Newport Corporation | Low-Power Photodetectors, 918D Series

Low-Power Photodetectors, 918D Series

Compatible Power Meter Models

Automatic thermal drift compensation
Integrated attenuator allows easy extension of measurement range, selectable from 10X to 1000X
Free-space and fiber optic measurements
Calibration data electronically stored inside detector
2 m long cable allows easy integration into test systems

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DescriptionSpecifications Models

The Most Advanced Photodiode Detectors in Market

The 918D Series Low-Power Detectors were developed to interface with our new generation power meters ( Optical Power Meter, High-Performance Hand-Held, 1918-C, Portable Optical Power Meter, 842-PE, Portable Optical Power Meter, 1916-C) utilizing a 15-pin D-Sub connector to expand signal handling capability. The 918D Series is designed to outperform Newport's industry respected 818 Series low-power detector family (see Low-Power Photo-Detectors, Legacy 818 Series), by enhancing their performance with advanced features.

These sensor heads feature integrated calibration-data storage, integrated OD1, OD2 or OD3 attenuation filter with electronic position sensing (attenuator On/Off), and temperature sensing electronics for temperature drift compensation, making the detector more accurate in environments even with small temperature fluctuations.

Highest Quality Photodiodes Are Used in Newport Semiconductor Detectors (same as 818-ST page)

Newport uses the highest quality semiconductor detector materials available in our 818 Series Low-Power Detectors. In addition, each detector arrives with a complete full-spectrum calibration report detailing detector responsivity in 10 nm increments. Newport’s advanced in-house calibration facility performs the tightest calibrations in the business, further improving the absolute accuracy of our detectors. For more information, refer to Detector Calibration Services (see Optical Detector Calibration Services).

Plots of various photodiode characteristics

Low NEP (Noise Equivalent Power) with a Wide Dynamic Range

Exclusive OD3 attenuator technology extends the calibrated optical dynamic range of our Cylindrical and Hand-Held Wand Detectors by three decades. Our patented attenuator design provides low reflection, high damage threshold and spectral flatness, without the damage susceptibility problems of thin-film attenuators or the spectral variance of simple volume-absorbing attenuators. With the low NEP associated with the photodiodes Newport is using, a wider dynamic range is achieved.

Typical spectral responsivity of Newport's low power detectors

918D-BASE-KIT

918D-BASE-KIT with mounted 918D detector.
918D-BASE-KIT has an optical axis height of 1.00" and is compatible with both Imperial and Metric table tops.

918D Series Detector Specifications

Model	918D-UV	918D-SL	918D-IR	918D-IG
Spectral Range (µm)	0.2–1.1	0.4–1.1	0.78–1.8	0.8–1.65
Power, Average Max w/ Attenuator (W/cm²)⁽¹⁾	0.2	2	2	2
Power, Average Maximum w/o Attenuator (mW/cm²)⁽¹⁾	0.2	2	3	3
Pulse Energy, Maximum - w/ Attenuator (µJ/cm²)⁽²⁾	0.1	1	0.35	0.35
Pulse Energy, Maximum - w/o Attenuator (nJ/cm²)⁽²⁾	0.1	1	0.35	0.35
Calibration Uncertainty (Without Attenuator)⁽⁵⁾	4% @ 200-219nm, 2% @ 220-349nm, 1% @ 350-949nm, 4% @ 950-1100nm	1% @ 400-920nm, 4% @ 921-1100nm	2% @ 780-1700nm, 4% @ 1701-1800nm	2% @ 800-1650nm
Calibration Uncertainty (With Attenuator)⁽⁵⁾	8% @ 200-350nm, 2% @ 351-390nm, 1% @ 391-920nm, 4% @ 921-1100nm	1% @ 400-920nm, 4% @ 921-1100nm	5% @ 780-910nm, 2% @ 911-1700nm, 4% @ 1701-1800nm	5% @ 800-900nm, 2% @ 901-1650nm
Uniformity (%)⁽³⁾	±2	±2	±2	±2
Linearity (%)	±0.5	±0.5	±0.5	±0.5
Saturation Current Density (mA/cm²)	0.1	2	2	2
Responsivity	≥0.09 A/W 250–1000 nm	>0.1 A/W 400–1000 nm	≥0.2 A/W 850–1700 nm	≥0.1 A/W 800–1600 nm
Responsivity (Peak)	>0.4 A/W	>0.5 A/W	>0.8 A/W	>0.9 A/W
Rise Time (µs)	≤2	≤2	≤2	≤2
Shunt Resistance (MΩ) (typ)	≥2	≥2	≥35 (kΩ)	≥20
Die Capacitance (pF)	8,800	12,000	14 ( nF)	1500
Reverse Bias, Maximum (V)	100	10	0.25	2
NEP (W/√Hz)	8.9 x 10^-13	5.5 x 10^-13	0.7 x 10^-12	3.0 x 10^-14
Material	Silicon-Uv Enhanced	Silicon	Germanium	Indium Gallium Arsenide
Active Area (cm²)	1	1	0.071	0.071
Active Diameter (cm)	1.13	1.13	0.3	0.3
Shape	Cylinder	Cylinder	Cylinder	Cylinder
Attenuator	Built-In OD1, OD2 or OD3⁽⁴⁾	Built-In OD1, OD2 or OD3⁽⁴⁾	Built-In OD1, OD2 or OD3⁽⁴⁾	Built-In OD1, OD2 or OD3⁽⁴⁾
Calibration	Stored Internally
Operating Temperature	5°C to 50°C, <70% RH

1) Applies to entire spectral response, max w/ attenuator is for OD3. For OD2 derate listed value by 10x, & for OD1, derate value by 100x.
2) 15 ns pulse width, max w/ attenuator is for OD3. For OD2 derate listed value by 10x, & for OD1, derate value by 100x.
3) Uniformity specification applies to detector only.
4) Selected at time of ordering.
5) Calibration uncertainty can be varied depending on the NIST transfer standard uncertainty variation.

Built-in attenuator (OD1, OD2 or OD3) and temperature sensor

	Model	Description
	918D-BASE-KIT	Base Mounting Kit, 918D, Anodized Aluminum with Flanges
	918D-IG-OD1	InGaAs Photodetector, 800–1650 nm, OD1 Attenuator, DB15
	918D-IG-OD2	InGaAs Photodetector, 800–1650 nm, OD2 Attenuator, DB15
	918D-IG-OD3	InGaAs Photodetector, 800–1650 nm, OD3 Attenuator, DB15
	918D-IR-OD1	Germanium (Ge) Photodetector, Ge, 780–1800 nm, OD1 Attenuator, DB15
	918D-IR-OD2	Germanium Photodetector, 780–1800 nm, OD2 Attenuator, DB15
	918D-IR-OD3	Germanium Photodetector, 780–1800 nm, OD3 Attenuator, DB15
	918D-SL-OD1	Silicon (Si) Photodetector, 400–1100 nm, OD1 Attenuator, DB15
	918D-SL-OD2	Silicon Photodetector, 400–1100 nm, OD2 Attenuator, DB15
	918D-SL-OD3	Silicon Photodetector, 400–1100 nm, OD3 Attenuator, DB15
	918D-UV-OD3	UV Enhanced Silicon Photodetector, 200–1100 nm, OD3 Attenuator, DB15

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