Active optical fiber with photon darkening resistance and preparation method thereof

Abstract

The invention provides an active optical fiber with photon darkening resistance. Silicon dioxide is used as matrix for a fiber core of the active optical fiber which comprises at least one type of active ions and a codoping agent, wherein the active ions are rare earth ions with the atomic number of 57-71; and the codoping agent contains aluminum, yttrium and cerium ions. The invention also provides a preparation method of the active optical fiber with the photon darkening resistance, comprising the following steps of: firstly carrying out polishing treatment on a pure quartz reaction tube; depositing an envelope layer and a core layer, and then soaking in a hydrochloric acid-alcohol mixed solution of the active ions and the cerium and yttrium ions; drying after soaking; vitrifying the pure quartz reaction tube to prepare an optical fiber preformed rod; and finally drawing the prepared optical fiber preformed rod to prepare the active optical fiber. The active optical fiber is greatly enhanced in photon darkening resistant property; and in addition, an optical fiber laser prepared by using the active optical fiber has the slope efficiency kept more than 80 percent and has higher stability and longer service life.

Description

technical field

[0001] The invention relates to an active optical fiber and a preparation method thereof, in particular to an active optical fiber capable of improving anti-photon darkening performance and a preparation method thereof. Background technique

[0002] High-power fiber laser is an all-solid-state laser device that uses rare earth-doped double-clad fiber as the working medium and semiconductor laser as the pump source. Since Snitzer et al. proposed a double-clad laser fiber in 1988, fiber lasers and amplifiers based on cladding pumping technology have developed rapidly. Especially in recent years, with the development of optical fiber preparation technology and semiconductor lasers, fiber lasers have developed rapidly. In 2005, the United States, the United Kingdom, Germany and Japan respectively achieved a single-fiber output power exceeding the kW level. In 2009, the single-fiber output of IPG photonics in the United States reached the order of 10,000 watts, ...

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