Microfabricated sensor device for CW and pulsed laser power measurements

On-line measurement is a trend of development toward laser-based applications. We present a fiber-integrated force sensor device for laser power measurement with both CW mode and pulse mode based on laser radiometric heat and radiation force sensing simultaneously. The sensor device is fabricated using a standard microfabrication process. Laser intensity is determined through the displacement of a movable mirror measured by an integrated Fabry-Perot interferometer. Compared with the performance of the device in the ambient condition, a non-linearity error of 0.02% and measurement uncertainty of 2.06% is observed in the quasi-vacuum condition for CW laser illumination. This device can measure a CW laser power with a 46.4 mu W/Hz(1/2) noise floor and a minimum detection limit of 0.125mW. For a pulsed laser, a non-linearity error of 0.37% and measurement uncertainty of 2.08% is achieved with a noise floor of 1.3 mu J/Hz(1/2) and a minimum detection limit of 3 mu J. (c) 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Automated summary

This article presents a fiber-integrated force sensor device for laser power measurement based on laser radiometric heat and radiation force sensing. The device determines laser intensity through the displacement of a movable mirror measured by an integrated Fabry-Perot interferometer. The device exhibits a non-linearity error of 0.02% and measurement uncertainty of 2.06% in the quasi-vacuum condition for CW laser illumination, and a non-linearity error of 0.37% and measurement uncertainty of 2.08% for pulsed lasers.