Is it possible to get a Gaussain TEM00 mode in a resonator when we added an aperture with dimension less than beam waist in its position?
Transverse mode - Wikipedia
Shanghai Dream Lasers Technology - DPSS Green, Blue & Red Lasers, Precision Optics and Crystals
Chapter 2 Basic Concepts
Lenses For Flow Cytometry About Flow cytometers use lasers to illuminate particles confined to the centre of a stream. The beam is focused down to a small spot using lenses, with the effect of increasing the overall intensity of the light for any particle ...