L-band high-power fiber laser based on gain competition and same-band pumping

Abstract

The invention provides an L-band high-power fiber laser based on gain competition and same-band pumping. The described laser structure includes: a L-band laser seed source, a preamplifier stage fiberamplifier, an optical isolator, a power amplifier stage fiber amplifier, a wavelength division multiplexer, an auxiliary pump laser and a fiber collimator. The invention utilizes the gain competitionrelationship between the C (S) band laser and the L band laser in the doped gain optical fiber to realize the power amplification of the C (S) band laser firstly. When the C (S)-band laser power reaches a certain value in the doped gain fiber, the energy transfer from C (S)-band to L-band laser is realized by the same-band pump. When the gain fiber length is appropriate, most of the C (S) band laser energy will be absorbed, and ultimately achieve high conversion efficiency, high power L-band fiber laser output.

Description

technical field [0001] The invention belongs to the technical field of fiber lasers, and in particular relates to a high-conversion-efficiency, L-band, high-power fiber laser based on gain competition and same-band pumping. Background technique [0002] L-band fiber lasers have important application value in wind lidar, differential absorption lidar, space optical communication, and optical parametric oscillator pumping source. On the other hand, the L-band fiber laser is often used as the pump source of the 2.0μm-band laser resonator. Through the same-band pumping method, the resonator can directly output high-power 2.0μm-band laser. [0003] In order to achieve high power output of fiber lasers, the common method is the main oscillation power amplification technology solution (MOPA), that is, through the cascade connection of multi-stage pre-amplification level fiber amplifiers and power amplifier level fiber amplifiers, the signal light output power is continuously increa...

AI Technical Summary

Problems solved by technology

However, the above-mentioned patents all absorb spontaneous radiation in the gain fiber, and cannot effectively control the wavelength range and power of the spontaneous radiation; and do not consider the use of erbium-ytterbium co-doped double-clad gain fiber, so the power and efficiency are affected by the gain fiber or pump way restrictions

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