In order to raise the couple efficiency of pumping double claddingfiber laser, the beam is reshaped with rectangular prisms, spatial filtered and focused with aspheric lens.
A new refractive index sensing scheme based on the cladding modes offiber Bragg grating (FBG) is presented.
提出了基于光纤布拉格光栅(FBG)包层模式的折射率传感方案。
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In order to improve radiation resistivity, the elements with smaller atomic number should be selected as dopants in both core and claddingof the fiber.