818P Series thermopile detectors

Newport has introduced three additions to the Newport 818P Series of thermopile detectors, the fan-cooled 818P-500-55, the water-cooled 818P-3KW-060, and the high-sensitivity 818P-001-12NIR. Newport is meeting more demanding customer requirements with these updated sensors, one of which is capable of measuring as low as 1µW with very low thermal drift, and another which can measure up to 3kW of CW optical power, which is well suited to fibre lasers and CO2 lasers.

The first model, the 818P-500-55 thermopile detector with a cooling fan, can handle up to 500W of continuous optical power (up from Newport's previous 400W limit for a fan-cooled thermopile detector). The new device also features a large 55mm diameter active area and very flat responses in an extended wavelength range from 0.19 to 20µm.

Newport's second model, the 818P-3KW-060, is a water-cooled detector that can handle up to 3kW of CW optical power, the highest possible power for Newport optical detectors. When illumination is limited, it can handle up to 4kW of power for up to five minutes. Strategically designed to perform effectively and with low sensitivity to the cooling water temperature, this model is ideal for lasers with a very high optical output power, such as CO2 lasers and fibre lasers. Output connections include an attached cable with a DB15 connector (for use with a Newport optical power meter) and/or a USB port for direct interface without a power meter.

The third product in the family is the innovative, high sensitivity 818P-001-12NIR thermopile optical sensor. It is designed to measure down to micro-watt-level optical power, with a wavelength range from 0.28 to 1.36µm. This product is insensitive to beam position and offers the spatial dependence of thermopiles, while retaining the high sensitivity only available with photodiodes. Ideal for users working with lasers in the µW and mW range and those who require a much lower thermal drift (a low of 6µW/°C) than standard thermopile detectors. Newport’s 818P-001-12NIR is calibrated with a fused silica window mounted on the tube, so that long wavelengths (>1.36µm) can be cut out of the measurement.