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US5121460A High-power mode-selective optical fiber laser 失效
大功率模式选择光纤激光器

High-power mode-selective optical fiber laser
摘要:
An optical fiber includes a multimode primary core having an index or refraction N.sub.1 and doped with a material providing optical gain; the cladding surrounding the core having an index of refraction N.sub.2 ; and a secondary core doped with an absorbent material for providing optical loss in unwanted modes.
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