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Mode-locked fiber laser based on self-phase modulation

A fiber laser and self-phase modulation technology, applied in the field of ultrafast optics, can solve problems such as difficulty in obtaining high-power and wide-spectrum laser pulses, difficulty in obtaining wide-spectrum laser light sources, low laser damage threshold, etc., and achieve good environmental stability performance, simple structure, and the effect of improving single pulse energy

Inactive Publication Date: 2020-09-29
EAST CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For saturable absorbers, the laser damage threshold is too low and the bandwidth is narrow, so it is difficult to obtain high-power and wide-spectrum laser pulses based on saturable absorber mode-locking; while for nonlinear polarization evolution mode-locking and nonlinear loop mirror mode-locking Although it is possible to reduce the nonlinearity and increase the output power by replacing the fiber with a fiber with a large mode field area, it is difficult to obtain a wide-spectrum laser source due to the limitation of the bandwidth of the fiber device and the narrowing of the gain.

Method used

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  • Mode-locked fiber laser based on self-phase modulation
  • Mode-locked fiber laser based on self-phase modulation
  • Mode-locked fiber laser based on self-phase modulation

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Embodiment 1

[0022] Such as figure 2 As shown, the mode-locked fiber laser based on self-phase modulation in this embodiment includes a first wavelength division multiplexer 11 arranged as a ring cavity, a first gain fiber 13, a long-wavelength bandpass filter 21, a second wave Division multiplexer 31, the second gain fiber 33, short-wavelength bandpass filter 22, fiber coupler 5 and fiber isolator 4, also include the first semiconductor laser 12 connected with the first wavelength division multiplexer 11 and The second semiconductor laser 32 connected to the second wavelength division multiplexer 31. The first semiconductor laser 12 sends laser pulses, and the first wavelength division multiplexer 11 couples the laser pulses into the first gain fiber 13, thereby broadening the spectrum while providing gain for the laser pulses. After the spectral filtering, the second wavelength division multiplexer 31, the second semiconductor laser 32, and the second gain fiber 33 amplify the laser pu...

Embodiment 2

[0024] Such as image 3 As shown, the mode-locked fiber laser based on self-phase modulation in this embodiment includes a first fiber mirror 23, a long-wavelength bandpass filter 21, a first wavelength division multiplexer 11, and a first gain fiber arranged in sequence. 13. The short-wavelength bandpass filter 22 and the second fiber mirror 34 also include a first semiconductor laser 12 connected to the first wavelength division multiplexer 11, and the mode-locked fiber laser has a linear cavity inside. The first semiconductor laser 12 emits pulsed laser light, and the first wavelength division multiplexer 11 couples the pulsed laser light into the first gain fiber 13 to provide gain for the laser pulse while broadening the spectrum, and the long-wavelength bandpass filter 21 pairs the widened Spectral filtering, the first fiber mirror 23 reflects the laser pulse back into the linear cavity, the laser pulse is amplified again in the first gain fiber 13 and the spectrum is br...

Embodiment 3

[0026] Such as Figure 4 As shown, the mode-locked fiber laser based on self-phase modulation in this embodiment includes a first fiber mirror 23, a bandpass filter 2, a first wavelength division multiplexer 11, a first gain fiber 13 and a first The second fiber mirror 34 also includes a first semiconductor laser 12 connected to the first wavelength division multiplexer 11 . The interior of the mode-locked fiber laser is a linear cavity. The maximum gain point of the first gain fiber 13 and the bandpass filter 21 have different central wavelengths. In this embodiment, the band-pass filter 2 is a single-chip band-pass filter. The laser pulse emitted by the first semiconductor laser 12 is coupled into the first gain fiber 13 through the first wavelength division multiplexer 11 to amplify and broaden the spectrum at the same time, and then pass through a bandpass filter to filter the broadened spectrum, and the first optical fiber reflects The mirror 23 reflects the laser puls...

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Abstract

The invention discloses a mode-locked fiber laser based on self-phase modulation. The mode-locked fiber laser comprises a wavelength division multiplexer, a semiconductor laser, a gain fiber and a band-pass filter. Laser pulses emitted by the semiconductor laser are coupled into the gain optical fiber through the wavelength division multiplexer. The spectrum is broadened nonlinearly under the action of self-phase modulation, the width of the laser pulse is in positive correlation with the broadened spectrum, the spectrum broadening reaches the filtering range of an optical filter in the band-pass filter so as to improve the transmittance of the optical filter to the spectrum, and a saturable absorption mechanism is formed so as to realize mode locking. The mode-locked fiber laser has the advantages that the structure of the fiber laser is simplified, the monopulse energy of the laser is improved, the spectral width of pulses is increased, the pulse width of the pulses is reduced, and the peak power of the pulses is improved.

Description

technical field [0001] The invention belongs to the technical field of ultrafast optics, and in particular relates to a mode-locked fiber laser based on self-phase modulation. Background technique [0002] Fiber lasers can be used as a substitute for traditional solid-state lasers, with the advantages of simplicity, stability and low cost. In recent decades, the rapid development of femtosecond fiber lasers has brought about revolutionary changes and is widely used in spectroscopy, metrology , medicine, biology and industry. For femtosecond laser researchers, how to increase the peak power of optical pulses has always been a research direction. The peak power of the laser pulse is related to the single pulse energy and pulse width. If the single pulse energy is high and the pulse width is narrow, then the peak power of the pulse will be high, and the pulse width is related to the spectrum. Therefore, we need to increase the output power of the mode-locked laser and broaden ...

Claims

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Application Information

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IPC IPC(8): H01S3/067H01S3/11H01S3/16
CPCH01S3/06708H01S3/1106H01S3/163
Inventor 周廉李文雪刘洋罗大平顾澄琳
Owner EAST CHINA NORMAL UNIVERSITY
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