube Voltage Control, Variable (0 - 1.25 VDC, <1 mA).Tube control power supply not included.