Abstract
The Gouy phase advance can now be measured with the use of microwaves with no more complex equipment than used for the standing-microwave experiment for an accuracy of 10%. Recordings have been made at focal lines and focal points along the axis of the focusing mirror for a distance of nine wavelengths. A homemade parabolic cylindrical mirror and a commerical 12-cm wavelength source can be used to demonstrate this phase advance. The nodes of intensity near the focus show the increase in wavelength and can be marked on a meterstick when detected by a crystal detector.
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