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Full polarization maintaining fiber ultrashort pulse laser

A polarization-maintaining optical fiber and ultrashort pulse technology, applied in the laser field, can solve problems such as low damage threshold of saturable absorbers and SESAM Q-switched pulse damage, and achieve the effect of promoting self-starting process, increasing system complexity, and avoiding damage

Inactive Publication Date: 2021-06-04
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the saturable absorber damage threshold of general semiconductor materials is low, and SESAM is easily damaged by high-intensity Q-switching pulses during the Q-switching mode-locking stage in the early stage of mode-locking

Method used

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  • Full polarization maintaining fiber ultrashort pulse laser
  • Full polarization maintaining fiber ultrashort pulse laser
  • Full polarization maintaining fiber ultrashort pulse laser

Examples

Experimental program
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Effect test

example 2

[0043] In Example 2, a filter with a bandwidth of 0.5nm is used, and its center wavelength is 1064nm. The spectrum obtained in the example experiment is as follows Figure 4 and Figure 5 shown, where Figure 5 It is the spectrum when the output terminal is not connected to the amplification stage, the full width at half maximum of the spectrum is about 0.3nm, and the 10dB bandwidth is about 1.1nm. The 49.6MHz pulse is output under the pump power of 150mW, and the average power reaches 10.54mW. Image 6 It is the spectrum when the output terminal is connected to the amplification stage. The half-height of the spectrum is about 3nm, the 10dB bandwidth is about 4nm, and the conversion limit pulse width corresponding to the 3dB bandwidth is about 500fs. After self-similar amplification, the spectral width can be further broadened, and pulses of the order of 100 fs can be output.

[0044] The structure of the third embodiment of the present invention is the same as that of the ...

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Abstract

The invention discloses a full polarization maintaining fiber ultrashort pulse laser. The pulse laser comprises a non-linear amplification loop mirror with an asymmetric splitting ratio, so that pulses in the loop have different phase shifts so as to output high-power ultrashort pulses; a linear arm part which consists of a saturable absorber and is used for forming a complete resonant cavity and improving the self-mode-locking characteristic of the laser; and an output end used for directly outputting a pulse or pre-amplifying a laser pulse, so that the laser outputs an ultrashort pulse with higher power, or broadening a spectrum through pre-amplification to obtain a narrower pulse width. The pulse laser adopts an all-polarization-maintaining structure, does not introduce a space adjusting element, is good in mode locking self-starting characteristic, is not liable to damage the saturable absorber, has the characteristics of small size and high stability, and has the potential to be developed into a new generation of all-fiber ultra-short laser oscillators with excellent performance.

Description

technical field [0001] The invention belongs to the field of laser technology, and more specifically relates to an all-polarization-maintaining fiber ultrashort pulse laser. Background technique [0002] Ultrafast lasers are widely used in material processing, biomedical imaging, microspectroscopy and other fields due to their advantages of extremely short time scale and high peak power. Due to the limitation of the damage threshold of the laser device, the peak power of the laser pulse is limited, so the single pulse energy of the picosecond laser pulse is often much higher than that of the femtosecond laser. Industrial applications such as picosecond lasers are more efficient than femtosecond lasers. On the other hand, the amplification of the picosecond laser does not require steps such as stretching and compression, so the structure of the picosecond laser is simpler and the cost is lower than that of the femtosecond laser. Therefore, the market for picosecond lasers in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/094H01S3/11
CPCH01S3/067H01S3/094076H01S3/1106
Inventor 胡凯淋刘志弘颜及堃陈瑜刘少臻郭子悦曹涛彭家晖
Owner HUAZHONG UNIV OF SCI & TECH