A compact all-fiber sub-hundred femtosecond ultrashort pulse generator

Abstract

The invention discloses an all-optical-fiber sub-hundred-femtosecond ultrashort pulse generation apparatus with a compact structure. The apparatus comprises a dissipation soliton oscillator, an output isolation part, a pre-compression part and an amplifying and nonlinear compression part which are connected in sequence through mono-mode optical fibers; negative dispersion is introduced to the pre-compression part; the negative chirp quantity provided by the pre-compression part is less than the positive chirp quantity of input pulse; the dissipation soliton oscillator generates pulse with relatively high energy and positive chirp, and the pulse enters the pre-compression part through the output isolation part to compress the pulse width and improve the pulse peak power, and finally, the pulse energy in the amplifying and nonlinear compression part is improved; and the pulse spectrum is widened and the pulse width is compressed through the nonlinear process to obtain the sub-hundred-femtosecond ultrashort pulse. The apparatus has the all-optical-fibre structure and relatively high resistance to external environment disturbance based on a dissipation soliton optical fibre laser in a single-wall carbon nanotube locking mode and can stably output sub-hundred-femtosecond pulse for a long time.

Description

technical field [0001] The invention relates to the field of fiber laser technology, in particular to a compact all-fiber sub-hundred femtosecond ultrashort pulse generating device. Background technique [0002] Ultrashort optical pulses are widely used in ultrafast optical diagnosis, optical precision measurement, precision machining, laser medical treatment and bioengineering, and are also frontier topics in nonlinear optics and ultrafast optics. Among them, sub-hundred femtosecond ultrashort pulses have the characteristics of extremely narrow pulse width, ultra-wide spectrum, and extremely high peak power, and are widely used in research fields such as optical frequency combs, molecular transient dynamics, and nonlinear optics. . The currently commonly used sub-hundred femtosecond ultrashort pulse laser sources are based on Ti:Sapphire solid-state lasers, which are helpful for the generation of hundreds of femtosecond pulses thanks to their ultra-wide gain bandwidth and ...

AI Technical Summary

Problems solved by technology

However, there are several problems in this solution: First, when the dispersion of the laser resonator is close to zero, the high-order dispersion in the laser will have a significant effect on the pulse evolution, and the resonator is more sensitive to the disturbance of the external environment, which is not conducive to The laser works stably for a long time; secondly, limited by the nonlinear effect in the fiber resonator, the pulse energy of the stretched pulse is generally below 1nJ, and the average power does not exceed 1mW, which greatly limits the application range of the laser, and in the follow-up In the amplification device, the small power level will also have an adverse effect on the signal-to-noise ratio of the output pulse; there is also the limitation of mode-locking technology for sub-hundred femtosecond ultrashort pulse fiber lasers, and the nonlinear polarization usually used in the laboratory Rotation technology and nonlinear optical loop mirror technology cannot meet the requirements of laser self-start and anti-interference. Semiconductor saturable absorber mirrors can realize self-start of mode-locked fiber lasers, but there are many limitations in price, damage threshold and working bandwidth.

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