Compare Model Drawings, CAD & Specs Availability Price
Optical Power Detector, UV Silicon, 200-1100nm, DB15 Calibration Module
3 Weeks
3 Weeks
Optical Power Detector, Silicon, 400-1100 nm, DB15 Calibration Module
3 Weeks
3 Weeks
Optical Power Detector, Germanium, 780-1800 nm, DB15 Calibration Module
In Stock
In Stock
Optical Power Detector, InGaAs, 800-1650 nm, DB15 Calibration Module
In Stock
In Stock



Excellent Photodiode Linearity

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.

Responsivity Variation over Temperature

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.

Factors that Affect Maximum Measurable Power

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.

NIST-traceable Sensor Calibration

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.

Detector calibration system block diagram.

Wide Dynamic Range with OD3 Attenuator

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.

Removable OD3 Attenuator

For less than 1 mW input power (or 0.1 mW for 818-UV/DB between 200-400 nm), removing the OD3 attenuator by unscrewing it from the detector head is recommended to maximize the signal-to-noise ratio.

Removable Calibration Module

The 818 series detectors include a BNC connector with a removable calibration module. The /DB suffix indicates a DB15-style calibration module that is directly compatible with Newport’s current power meters. Models with the /CM suffix, which include a legacy round 8-pin mini-DIN module and the BNC connector models, 818-xx, are no longer available. For older instruments that require no calibration module (BNC), we recommend that customers purchase 818-xx/DB and simply remove the DB15 calibration module. Please order the 818-SCAL-OPT when only a new calibration module is needed for the 818 Series photodiode detectors, without the need to recalibrate the detector.

Additional Functionality with BNC Connector

The BNC connector extends the functionality of the 818 Series photodiode sensors. It enables direct connection to an ammeter or lock-in amplifier. It also allows the detector output to be viewed on an oscilloscope after first connecting it to a current-to-voltage preamplifier, such as Newport's model 70710. Furthermore, the cable length can be extended by connecting another BNC cable.

Adapters for Fiber-Optic Applications

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.

Compatible Power Meters

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 818 Series sensors. For more detailed information about our power meters, please see our Optical Power Meter Guide.










Measurement Modes


Peak-to-Peak Power

RMS Power




Power Power 
Analog Bandwidth Up to 400 kHz Up to 20 kHz  15 Hz  15 Hz 15 Hz 
Data Storage 250,000 pts internal   Limited by USB memory size

843-R-USB: Via PMManager

843-R: None

Via PMManager
Measurement Rate per Second 10,000 20 15 15 15 
Trigger In/Out
Computer Interface








843-R-USB: USB

843-R: None

Only available with model 1830-R-GPIB

Additionally, please refer to Newport Power Meter and Detector Legacy and Compatibility for a complete list of meters that are compatible with this model.