A single-frequency pulsed all-fiber laser based on self-phase modulation precompensation

A self-phase modulation and phase modulator technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problems of insufficient phase modulation depth, poor stability, complex system structure, etc. Single-frequency laser output, avoiding the effect of spectral broadening

Active Publication Date: 2018-10-23
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to pre-compensate the nonlinear phase shift caused by self-phase modulation in the single-frequency pulse fiber amplifier, and overcome the disadvantages of insufficient phase modulation depth, complex system structure, high cost, and poor stability in the prior art

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  • A single-frequency pulsed all-fiber laser based on self-phase modulation precompensation
  • A single-frequency pulsed all-fiber laser based on self-phase modulation precompensation
  • A single-frequency pulsed all-fiber laser based on self-phase modulation precompensation

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Embodiment Construction

[0038] see Figure 4 , Figure 4 It is a structural schematic diagram of a single-frequency pulse all-fiber laser based on self-phase modulation precompensation in the present invention. It can be seen from the figure that the composition of the single-frequency nanosecond pulse fiber Raman amplifier of the present invention includes a single-frequency continuous laser seed source (1), an intensity modulation system (2), a signal generator (3), and a 2×2 optical switch (4 ), energy transmission fiber (5), fiber pre-amplifier (6), phase modulator (7) and cascaded fiber amplifier (8). Among them, single-frequency continuous laser seed source (1), intensity modulation system (2), 2×2 optical switch (4), energy transmission fiber (5), fiber pre-amplifier (6), phase modulator (7) and stage The connected optical fiber amplifier (8) is connected into one by an optical fiber fusion splicer. The electrical signal output end of the signal generator (3) is connected with the electrica...

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Abstract

The invention relates to a single-frequency pulse full fiber laser device based on self-phase modulation precompensation. Under the situation that only one phase modulator is used, N+1 times of phase modulation is applied to a pulse laser. The nonlinear effect, caused by phase modulation, of the single-frequency pulse laser in the power amplification process is effectively compensated for, spectrum widening of the pulse laser is avoided, and single-frequency laser output with high peak power is achieved. The defects that in the prior art, the depth of phase modulation is not enough, and a system is complex in structure, high in cost and poor in stability are overcome. Multiple times of phase modulation of the pulse laser is achieved with single-phase modulation, the system structure is simplified, the system cost is reduced, and the system stability is improved.

Description

technical field [0001] The invention relates to a fiber laser, in particular to a single-frequency pulse all-fiber laser based on self-phase modulation precompensation. Background technique [0002] High-power single-frequency pulsed fiber lasers are widely required in the fields of remote sensing, nonlinear frequency conversion, and lidar. At present, the method of short-cavity Q-switching or intensity modulation is usually used to obtain low-power single-frequency pulse seed laser, and then the power is amplified through one or more stages of fiber amplifiers to obtain high laser power (see Document 1: CN103050874 A; Document 2: Su Rongtao et al. Single-frequency nanosecond pulsed all-fiber laser achieves 300W average power output. Intense Laser and Particle Beams, 2012, 24(5): 1009-1010; Literature 3: Rongtao Su et al. Kilowatt high-average power narrow- linewidth nanosecond all fiber laser. High Power LaserScience and Engineering, 2014, 2(1): 1-4). [0003] In fiber am...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/10
CPCH01S3/10007H01S3/10053H01S3/10092
Inventor 粟荣涛周朴张鹏飞王小林司磊许晓军陈金宝刘泽金
Owner NAT UNIV OF DEFENSE TECH
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