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Improving laser alignment in liquid
(A) Air bubbles can get stuck between the probe and the holder window and scatter the laser.
(B) Condensation can form on the inner surface of the holder window and scatter the laser.
(C) The water drop needs to make good contact between the slide and the probe to avoid scattering from an air-water interface.
(D) Water on the window method to dislodge air bubbles and make good liquid contact: pipette a small drop of water onto the holder window.
