818-SL In Stock

The Newport 818-SL is a Silicon Optical Photodiode Sensor meticulously engineered to complement compatible power meters. Designed with precision and versatility in mind, this sensor incorporates a threaded OD3 attenuator that can be easily removed, and employs meticulously calibrated NIST-traceable standards alongside high-precision equipment to deliver exceptionally low calibration uncertainty. The defining feature of the 818-SL lies in its remarkable linearity across an extensive dynamic range. This attribute renders it particularly suitable for applications necessitating measurements of utmost accuracy, even down to the pW level.

The 818-SL's performance is further enhanced when coupled with a high sensitivity power meter, allowing it to seamlessly accommodate the substantial dynamic range of optical signals. The sensor's maximum measurable power is subject to multiple factors, encompassing the power meter's maximum current input capacity, utilization of an attenuator, temperature fluctuations, photodiode current output saturation, and the wavelength of incoming light. The OD3 attenuator integrated into the 818-SL can be conveniently detached from the detector head, optimizing the signal-to-noise ratio for input powers below 1 mW. This adaptability allows the sensor to be configured for measuring optical power from either connectorized or bare optical fibers, facilitated through the incorporation of screw-in fiber-optic adapters. Furthermore, the sensor accommodates 250 µm bare fibers without causing any damage.

Boasting a BNC connector equipped with a removable calibration module, the 818-SL extends its functionality to interface with lock-in amplifiers or ammeters. This connector permits the detector output to be visualized on an oscilloscope, provided the sensor is connected to a current-to-voltage preamplifier. Expansion of the connectable cable length is achievable via the connection of additional BNC cables. As with semiconductor materials, the 818-SL exhibits a natural change in its optical response relative to temperature fluctuations near the bandgap. Notably, the sensitivity of the photodiode increases with longer wavelength temperatures surpassing the peak response wavelength. Adherence to temperature limits is vital, with a recommended maximum temperature of 50°C and a humidity level not exceeding 70%, to avert potential damage to the photodiode.