Negative dispersion pulse widening optical fiber amplifying device

Abstract

The invention discloses a negative dispersion pulse widening optical fiber amplifying device, which comprises a mode-locked laser, a negative dispersion unit, a primary amplifying unit, a secondary amplifying unit and an output unit, wherein the mode-locked laser generates seed light pulse; the negative dispersion unit is arranged at the emergent side of the seed light pulse of the mode-locked laser to widen the seed light pulse and enable the seed light pulse to have negative chirp; the primary amplifying unit receives the seed light pulse with the negative chirp, which is output by the negative dispersion unit, carries out primary amplification, and further carries out positive dispersion compensation on the negative chirp in the seed light pulse to shorten the seed light pulse; the secondary amplifying unit receives the seed light pulse output by the primary amplifying unit, carries out secondary amplification, and further carries out positive dispersion compensation on the negative chirp in the seed light pulse to shorten the seed light pulse; and the output unit is connected with the secondary amplifying unit and outputs the amplified seed light pulse. The invention makes thepulse of the output end of the optical fiber amplifier shortest via the negative dispersion widening, simplifies the system, reduces the loss, increases the pulse energy after the amplifier, and effectively reduces the cost.

Description

technical field [0001] The invention belongs to the field of optical fiber amplifiers, and relates to a high repetition frequency femtosecond pulse mode-locked fiber laser amplifier device, in particular to the design of pulse stretching, using a grating pair or a prism pair to carry out negative chirp stretching of the pulse, in the amplifier fiber While continuously gaining energy, the pulse is gradually shortened, so as to obtain the shortest pulse output at the end of the fiber amplifier. Background technique [0002] Conventional fiber laser amplifiers are based on the principle of chirped pulse amplification, which uses positive dispersion elements or optical fibers to broaden the pulse, and then compresses it with negative dispersion elements after amplification. Commonly used negative dispersion elements are grating pairs, prism pairs, or combinations of grating-prism pairs. The disadvantage of grating compressed pulses is that grating pairs usually have a large loss...

AI Technical Summary

Problems solved by technology

[0007] The fiber optic pulse amplification technologies disclosed above all adopt positive dispersion broadening amplification and negative dispersion compression technology, adopt a spatial output mode, and the pulse width is basically the same as or slightly wider than the incident seed light. Larger, which reduces the pulse energy after the amplifier and increases the cost, so the optical fiber pulse amplification technology needs to be continuously improved

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