Compare Model Drawings, CAD & Specs Sensor Size Spectral Range Maximum Measurable Power1 Maximum Measurable Power Without Attenuator Availability Price
918d calibrated photo diode power sensor
$1,461
In Stock
Ø3 mm 800 - 1650 nm 100 mW (1830-R, 1918-R, 1936-R/2936-R), 13 mW (843-R, 1919-R, 841-PE-USB) 10 mW (1830-R, 1918-R, 1936-R/2936-R), 1.3 mW (843-R, 1919-R, 841-PE-USB)
In Stock
918d calibrated photo diode power sensor
$1,420
In Stock
Ø3 mm 800 - 1650 nm 1.0 W (1830-R, 1918-R, 1936-R/2936-R), 130 mW (843-R, 1919-R, 841-PE-USB) 10 mW (1830-R, 1918-R, 1936-R/2936-R), 1.3 mW (843-R, 1919-R, 841-PE-USB)
In Stock
918d calibrated photo diode power sensor
$1,227
In Stock
Ø3 mm 800 - 1650 nm 2.0 W (1830-R, 1918-R, 1936-R/2936-R), 1.3 W (843-R, 1919-R, 841-PE-USB) 10 mW (1830-R, 1918-R, 1936-R/2936-R), 1.3 mW (843-R, 1919-R, 841-PE-USB)
In Stock
918d calibrated photo diode power sensor
$832
In Stock
Ø3 mm 780 - 1800 nm 100 mW (1830-R, 1918-R, 1936-R/2936-R), 13 mW (843-R, 1919-R, 841-PE-USB) 10 mW (1830-R, 1918-R, 1936-R/2936-R), 1.3 mW (843-R, 1919-R, 841-PE-USB)
In Stock
918d calibrated photo diode power sensor
$899
In Stock
Ø3 mm 780 - 1800 nm 1.0 W (1830-R, 1918-R, 1936-R/2936-R), 130 mW (843-R, 1919-R, 841-PE-USB) 10 mW (1830-R, 1918-R, 1936-R/2936-R), 1.3 mW (843-R, 1919-R, 841-PE-USB)
In Stock
918d calibrated photo diode power sensor
$753
In Stock
Ø3 mm 780 - 1800 nm 2.0 W (1830-R, 1918-R, 1936-R/2936-R), 1.3 W (843-R, 1919-R, 841-PE-USB) 10 mW (1830-R, 1918-R, 1936-R/2936-R), 1.3 mW (843-R, 1919-R, 841-PE-USB)
In Stock
918d calibrated photo diode power sensor
$705
In Stock
Ø11.3 mm 400 - 1100 nm 40 mW with 1830-R and 1936-R, 25 mW with 843-R, 1919-R, and 841-PE-USB 4 mW with 1830-R and 1936-R, 2.5 mW with 843-R, 1919-R, and 841-PE-USB
In Stock
918d calibrated photo diode power sensor
$763
In Stock
Ø11.3 mm 400 - 1100 nm 400 mW with 1830-R and 1936-R, 250 mW with 843-R, 1919-R, and 841-PE-USB 4 mW with 1830-R and 1936-R, 2.5 mW with 843-R, 1919-R, and 841-PE-USB
In Stock
918d calibrated photo diode power sensor
$645
In Stock
Ø11.3 mm 400 - 1100 nm 2.0 W 4 mW (1830-R, 1918-R and 1936-R), 2.5 mW (843-R, 1919-R, and 841-PE-USB)
In Stock
918d calibrated photo diode power sensor
$791
In Stock
Ø11.3 mm 200 - 1100 nm 0.2 W (200-400 nm); 50 mW (400-1100 nm) 0.3 mW (200 - 400 nm); 0.1 mW (400 - 600 nm, >1050 nm) , 0.07 mW (600 - 1050 nm)
In Stock

Features

Highest Quality Photodiodes

Plots of various photodiode characteristics

Newport uses the highest quality semiconductor detector materials available. Available sensor types are silicon (Si), UV-enhanced Si, Germanium, and Indium Gallium Arsenide (InGaAs). Choose 918D-UV-OD3R for 200 - 400 nm wavelength, but note that the maximum measurable power level in 400 - 1100 nm is as low as 50 mW with the attenuator on. Newport’s advanced in-house calibration facility performs the tightest calibrations in the business, further improving the absolute accuracy of our detectors.

Enhanced Features

The 918D Series Photodiode Sensors are designed to outperform Newport's industry proven 818 Series Calibrated Photodiode Sensors, by enhancing their performance with advanced features, when connected to certain power meter models. These features are:

  • A built-in attenuation filter with no worries about misplacing it
  • Various detector models with different attenuation factors - OD1, OD2, and OD3 (except for the UV model)
  • An electronic attenuator On/Off position sensor so that the power meter automatically switches the setting
  • A temperature sensor to compensate for temperature dependent responsivity change.  

Wide Dynamic Range with Built-in Attenuator

Exclusive OD3 attenuator technology extends the calibrated optical dynamic range of our detectors by three decades. Our attenuator design provides high damage threshold and spectral flatness. With the low NEP associated with the photodiodes Newport is using, a wider dynamic range is achieved. For less than 1 mW input power, we recommend to put the attenuator to OFF position (0.1 mW for 918D-UV-OD3R between 200 - 400 nm) to maximize the signal to noise ratio. The clear aperture of this attenuator is 10.3 mm.

Typical spectral responsivity of Newport's low power detectors

Tightest Calibration Uncertainty

The 918D Series include a full spectral response calibration utilizing NIST-traceable standards calibrated with high-precision equipment maintained in Newport’s optical detector calibration facility. Tight calibration facility and process control allows the tightest calibration uncertainty in industry. Each detector is shipped with the calibration data, which is electronically stored inside the detector's EEPROM. A certificate of calibration as well as the actual calibration curves and data are shipped with each detector for attenuator and no attenuator modes. To maintain accuracy and guarantee performance Newport recommends annual photodiode detector calibration.

Internal Temperature Sensor

The internal temperature sensor on the detector head is used to compensate the responsivity drift caused by the temperature change in the photodiode.  The responsivity change is most sensitive around the bandgap, or towards the longer wavelength limit.  The power meter calculates the temperature and automatically updates the responsivity value so that the measurements remain accurate.   This feature is enabled with the power meter models 1936-R, 2936-R, 1919-R, and 841-PE-USB.

Attenuator On/off Sensor

The attenuator on/off sensor is built in the detector head.  When a 918D series detector is connected to the power meter models 1936-R, 2936-R, 1919-R, 841-PE-USB, and the 1830-R series, the meter will automatically switch the responsivity value.  The user does not need to update the power meter setup.