| http://www.w3.org/ns/prov#value | - To show the importance of physical apertures with respect to sample flow induced perturbations, a device similar to that shown in FIG. 3 is illustrated in FIG. 5, except the device, as illustrated in FIG. 5, has a physical aperture 39 (a thin metallic aperture, such as 1.0 mm in diameter) added within the laser cavity to add a non-trivial level of diffraction loss (the cavity power was reduced by
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