Rare-earth doped photon crystal optical fiber

Abstract

The invented optical fiber is formed through covering fiber core by first cladding, covering first cladding by second cladding, and covering second cladding by protection layer. Pores are possibly existed in center of the fiber core, between the fiber core and first cladding, in first cladding, and in second cladding. Fiber core is adulterated by rare earth ions. Comparing with traditional rare earth doping optical fiber, the first cladding of the invented optical fiber possesses larger numerical aperture. Thus, pump light is easier to be injected into first cladding so as to increase output power. The invention improves performances of optical fiber.

Description

technical field [0001] The invention relates to a rare earth-doped photonic crystal fiber for fiber laser and amplifier, in particular to the structure and manufacturing method of the fiber. Background technique [0002] Fiber lasers are one of the hotspots in the laser field in recent years, especially the 1.55μm wavelength fiber lasers applied to the optical fiber communication window and the high-power fiber lasers used in military and industrial processing are developing more rapidly. Technologies such as Q-switching and mode-locking of conventional lasers have also been introduced into fiber lasers, which not only broadens the research field of fiber lasers, but also promotes the development of laser technology. Under the same output power, fiber lasers have advantages in beam quality, optical transmission characteristics, reliability and volume. In addition, due to the reduction in fiber cost and the ease of streamlining and mass production, this has not only attracted...

AI Technical Summary

Problems solved by technology

[0009] In the preparation process of conventional double-clad rare earth-doped optical fiber, the most effective method is to use low-refractive-index coatings to increase the numerical aperture of the inner cladding, but the use of low-refractive-index coatings will affect the mechanical properties of the optical fiber. Adverse effects reduce the strength, and the use of low-refractive index coatings will greatly increase the difficulty and cost of the process. In addition, the contribution of low-refractive index coatings to the numerical aperture of the inner cladding is limited by the material itself, which will reduce the strength of the optical fiber.

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