Dual wavelength pulse optical fiber laser system

Abstract

The dual-wavelength pulse fiber laser system comprises: a segment of dual-cladded fiber of large module area codoped with Er and Yb and with output end thermo-welded a hollow fiber cap with given polished angle, a pumping source composed by multiple laser diodes with tail fiber output to couple the pumping light into the inner envelope of former fiber output end by a pumping coupler, two seed light beams from the first and second source arranged vertically to be composed into one beam by a 45Deg dichroic mirror and coupled into former fiber core by an optical coupling system, and the first and second optical isolators arranged between the first seed source, dichroic mirror and the second source respectively. This invention has compact structure and high efficiency.

Description

technical field [0001] The invention relates to a fiber laser, in particular to a dual-wavelength pulse fiber laser system. Background technique [0002] Multi-wavelength fiber lasers play an important role in fiber optic sensing, spectral analysis, and dense wavelength division multiplexing fiber optic communication systems. In the prior art, the seed pulse main oscillation amplification technology is adopted, and the gain medium is an erbium-ytterbium co-doped large-mode-area double-clad fiber. After two stages of amplification, the cladding-pumped erbium-ytterbium co-doped fiber amplifier achieves a wavelength of 1563nm. 87W single-frequency amplified laser output. See the prior art [Electron.Lett.39:1717-1719, 2003], but the optical path is relatively complicated, the stability of the whole system is not high, and it is difficult to realize. To increase the output power of pulsed fiber lasers or amplifiers, the key lies in how to efficiently couple the pumping light an...

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Problems solved by technology

Since an optical fiber has only two end faces, the high-power semiconductor pumping laser enters the inner cladding from the end face, which is likely to cause thermal damage to the end face, which limits the increase in the power of the pump light entering the inner cladding, thereby limiting the fiber laser. Further increase in output power

The simultaneous entry of pump light and seed light by using a dichromatic chip, see the prior art [CLEO2002, 591-592], has high requirements for a dichromatic chip that achieves high reflection of seed light and high transmittance of pump light, and must be realized at the same time The seed light enters the fiber core and the pump light enters the inner cladding, which is technically difficult

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