918D Series advanced free space photodiode sensors are calibrated for use with newport power meters. They feature a built-in, switchable attenuator with an On/Off sensor for the power meter and a temperature sensor to adjust for temperature dependent responsivity changes. Utilizing NIST-traceable standards and calibrated with high-precision equipment these optical power detectors offer the lowest calibration uncertainty in industry.
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918D-IG-OD1R Optical Power Detector, InGaAs, 800-1650 nm, OD1 Attenuator |
In Stock
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$1,648.00 |
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918D-IG-OD2R Optical Power Detector, InGaAs, 800-1650 nm, OD2 Attenuator |
In Stock
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$1,606.00 |
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918D-IG-OD3R Optical Power Detector, InGaAs, 800-1650 nm, OD3 Attenuator |
In Stock
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$1,389.00 |
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918D-IR-OD1R Optical Power Detector, Germanium, 780-1800 nm, OD1 Attenuator |
6 Weeks
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$940.00 |
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918D-IR-OD2R Optical Power Detector, Germanium, 780-1800 nm, OD2 Attenuator |
In Stock
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$1,020.00 |
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918D-IR-OD3R Optical Power Detector, Germanium, 780-1800 nm, OD3 Attenuator |
In Stock
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$850.00 |
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918D-SL-OD1R Optical Power Detector, Silicon, 400-1100 nm, OD1 Attenuator |
In Stock
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$830.00 |
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918D-SL-OD2R Optical Power Detector, Silicon, 400-1100 nm, OD2 Attenuator |
In Stock
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$877.00 |
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918D-SL-OD3R Optical Power Detector, Silicon, 400-1100 nm, OD3 Attenuator |
6 Weeks
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$729.00 |
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918D-UV-OD3R UV Silicon Detector, 200-1100 nm, OD3 Attenuator |
6 Weeks
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$866.00 |
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These photodiodes show excellent linearity over a large dynamic range. This is ideal for use in applications that require high accuracy measurements down to the pW level, especially when combined with a high sensitivity power meter that can accommodate the large dynamic range of the optical signal.
A natural characteristic of a photodiode is for the its optical response to change as the temperature changes near the bandgap of semiconductor materials. Newport’s 918D series sensors feature a thermocouple near the photodiode, which allows certain Newport meters to read the temperature and automatically adjust the responsivity, ensuring the most accurate measurements.
The maximum measurable power of photodiode sensors is dependent on several factors such as the wavelength of incoming light, photodiode current output saturation, temperature, use of an attenuator and a power meter's maximum current input value. Newport provides maximum power specifications based on the power meter models, with and without an attenuator, and wavelength-dependent maximum power level. With these factors affecting measurable power in mind, choosing the proper detector for your application is critical.
The attenuator on/off sensor is built into the detector head. When a 918D series detector is connected to power meter models 1936-R, 2936-R, 1919-R, 841-PE-USB, and the 1830-R series, the meter automatically switches the responsivity value. The user does not need to update the power meter setup. The detector is calibrated with the integrated attenuator and without it, and the data is saved in the EEPROM.
The 884 Series OD3 attenuators extend the calibrated optical dynamic range of our detectors by three decades. Both the attenuator and detector have their serial number scribed on the part which, to maintain calibration, must match. Our attenuator design provides high damage threshold and spectral flatness. With the low noise equivalent power (NEP) associated with the photodiodes being used, a wider dynamic range is achieved. The clear aperture of the 884 Series attenuators is 10.3 mm.
Our calibrated photodiode sensors 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 models. To maintain accuracy and guarantee performance, Newport recommends annual photodiode detector calibration.
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 844-PE-USB.
These photodiode sensors can be converted to measure optical power from connectorized or bare optical fibers. Newport offers a comprehensive set of screw-in fiber-optic adapters to match a variety of connector types. Our bare fiber holder and adapter mount are designed together to hold 250-µm bare fibers without damaging the fiber.
A photodiode consists of a semiconductor p-n junction similar to a laser diode and LED However, the fundamental radiation process involved is absorption. Light falling on the junction causes the formation of electron-hole pairs. In photovoltaic mode, the electron-hole pairs migrate to opposite sides of the junction, thus producing a voltage. One critical difference between a semiconductor photon source and a photon detector is that the former requires the use of a direct-gap semiconductor while the latter can utilize an indirectgap semiconductor. While the simultaneous requirement for energy and momentum conservation makes photon emission much less likely in indirect-gap semiconductors, this is not the case for absorption. A readily-achievable two-step process occurs where an electron is excited to a high level in the conduction band followed by a relaxation process where its momentum is transferred to phonons. Since this process can be sequential, it is much more likely than an emission process where the two steps must occur simultaneously. Please see our Photodiode Sensor Physics technical note for additional information.
Newport offers a comprehensive range of optical power meters from low cost, hand-held meters to the most advanced dual-channel benchtop meter available in the market. Presented here is a list of meters compatible with the 918D Series sensors. For more detailed information about our power meters, please see our Optical Power Meter Guide.
 1938-R/2938-R |
 1936-R/2936-R |
 1830-R/1830-R-GPIB |
 1919-R |
 843-R/843-R-USB |
 845-PE-RS |
 844-PE-USB |
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| User Interface | Touchscreen | Advanced | Simple | Advanced | Simple | User Commands, PMManager | PMManager only |
| Temperature Sensing | ✔ | ✔ | ✔ | ✔ | ✔ | ||
| Automatic Attenuator Sensing | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | |
| Measurement Capabilities | Power (15 Hz) Fast Power (10 kHz) Low Frequency Power Pulsed Power Peak-to-Peak Power, RMS Power, Exposure, Current |
Power Peak-to-Peak Power, RMS Power, Current |
Power | Power, Exposure |
Power | Power Low Freq. Power |
Power Low Freq. Power |
| Analog Bandwidth | Up to 200 kHz | Up to 400 kHz | Up to 20 kHz | 15 Hz | 15 Hz | 15 Hz | 15 Hz |
| Data Storage | 2 GB internal, External USB memory stick, Via PMManager |
250,000 pts internal | Limited by USB memory size | 
$1,342.00
In Stock
Product Series Overview
$1,067.00
In Stock
Product Series Overview
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Via PMManager | Via PMManager | |
| Measurement Rate per Second | Normal: 15 Fast Mode: 10,000 |
10,000 | 20 | 15 | 15 | 15 | 15 |
| Trigger In/Out | ✔ | ✔ | |||||
| Analog Out | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
| Computer Interface | USB RS232 |
USB RS232 |
Product Series Overview
Sorry, this product is no longer offered for sale. It was discontinued on Feb 1, 2024.
Product Series Overview
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USB RS232 |
$1,342.00
In Stock
Product Series Overview
$1,067.00
In Stock
Product Series Overview
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RS232 | USB |
Please refer to Newport Power Meter and Detector Legacy and Compatibility for a complete list of meters that are compatible with this model.
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