Photodiode Power Sensor Selection Guide

Newport offers a complete line of optical meters and Photodiode Optical Power Sensors. Our sensor line is very flexible 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 suits your needs before selecting an optical meter.

Selecting a Low Power Sensor

See all of our standard model Low Power Sensors, or select a product series below to learn more. We also offer a complete line of Power and Energy Meters and Photodiode Sensor Accessories. Our low power sensors all include the following features:

  • Complete fiber optic and free space optic accessories available
  • Highest quality photodiodes are used
  • Low NEP (noise equivalent power) with wide dynamic ranges
  • EMI/RFI shield to minimize noise from environment
Model Series Features & Benefits
Newport Compatible Detectors
818-SL_DB 818 Low-Power Calibrated Photodiode Sensors
  • Industry standard models with broad customer base
  • Power levels from pW to 3 W via a matching OD3 attenuator
  • Both DB15 (/DB models) and 8-pin DIN (/CM models) calibration modules available, all detachable
PH-7308-S 918D Low-Power Calibrated Photodiode Sensors
  • Power levels from pW to 3 W with an integrated OD3 attenuator
  • Built-in thermistor for automatic thermal drift compensation
  • Built-in attenuator On/OFF sensor
  • Designed for lowest noise operation
  • DB15 calibration module only
818-ST2-UV Wand Style Calibrated Photodiode Sensors
  • Rugged aluminum housing with ergonomic design
  • Si and UV-enhanced Si detectors available (200 – 1100 nm)
  • Slim design with an integrated sliding OD3 attenuator
  • Both DB15 (/DB) and 8-pin DIN (/CM) cal modules all detachable
PH-818-IS-S Integrating Sphere Fiber Optic Sensors
  • Both photodiode and Integrating sphere designs available
  • 818-xx-L-FC/DB Series is new low cost fiber optic photodiode detectors
  • 818-IS-1 and 918D-IS Series utilize integrating spheres, enabling accurate and polarization independent measurements
  • Optical power input up to 200 mW
819D-SL-53-CAL Modular Integrating Sphere Sensors
  • 2", 3.3" and 5.3" sphere size available
  • Si or InGaAs detectors used
  • Measurements insensitive to exact detector positioning
  • Signal attenuation, advantageous in measurement of high-power beams
Oriel Detectors
NT-pg64a Flange Mount Photodiode Sensors
  • Large area models
  • Room temperature and cooled models
  • Models with spectral calibration
  • 1.5 Inch Series Flange Mount
BPT-pg6-81a TE Cooled HgCdZnTe Sensors
  • 10 Hz to 140 kHz bandwidth
  • Broad spectral range - 2.8 to 6 µm
  • Complete, packaged systems
Mode Repetition Rate Power Level Detector Family
CW N/A 11fW–2W(2) Low-Power Calibrated Photodiode Sensors
918D Series Low-Power Calibrated Photodiode Sensors
CW N/A 100pW–0.2W Fiber Optic Detectors
CW N/A 100 pW–4.5 W(4) Calibrated Integrating Sphere Sensors
CW N/A 1mW–400W Thermopile Laser Power Sensors, 10 - 500 W
Pulsed >10 Hz 1mW–400W (<0.6 J/cm2) Thermopile Laser Power Sensors, 10 - 500 W
Pulsed >100 Hz(1) 1pW–2W(2) (<1 µJ/cm2) Low-Power Calibrated Photodiode Sensors
918D Series Low-Power Calibrated Photodiode Sensors
Pulsed >100 Hz(1) 100pW–0.2W (>1 µJ) Fiber Optic Detectors
Pulsed >100 Hz(1) 100 pW–4.5 W(4) Calibrated Integrating Sphere Sensors

1) Power meter dependent. Minimum 1% duty cycle is recommended.
2) Maximum peak power density for OD3 attenuator that comes with the 818/918D Series detectors is 2W/cm2.
3) Upper power limit depends on several factors, e.g., sphere size, port aperture size and wavelength.
4) These detectors actually measure power, but the energy can be derived by the calculation, energy = power/(rep rate).

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.