Abstract

An in-line, single-mode fiber-optic spectrometer is described and analyzed. Its key element is a photoresist grating placed in the evanescent field near the core on a side-polished fiber. Fabrication and nearly diffraction-limited performance (resolution Δλ ≈ 1 nm) are reported, and means are proposed to increase the resolution by several orders of magnitude.

© 1985 Optical Society of America

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