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Thermal Laser Power Sensor, BB Type, 40 mW to 50/150 W, Ø26 mm, 0.19-11 µm

If you need to measure beam position or size in addition to power, we offer the 50(150)A-BB-26-PPS and 50(150)A-BB-26-QUAD (position only) BeamTrack version of this sensor.


  • Product Name
  • Absorber Type
    BB - Broadband general purpose
  • Aperture Size
    Ø26 mm
  • Spectral Range
    0.19-11 µm
  • Minimum Power
    40 mW
  • Maximum Average Power
    50 W
  • Maximum Power Intermittently
    150 W
  • Minimum Pulse Energy
    20 mJ
  • Maximum Pulse Energy
    100 J
  • Response Time
    1.5 s
  • Maximum Average Power Density
    12 kW/cm²
  • Maximum Energy Density <100 ns
    0.3 J/cm²
  • Maximum Energy Density 2 ms
    10 J/cm²
  • Cooling
  • Dimensions
    64 x 64 x 64 mm (LxWxD)
  • Cable Length
    1.5 m
  • CE Compliance
  • UKCA Compliance
  • China RoHS Compliance


Choosing a Thermal Sensor

In this short “Basics” video we review the use – and selection - of thermal sensors for measuring low, medium and high laser powers.

How to Measure Power of Broadband Sources

This video explains how to use Ophir sensors and meters to measure the power or energy of broadband light sources such as solar radiation, flash lamps, LEDs, etc.

Thermal Power Sensor Accuracy

Ophir former CTO Dr. Ephraim Greenfield discusses the various factors that contribute to uncertainties in measurement when using Ophir laser power and energy meters.

Effects of Incidence Angle on Measurements

In this video, you will learn to what degree a beam’s incidence angle matters, and for which sensor types this should be taken into account.

Thermal Sensor Calibration

As the spectral sensitivity of the absorber used for the power and energy measurement is not fully linear, Ophir sensors get a high precision calibration by default with more than one wavelength.

Each thermal sensor is calibrated independently of a particular Ophir power meter with its calibration information contained in the DB15 plug. When the sensor is connected to the meter, the meter reads and interprets this information to display a calibrated reading. Each power meter is calibrated independently and has the same sensitivity as an other meter within about 2 tenths of a percent.

Unless otherwise indicated, Ophir sensors and meters should be recalibrated within 18 months after initial purchase, and then once a year after that.

Absorption of different thermal sensor absorber types
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