Two key frontier issues on picosecond pulses generated by mode-locked fiber lasers

Lu Qiao; Mao qinghe

doi:10.11884/HPLPB202032.200210

Volume 32 Issue 12

Nov. 2020

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Article Navigation > High Power Laser and Particle Beams > 2020 > 32(12): 121005

Lu Qiao, Mao qinghe. Two key frontier issues on picosecond pulses generated by mode-locked fiber lasers[J]. High Power Laser and Particle Beams, 2020, 32: 121005. doi: 10.11884/HPLPB202032.200210

Citation:

Lu Qiao, Mao qinghe. Two key frontier issues on picosecond pulses generated by mode-locked fiber lasers[J]. High Power Laser and Particle Beams, 2020, 32: 121005. doi: 10.11884/HPLPB202032.200210

Lu Qiao, Mao qinghe. Two key frontier issues on picosecond pulses generated by mode-locked fiber lasers[J]. High Power Laser and Particle Beams, 2020, 32: 121005. doi: 10.11884/HPLPB202032.200210

Citation:

Lu Qiao, Mao qinghe. Two key frontier issues on picosecond pulses generated by mode-locked fiber lasers[J]. High Power Laser and Particle Beams, 2020, 32: 121005. doi: 10.11884/HPLPB202032.200210

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Two key frontier issues on picosecond pulses generated by mode-locked fiber lasers

doi: 10.11884/HPLPB202032.200210

Lu Qiao^1
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Mao qinghe^{1, 2
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1.
Anhui Provincial Key Laboratory of Photonics Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230026
2.
School of Environmental Science and Optoelectronic Technology,University of Science and Technology of China, Hefei 230026

Received Date: 2020-07-20
Rev Recd Date: 2020-09-27
Publish Date: 2020-11-19

Abstract

Abstract

Narrowband dissipative soliton mode-locked fiber lasers can produce transform-limited picosecond pulses. Unfortunately, due to the limitation of allowable nonlinear phase shift for the intracavity pulse, the repetition rate of the pulses generated by such lasers cannot be reduced by increasing the cavity length; the pulse energy is only below 0.1 nJ. These seriously restrict the practical application of such picosecond pulsed fiber lasers. In this paper, we propose a method that allows the cavity length to be increased to reduce the repetition rate of the narrowband dissipative soliton picosecond fiber laser pulses by extracting the pulse energy out of the cavity with a coupler to suppress the accumulation of nonlinear phase shift of the intracavity pulses. Using this method, the laser repetition rate was successfully reduced from 35.2 MHz to 1.77 MHz, and the pulse time-frequency characteristics remained unchanged. We also propose a method to suppress spectral broadening in picosecond pulse fiber amplification based on inter-stage FBG notch filtering. By simply using the inter-stage notch filter, the output pulse spectrum width after the first-stage fiber amplifier can be narrowed, allowing the second-stage fiber amplifier to further increase the pulse energy, and also, the pulse can be reshaped to be nearly Gaussian-shaped, allowing the second-stage fiber amplifier to increase the pulse energy higher by using the Gaussian pulse characteristics of the smaller spectral broadening slope. Using this method, on the premise of keeping the RMS spectral width within 0.4 nm, after a 10 ps pulse passes through a standard single-mode fiber amplifier, the pulse energy can be increased from 0.2 nJ to more than 10 nJ.
- piscosecond pulse,
- mode-locked fiber laser,
- picosecond pulse fiber amplifier,
- repetition rate,
- pulse energy,
- nonlinear phase shift

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References(57)

References

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