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(a) Video image of the glass capillary. The tip has a diameter of 20 µm. (b) The same glass capillary is exposed to IR light (10 W power). The beam is clearly visible from the bright halo that it gives. The x, y, z coordinates corresponding to the xyz axis of the micro-manipulator of the laser optic are also shown. The centre of the white spot marks the centre of the laser beam.
