818-IG In Stock

The 818-IG by Newport is an InGaAs Photodetector designed to provide precise light measurement capabilities. Notable for its versatility and accuracy, this photodetector incorporates a removable threaded OD3 attenuator with assigned serial numbers, ensuring compliance with NIST-traceable standards. The 818-IG boasts a clear aperture of 10 mm, accompanied by cross hairs that significantly enhance the alignment of the photodetector with the optimal input beam. This alignment refinement not only ensures impeccable accuracy but also serves as a safeguard against overfilling of the photodetector.

The 818-IG is strategically placed at an 8-degree angle from the front face of the detector housing. This well-considered positioning effectively mitigates back reflection issues originating from the sensor surface. Furthermore, the photodetector incorporates compatible BNC/DB15 calibration modules, enhancing its utility in various measurement setups. The operational parameters of the 818-IG are contingent upon several factors, namely the wavelength of the incident light, photodiode current output saturation, temperature, the presence of an attenuator, and the maximum current input value of the photodetector. The provided OD3 attenuator can be conveniently detached to accommodate input power levels below 1 mW. This simple process, involving the unscrewing of the attenuator from the detector head, offers the advantage of optimizing the signal-to-noise ratio.

For enhanced versatility, the 818-IG can be easily adapted to measure optical power from connectorized or base optical fibers through compatible screw-in fiber-optic adapters. These adapters support the secure integration of both bare fiber holders and adapters, allowing for the safe accommodation of 250 µm fibers without causing any damage to the delicate fiber structures. Facilitating streamlined instrumentation connections, the photodetector is equipped with a BNC connector. This versatile connector enables direct links to an ammeter or lock-in amplifier, while also affording the convenience of observing detector output on an oscilloscope.