Beams in an optics course- great paper written by Kiko Galvez of
Colgate University that gives all background information on Guassian,
HG and LG modes.
Experiment to observe the intensity and phase structure of Laguerre-Gaussian laser
modes - paper written by Padgett, Arlt, and Simpson that also provides good
background knowledge for laser modes and also explains in depth the theory behind an
astigmatic mode converter, which converts HG modes to corresponding LG modes.
experiment information script: Examination of Laser
Modes -written by Padgett that describes the method for interfering
two LG modes of equal but opposite azimuthal index by use of a dove prism