The 919P-5kW-50 Water Cooled Thermopile Sensor is a general purpose thermal sensor measuring optical power up to 5000 W. It's BB absorber type is spectrally flat and covers the wavelength range 190 nm to 11 µm. It has a large active diameter of 50 mm and can measure continuous optical power from 20 to 5000 W. 3/8" QuickConnect fittings are;mounted on the sensor head for convenient connection of cooling water tubes. At full power, minimum 5 liter/min water flow rate is required and 8 liter/min is recommended (water temperate 18 to 30 C, with < 1 °C/min variation). It has a 1/4-20 tapped hole for post or plate mounting and includes a 2.25 inch long 1/2 inch diameter post with a 1/4-20 tapped hole on both ends.
The thermopile detector’s response to the input laser beam is characterized by its absorption. Newport thermopile sensors use four different types of coating in the sensors. The broadband BB type is employed in most of the 919P models and has an excellent absorption throughout the responsive wavelength range. The CM and SV types are used mainly with high repetition lasers with ultra-short pulses and have a relatively flat response.
The 919P sensors using BB and SV absorbers can measure wavelengths up to 11 µm, while the CM sensors can measure up to 9.4 µm.
The PF type has wavelength dependent response, and it is employed in the sensor 919P-050-18HP, which is specially designed for high energy density pulses and can measure up to 2.2 µm.
The 919P series thermopile detectors have been extensively tested for the damage threshold with a variety of lasers. You can trust our specifications and have your mind at ease.
Each 919P thermopile sensor includes a DB15 connector and internal EEPROM for storing factory calibration data. Most sensors (BB) are calibrated at three different wavelengths at 532 nm, 1070 nm and 10.6 µm. Other sensor types (PF, CM and SV) use other or additional wavelengths for their calibration for example: 190, 248, 355, and 2100 nm. Calibration of the thermopile detectors is recommended annually to assure NIST traceability.
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