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Pulse-width-tunable gain-switch type picosecond pulse seed source

A technology of gain switch and picosecond pulse, which is applied in the field of gain switch type picosecond pulse seed source, can solve the problems of non-adjustable repetition frequency and pulse width, limited application range, fixed and non-adjustable picosecond pulse, etc., and achieves easy industrial processing and the effects of scientific research

Inactive Publication Date: 2011-11-16
WUHAN YANGTZE SOTON LASER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem of this technology is: the generated picosecond pulse is fixed and cannot be adjusted, specifically, its repetition frequency and pulse width cannot be adjusted; and it is difficult to output a pulse with a repetition frequency higher than 100MHz and a pulse width of more than 200ps by using the mode-locking technology. Light pulses, which limit the flexibility and controllability of this technology in applications
However, this method is currently generally used in communication systems, and its working wavelength is usually around 1.5 μm, and the pulse repetition frequency is generally above GHz; moreover, the final output is unpolarized light, and the pulse width cannot be adjusted, so the application range of this method also subject to many restrictions

Method used

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  • Pulse-width-tunable gain-switch type picosecond pulse seed source
  • Pulse-width-tunable gain-switch type picosecond pulse seed source
  • Pulse-width-tunable gain-switch type picosecond pulse seed source

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Embodiment 1

[0022] Such as figure 1 As shown, a gain-switched picosecond pulse seed source with adjustable pulse width of the present invention is composed of a gain-switched laser 1, a fiber coupler 7, a single longitudinal mode locking device and a chirp compensation module 9, and the fiber coupler 7 It is respectively connected with the gain switch laser 1, the single longitudinal mode locking device, and the chirp compensation module 9 through polarization-maintaining optical fibers.

[0023] The gain-switched laser 1 is composed of an electric pulse generator 2, a signal amplifier 3, a DC bias current source and a 1060nm F-P semiconductor laser 6 connected in sequence. The electric pulse generator 2 generates a radio frequency signal with adjustable repetition frequency, and the repetition frequency adjustment range is 10K ~ 100MHz. By adjusting the DC power supply 5 to change the DC bias 4, so that the F-P semiconductor laser 6 is below the threshold, the radio frequency signal pass...

Embodiment 2

[0030] Other structures of this embodiment are the same as those of Embodiment 1, except that the single longitudinal mode locking device of this embodiment is a 1060 nm DFB semiconductor laser 11 . At this time, the longitudinal mode is always in a locked state, and the repetition frequency of the electrical pulse generator 2 can be adjusted arbitrarily to adjust the repetition frequency of the output optical pulse.

Embodiment 3

[0032] Other structures of this embodiment are the same as those of Embodiment 1, except that this embodiment has no single longitudinal mode locking device, and the output end of the gain-switched laser 1 is directly connected to the chirp compensation module 9 through a polarization-maintaining fiber. Since there is no single longitudinal mode locking device, this embodiment can output multi-longitudinal mode laser light at any repetition frequency.

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Abstract

The invention discloses a pulse-width-tunable gain-switch type picosecond pulse seed source, relating to a pulse type fiber laser device and comprising a gain-switch laser device. The pulse width-tunable gain-switch type picosecond pulse seed source is specially characterized in that the gain-switch laser device is connected with a chirp compensation module used for tuning the pulse width at a special position of a signal output by the gain-switch laser device. Further, the gain-switch laser device and the chirp compensation module are connected by a polarization maintaining fiber. Compared with the prior art, due to the arrangement of the gain-switch laser device and the chirp compensation module, the gain-switch type pulse source is internationally used for the first time in the wave band of 1030-1070 nm to generate picosecond pulses; the pulse repetition frequency can be tuned flexibly in the range of 10k-100MHz, the pulse width of basic laser is tunable in the range of 50-500ps; moreover, after the adoption of the polarization maintaining fiber, all the output seed lasers are linear polarization single-longitudinal-mode lasers or multi-longitudinal-mode lasers and are easy for industrial processing and scientific research.

Description

technical field [0001] The invention relates to a pulse type fiber laser, in particular to a gain switch type picosecond pulse seed source with adjustable pulse width. Background technique [0002] Pulsed fiber laser has become a new generation of laser products replacing traditional solid and gas lasers due to its small size, good beam quality, high peak power, and low energy consumption. It is an important laser for industrial laser processing and scientific research. Short-pulse picosecond seed source lasers are now widely used in pulsed fiber lasers. For example, fiber lasers based on the main oscillation power amplification (MOPA) structure are designed to obtain high-performance pulsed laser output by amplifying the seed source laser. It can be seen that the quality of the seed source will directly affect the performance of the final output laser. [0003] At present, the generation of picosecond ultrashort pulses generally adopts mode-locking technology or gain switc...

Claims

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Application Information

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IPC IPC(8): H01S3/11H01S3/101
Inventor 陈抗抗
Owner WUHAN YANGTZE SOTON LASER CO LTD
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