Fiber laser, spontaneous emission light source and optical...

Optical waveguides – Optical fiber waveguide with cladding

Reexamination Certificate

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C359S341500, C372S006000

Reexamination Certificate

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10530133

ABSTRACT:
New fiber lasers, spontaneous emission sources, and optical fiber amplifiers are provided. Their conventional counterparts, which have a fiber doped with thulium (Tm) ions and excited by 0.67 μm or 0.8 μm pumping light, have a problem in that their characteristics are deteriorated with the elapse of time. The new fiber lasers, spontaneous emission sources, and optical fiber amplifiers use 1.2 μm light as pumping light. Alternatively, they use a pumping source for exciting the thulium from the lowest energy level3H6to3H5excitation level. As a more preferable configuration, they improve the emission efficiency at 2.3 μm band by disclosing Tm-doped host glass.

REFERENCES:
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patent: 2002-299731 (2002-10-01), None
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J.Y. Allain et al.,Tunable CW Lasing Around 0•82, 1•48, 1•88 and 2•35 μm in Thulium-Doped Fluorozirconate Fibre, Electronics Letters, vol. 25, No. 24, Nov. 23, 1989, pp. 1660-1662.
Atsushi Taniguchi et al.,1212 nm Pumping of 2 μm Tm-Ho-Codoped Silica Fiber Laser, Applied Physics Letters, vol. 81, No. 20, Nov. 11, 2002, pp. 3723-3725.
P.R. Barber et al.,Infrared-induced Photodarkening in Tm-doped Fluoride Fibers, Optics Letters, vol. 20, No. 21, Nov. 1, 1995, pp. 2195-2197.
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Satomi Sumiyoshi,Kokidochu Sekigal Fiber Laser, Japanese Journal of Optics, vol. 28, No. 8, 1999, pp. 449-454 (with partial English translation).

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