918D-ST-SL
818-ST2/DB
Better calibration uncertainties than competition
Highly protective and rugged aluminum housing
Comfortably fitting on hand
Perfect for space tight applications
The 818-ST2 and 918D-ST series slim detectors are ideal for measurements in a tight space with busy setups.
| 918D-ST-SL | 818-ST2/DB |
Both the 818-ST2 series and the 918D-ST series incorporate a large 10 mm X 10 mm Si or Ge photodiode. These slim detectors are ideal for measurements in tight locations with busy setups. All models provide a built-in calibrated OD3 attenuator switch. With the 818-ST2 series, the calibration module is detachable from the BNC connector, allowing versatile interfacing with Newport meters, oscilloscopes, or current meters. The high performance 918D-ST series detectors feature the Attenuator On/Off sensor and the temperature sensor. The power readings are automatically corrected for the Attenuator position and are compensated for the temperature variation.
Newport\'s wand detectors 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 with and without the attenuator are shipped with each product. To maintain accuracy and guarantee performance Newport recommends annual photodiode detector calibration.
The built-in OD3 attenuators, calibrated for each matching detector and shipped together, extend 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 we are using, a wider dynamic range is achieved. For less than 1 mW input power, we recommend removing the attenuator to maximize the signal to noise ratio.
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 818-UV 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 calibration facility performs the tightest calibrations in the business, further improving the absolute accuracy of our detectors.
 918D-ST-UV |  818-ST2-UV/DB |
The UV detectors are packaged in clear anodized aluminum housing to avoid burning (resulting in potential damages on optics in the setup), especially in the UV wavelength range.
High power laser beam, especially in the short UV wavelength range, is highly absorbed by plastic material, in which most other wand detectors are packaged. This can potentially result in evaporation of the material and with the UV wavelength optical coating can easily be damaged. Newport’s 918D-ST and 818-ST2 Series are designed in aluminum housing to address this issue, and to make it workable in more challenging environments.
The models with the /DB suffix come with a detachable BNC/DB15 calibration module that provides direct compatibility with Newport’s current power meter offering. The models with the /CM suffix come with a detachable BNC/8-pin mini-DIN calibration module that provides compatibility with legacy Newport power meters. The standard BNC connector allows flexible interfacing with oscilloscopes, lock-in amplifiers or current meters. In both cases, the /CM and /DB adapters contain the detector calibration data, model number, serial number and calibration date for seamless operation with the power meter.