Newport’s 818T High-Power Detectors offer the highest quality in thermopile detectors. Utilizing an isothermal disk design, each 818T detector delivers accuracy, uniformity and rugged reliability for your CW or pulsed laser power measurements. All 818T detectors have a 1/4-20 tapped hole for post or plate mounting.
Typical applications include measurements of CW or pulsed Ion, Nd:YAG, Ti:Sapphire, CO₂, Holmium lasers, high-power laser diodes and Excimer measurements in the UV range (818T-150X).
The 818T-02 detector features a compact, low-profile design allowing the measurement of maximum continuous power of up to 2 W in tight spaces. The detector’s minimum detectable power of 1 mW makes it suitable for measuring laser diode outputs.
The 818T-300F fan-cooled detector bridges the gap between our air and water cooled high-power detectors. It can measure power levels of up to 300 W and requires no water cooling system. The low-noise, low-vibration fan inside the detector housing is powered via an AC/DC wall-plug adaptor, supplied with the detector.
The high-damage-threshold of the 818T Series High-Power Detectors is 10 times more rugged than typical black thermopile probes. Exceeding the damage threshold only degrades detector performance without causing catastrophic failure.
All detectors feature a proprietary detector surface, providing a 10 kW/cm² ...

Newport’s 818T High-Power Detectors offer the highest quality in thermopile detectors. Utilizing an isothermal disk design, each 818T detector delivers accuracy, uniformity and rugged reliability for your CW or pulsed laser power measurements. All 818T detectors have a 1/4-20 tapped hole for post or plate mounting.
Typical applications include measurements of CW or pulsed Ion, Nd:YAG, Ti:Sapphire, CO₂, Holmium lasers, high-power laser diodes and Excimer measurements in the UV range (818T-150X).
The 818T-02 detector features a compact, low-profile design allowing the measurement of maximum continuous power of up to 2 W in tight spaces. The detector’s minimum detectable power of 1 mW makes it suitable for measuring laser diode outputs.
The 818T-300F fan-cooled detector bridges the gap between our air and water cooled high-power detectors. It can measure power levels of up to 300 W and requires no water cooling system. The low-noise, low-vibration fan inside the detector housing is powered via an AC/DC wall-plug adaptor, supplied with the detector.
The high-damage-threshold of the 818T Series High-Power Detectors is 10 times more rugged than typical black thermopile probes. Exceeding the damage threshold only degrades detector performance without causing catastrophic failure.
All detectors feature a proprietary detector surface, providing a 10 kW/cm² CW and 0.3 J/cm² pulsed (0.5 J/cm² excimer) damage threshold. Additional details like a low specular reflectance front bezel (for protection from unwanted reflections), NIST-traceable calibration and competitive pricing establish maximum value for your dollar.
Calibrated measurements can be performed by ordering the /CM versions of these detectors for use with Newport’s 1835-C and 2835-C Optical Meters.
Calibration of optical detectors is required annually to assure NIST traceability. Newport’s recalibration services are geared to provide fast turnaround to meet your tight schedule. Please refer to Detector Calibration Services for more details (see Optical Detector Calibration Services).