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.
Basic technical characteristics
|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|