Topaz-M MCP-PMT with a built-in voltage divider is designed for the detection and amplification of optical signals in the visible light spectrum and provides operation in photon counting mode.
PMT vacuum unit has a bialkali antimony-potassium-sodium photocathode, a chevron stack of two MCPs and a metal anode. Its construction parts form an immersion lens that focuses photoelectrons to the first MCP input. A resistive voltage divider is mounted on the vacuum unit, providing the necessary PMT electrode potentials. The entire device is housed and sealed with a compound. Attached to the output end of the envelope is a 50-Ohm SMA output connector and a high voltage SHV connector for the power supply.
Specification
Basic technical characteristics
| Parameter, unit | Value |
|---|---|
| Spectral response range, nm | 300–650 |
| Integral sensitivity, μA/lm | 35, min |
| Photocathode active area diameter, mm | 17 |
| Gain at MCP voltage of 3300 V max | 106, min |
| Single electron pulse height resolution, % | 110, max |
| Peak-to-valley ratio | 10, min |
| Dark count rate density (at 25°C), counts/sec·cm2 | 40, max |
| Response pulse duration (FWHM), ns | 1.2 max |
| Anode current pulse rise time, ns | 0.8 max |