In situ measurement of laser power at the focus of a high numerical aperture objective using a microbolometer

Details In situ measurement of laser power at the focus of a high numerical aperture objective using a microbolometer In situ measurement of laser power at the focus of a high numerical aperture objective using a microbolometer

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apphl..81.1765v&link_type=abstract

Applied Physics Letters, vol. 81, iss. no. 10, p. 1765-1767

Physics

4

Bolometers, Focusing, In Situ Measurement, Laser Beams, Laser Outputs, Lenses, Microinstrumentation, Micromechanics, Microscopy, Numerical Aperture, Optical Microscopes, Sensors, Conventional Optical Microscopes, Lenses, Prisms And Mirrors, Bolometers, Infrared, Submillimeter Wave, Microwave, And Radiowave Receivers And Detectors, Photodetectors, Measurements In Electric Variables, Micromechanical Devices And Systems, Beam Characteristics: Profile, Intensity, And Power, Spatial Pattern Formation

Scientific paper

We built a simple mercury-based microbolometer to measure "in situ" laser power at the focus of high numerical aperture objectives used in optical microscopy and optical tweezers. With an optical microscope equipped with a high numerical aperture objective, we visualize a mercury droplet immersed in water that is heated by an infrared laser, whose power we want to determine. For a given laser power the mercury droplet reaches the boiling temperature of the water and then jumps, making a precise determination of this point very easy. We solve the heat equation for this system and, using known material parameters and the size of the mercury droplet, we determine the local power of the infrared laser.

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