Single-frequency narrow linewidth 2 μm fiber laser

Details Single-frequency narrow linewidth 2 μm fiber laser Single-frequency narrow linewidth 2 μm fiber laser

2006-09-12

2006-09-12

Harvey, Minsun Oh (Department: 2828)

Coherent light generators

Optical fiber laser

C372S102000, C372S032000

Reexamination Certificate

active

07106762

ABSTRACT:
A compact single frequency, single-mode 2 μm fiber laser with narrow linewidth, <100 kHz and preferably <100 kHz, is formed with a low phonon energy glass doped with triply ionized rare-earth thulium and/or holmium oxide and fiber gratings formed in sections of passive silica fiber and fused thereto. Formation of the gratings in passive silica fiber both facilitates splicing to other optical components and reduces noise thus improving linewidth. An increased doping concentration of 0.5 to 15 wt. % for thulium, holmium or mixtures thereof produces adequate gain, hence output power levels for fiber lengths less than 5 cm and preferably less than 3 cm to enable single-frequency operation.

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