The OD3 attenuators built in the housing 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.

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. 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 when only a new calibration module is needed for the 818 Series photodiode detectors, without the need to recalibrate the detector.

Newport’s 918D-ST-UV and 818-ST2-UV/DB are offered in clear, anodized aluminum housings for maximum durability in harsh environments and to avoid laser burns, particularly in the UV range. The plastic materials in which many competitors' wand detectors are packaged are highly absorbent to high power laser beams, especially in the short UV wavelength range, potentially evaporating materials and causing damage to UV wavelength optical coatings.