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Photodiode Sensors convert incident laser photons into carriers (electrons and holes), which are afterwards measured as voltage or current. Being characterized by low noise and high sensitivity, photodiodes are suitable to detect very low light levels, making them ideal for low power measurements of CW lasers. Compared to thermal sensors, photodiodes have a limited spectral range of operation and a low saturation value (1mW/cm2 approximately), so it is often necessary to use attenuating filters when measuring relatively high powers. On the other end, photodiodes are the ideal choice for very low power measurements and when a fast response time is required.

Laser Point’s sensors are calibrated with traceability to NIST and PTB standards and are shipped with a Calibration Certificate. Laser Point’s series of photodiode can measure powers up to 500mW and can cover a wavelength range that extends from UV to the near IR.

They can be provided with DB15 connectivity or with USB and RS-232 connector.


Select Ordering Code without any option for DB15 head connectivity to Plus2 Meter;

Add connectivity option “U” to the Ordering Code for USB connectivity (PC-PLUG series);

Add option connectivity “R” to the Ordering Code for RS-232 connectivity (PC-PLUG series).

Ordering Code Power Range Detector Type Power Resolution Useful Aperture Spectral Range Cooling Connectivity
PD-50-D9-UV 10 µW – 50 mW Silicon 100 nW 9.5 mm 200 – 1100 nm Convection DB15
PD-50-D9-VIS 10 µW – 50 mW Silicon 100 nW 9.5 mm 400 – 1100 nm Convection DB15
PD-50-D9-IR 100 µW – 40 mW Germanium 1 µW 9.5 mm 800 – 1800 nm Convection DB15
PD-500-D9-VIS 100 µW – 500 mW Silicon 1 µW 9.5 mm 400 – 1100 nm Convection DB15