Photodiode Power Sensor Selection Guide

Newport offers a complete line of optical meters and Photodiode Optical Power Sensors. Our sensor line is very adaptable and can be used to measure power and energy with both free-space and fiber optic inputs. The following tables, in combination with the Detector Performance Charts, should help identify the optical meter/detector combination appropriate for your particular optical measurement needs. It is always a good idea to select a detector that meets your requirements before selecting an optical meter.

Photodiode Optical Power Sensor Families

Our Calibrated Photodiode Power Sensors are available in many form factors, including integrating sphere photodiode sensors, and are NIST-traceable calibrated for use with Newport's complete line of optical power meters. To complete your detection system, Newport also provides a comprehensive set of photodiode sensor accessories including attenuators, fiber-optic adapters, optic adapters and mounting bases. All of Newport's photodiode sensors include the following features:

  • Highest quality photodiodes
  • Low NEP (noise equivalent power) with wide dynamic ranges
  • EMI/RFI shield to minimize noise from environment

Also available from Newport are Oriel sensors for spectroscopy.

Listed below is a summary of Newport's photodiode power sensor product families.

Free Space Photodiode Power Sensors

Fiber-Optic Photodiode Power Sensors

Integrating Sphere Photodiode Power Sensors

Oriel Sensors for Spectroscopy

Laser Operation Modes and Power Levels

Optical sensors can perform differently depending on the input beam. This table summarizes the recommended sensor families according to laser operation modes and power levels. Note that the sensors measure power, but energy can be derived by the calculation: energy = power / rep rate.

Detector Family Mode Repetition Rate Power Level
818 Photodiode Sensors with Threaded OD3 Attenuator
918D Photodiode Sensors with Attenuator Switch
CW N/A 11fW–2W
Pulsed 100 Hz(1) 1pW–2W (<1 µJ/cm2)
818 Fiber-Optic Photodiode Power Sensors
918D-IS Fiber-Optic Integrating Sphere Sensors
ILX Precision Fiber Optic Measurement Heads
CW N/A 100pW–0.2W
Pulsed 100 Hz(1) 100pW–0.2W (>1 µJ)
819C Collimated Beam Integrating Sphere Sensors
819D Diverging Beam Integrating Sphere Sensors
CW N/A 100 pW–4.5 W(2)
Pulsed 100 Hz(1) 100 pW–4.5 W(2)
919P Thermopile Laser Power Sensors, 10 - 500 W CW N/A 1mW–400W
Pulsed 10 Hz 1mW–400W (<0.6 J/cm2)

(1) Power meter dependent. Minimum 1% duty cycle is recommended.
(2) Upper power limit depends on several factors, e.g., sphere size, port aperture size and wavelength.

Detector Performance Charts

Detector Range Cht-S

Note: The gradient shaded regions of the detector power and energy operating ranges reflect the dependence of the measurement noise floor on the amplifying electronics used with the detector. Newport's optical meters are designed to minimize the noise floor.