The 918D Series Photodiode Sensors are designed to outperform Newport's industry proven 818 Series Low-Power Calibrated Photodiode Sensors, by enhancing their performance with advanced features. These optical photodetectors feature integrated calibration data storage, built-in 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 with small temperature fluctuations. UV-enhanced silicon, silicon, germanium, indium gallium arsenide (InGaAs) detectors are available, covering the wavelength range from 200 to 1800 nm.
As with all other Newport low power photodiode sensors, the 918D Series include a full spectral response calibration utilizing NIST-traceable standards calibrated with high-precision equipment maintained in Newport’s optical detector metrology facility. Each detector is shipped with its individual 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.
The 1830-R is an ideal meter for use with the 918D series detectors.
To directly mount the 918D head to an optical table consider the 918D-BASE-KIT . The 918D-BASE-KIT has an optical axis height of 1.00" and is compatible with both Imperial and Metric table tops.
918D-BASE-KIT
Also available are a variety of Photodiode Sensor Accessories such as collimating lens assemblies, fiber optic adapters and a 1” optic holder.
See the Related Products tab for the latest compatible power meter models.
Laser Alignment
For laser alignment applications consider the all new LAKIT series laser alignment kit. Kits include a 918D series semiconductor detector or 818P thermopile, 1917-R power meter, post, post holder and clamping fork all at an excellent price.
LAKIT-SL-2W includes a 918D-SL-OD3 detector, 1917-R power meter, post, post holder and clamping fork.
Highest Quality Photodiodes Are Used in Newport Semiconductor Detectors
Newport uses the highest quality semiconductor detector materials available. 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 Sensor 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 Series Detector Specifications
|
Model |
918D-UV |
918D-SL |
918D-IR |
918D-IG |
| Spectral Range (nm) |
200 to 1100 |
400 to 1100 |
780 to 1800 |
800 to 1650 |
| Power Density, Average Max w/ Attenuator (W/cm2)(1) |
0.2 |
2 |
2 |
2 |
| Power Density, Average Maximum w/o Attenuator (mW/cm2)(1) |
0.2 |
2 |
3 |
3 |
| Pulse Energy Density, Maximum - w/ Attenuator (µJ/cm2)(2) |
0.10 |
1 |
0.35 |
0.35 |
| Pulse Energy Density, 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% @ 400-940nm, 4% @ 941-1100nm |
2% @ 780-910nm, 2% @ 911-1700nm, 4% @1701-1800nm |
2% @ 800-900nm, 2% @ 901-1650nm |
| Calibration Uncertainty (With Attenuator)(5) |
8% @ 200-219nm, 2% @ 220-349nm, 1% @ 350-949nm, 4% @ 950-1100nm |
1% @ 400-940nm, 4% @ 941-1100nm |
5% @ 780-910nm, 2% @ 911-1700nm, 4% @ 1701-1800nm |
5% @ 800-900nm, 2% @ 901-1650nm |
| Uniformity (%)(3) |
±2 |
| Linearity (%) |
±0.5 |
| Rise Time (µs) |
≤5.9 |
≤2 |
≤2 |
≤2 |
| Shunt Resistance (MΩ) (typ), @-10V |
≥10 |
≥10 |
≥35 (kΩ) |
≥20 |
| Reverse Bias, Maximum (V) |
5 |
3 |
0.25 |
2 |
| NEP (pW/√Hz) |
0.45 |
0.2 |
0.6 |
0.04 |
| Material |
UV Enhanced Silicon |
Silicon |
Germanium |
Indium Gallium Arsenide |
| Active Area (cm2) |
1 |
0.071 |
| Active Diameter (cm) |
1.13 |
0.3 |
| Shape |
Cylinder |
| Attenuator |
Built-In OD3 |
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 photodiode only. It does not apply to the attenuator.
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
