Advisors: Prof. Hal Metcalf / Dr. John Noé
The field distribution in the HG mode HG1,0 rotated 45o or 135º relative to the x-axis ( without the propagation factor ) is equivalent to the sum ( or difference ) of two HG 0,1 and HG1,0 modes,
Approximated field distribution : two out-of-phase fundamental Gaussian beams
The intensity distributions corresponding to the fields (4) and (5) are similar (see Fig.)
Beam splitter BS1 splits a beam from a He-Ne laser oscillating in the fundamental mode into two beams. The mirrors
and the beam splitter BS2 are adjusted so that the beam from the two arms are slightly misaligned.
Changing the relative phase between the beams by moving a prism we can get the required field distribution at the
input of the mode convertor.
I deeply appreciate Dr. John Noe for his instruction and
generous help, both for the physics and the webpage. I would like to thank
Prof. Harold Metcalf's group members for help and supply.
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Institut für Experimentalphysik Universität Wien, Austria