Negative dispersion pulse widening optical fiber amplifying device

A technology of optical fiber amplification and pulse stretching, which is applied in optics, nonlinear optics, instruments, etc., can solve the problems of complex optical fiber amplification system, large loss, and increased cost, and achieve the effects of improving coupling efficiency, reducing loss, and increasing pulse energy

Inactive Publication Date: 2010-09-22
PEKING UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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 basica

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  • Negative dispersion pulse widening optical fiber amplifying device
  • Negative dispersion pulse widening optical fiber amplifying device
  • Negative dispersion pulse widening optical fiber amplifying device

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Embodiment Construction

[0035] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] In fiber amplifiers, both ytterbium-doped fiber and erbium-doped fiber have positive dispersion and can compensate for negative chirp. Proper selection of negative dispersion can make the negative chirp of the pulse fully compensated in the positive dispersion fiber. The pulse is compressed during the amplification process, and the self-phase modulation caused by the short pulse will broaden the spectrum of the pulse; adjusting the negative dispersion before the amplifier can balance the self-phase modulation and shorten the pulse further.

[0037]The invention provides a chirped pulse amplifying fiber laser device with negative dispersion pulse broadening, and spe...

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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 the pulse 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...

Claims

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Application Information

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IPC IPC(8): G02F1/39
Inventor 李鹏王希周春蔡岳张志刚樊仲维麻云凤牛岗
Owner PEKING UNIV
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