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.

  • Sensitive detectors for low power measurements
  • Visible, UV enhanced and NIR Detectors (200nm to 1800nm)
  • Fiber adapters available (SMA,ST, FC,LC,SC)
  • NIST and PTB (Physikalisch-Technische Bundesanstalt) traceability


Ordering CodePower RangeDetector TypePower ResolutionUseful ApertureSpectral RangeCoolingConnectivity
PD-50-D9-UV10 µW – 50 mWSilicon100 nW9.5 mm200 – 1100 nmConvectionDB15
PD-50-D9-VIS10 µW – 50 mWSilicon100 nW9.5 mm400 – 1100 nmConvectionDB15
PD-50-D9-IR100 µW – 40 mWGermanium1 µW9.5 mm800 – 1800 nmConvectionDB15
PD-500-D9-VIS100 µW – 500 mWSilicon1 µW9.5 mm400 – 1100 nmConvectionDB15


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