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Attenuation-Induced Error Due to Thermal Lensing in Beam Measurement

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Attenuation-Induced Error Due to Thermal Lensing in Beam Measurement

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The need to profile lasers with powers in the 10 mW to 1 W range are becoming more common. Many of these lasers are in the visible spectrum, allowing them to be measured with CCD and CMOS camera systems. As with any laser that is being measured with a camera array, the beam needs to be attenuated, but there are some cautions to be observed. These beams are not so powerful that they will damage or destroy typical absorptive filters. In fact, it is possible to stack up a sufficient optical density to reduce the power of a 1W laser to the nW levels that will not saturate the detector. Unfortunately, doing this will more than likely result in erroneous measurements.

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