Summary form only given. Traditionally, the most common measurement in optics is of electromagnetic field intensity. However, to fully characterise guided wave optical devices, one requires knowledge of the spatial variation of both the phase and amplitude within the device. In this work, we measure the intensity and relative phase in the near-field of guided modes in an overmoded optical fiber. For example, the LP/sub 11/ mode consists of two primary lobes of equal intensity but are /spl pi/ out of phase. We have utilised a Mach-Zender interferometer and the technique of near-field optical microscopy to measure this phase difference.
Direct measurement of optical phase in the near-field
1999-01-01
260775 byte
Conference paper
Electronic Resource
English
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