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Multi-pass ultra-short pulse laser amplifier based on mono-crystalline fiber polarization control

An ultrashort pulse laser and polarization control technology, applied in the laser field, can solve problems such as the inability to effectively guarantee the quality of the output beam, wavelength shift, nonlinear effects, etc., and achieve the effect of high power and high energy ultrashort pulse laser output

Pending Publication Date: 2018-05-15
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in ultrafast laser amplification, due to the limitation of the finite mode field area of ​​the fiber, when the ultrashort laser pulse is transmitted in the fiber, serious nonlinear effects will occur, resulting in time-domain distortion of the pulse, wavelength shift, etc., so in It is usually difficult to achieve high-energy ultrashort pulse output in optical fibers
The solid-state laser has a large mode field area, small nonlinear effects, and can output high pulse energy and peak power. However, in the process of high-power amplification, because the solid-state amplification medium is easily affected by thermal effects, the quality of the output beam cannot be effectively guaranteed. , and the amplification gain is relatively low, usually by means of regenerative amplification or complex multi-pass amplification, with complex structure and poor stability

Method used

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  • Multi-pass ultra-short pulse laser amplifier based on mono-crystalline fiber polarization control
  • Multi-pass ultra-short pulse laser amplifier based on mono-crystalline fiber polarization control

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Embodiment 1

[0021] see figure 1 , this embodiment is a multi-pass ultrashort pulse laser amplifier based on single crystal fiber polarization control, specifically a two-pass amplifier, its structure includes a signal light adjustment unit 1, a single crystal fiber 2, a polarization rotation unit 3, a two-color The front end of the mirror unit 4 and the pump light adjustment unit 5; the signal light adjustment unit 1 is provided with a signal light direction control unit 6.

[0022] The signal light in this embodiment is linearly polarized light with a center wavelength of 1030 nm, a power of 600 mW, and a repetition frequency of 200 kHz. It should be noted that this group of parameters is only the parameters selected in this embodiment. In other occasions, depending on the doping of the crystal, the wavelength can also be other wavelengths, and the power and repetition frequency can also be selected according to different applications.

[0023] The linearly polarized light enters the fi...

Embodiment 2

[0035] see figure 2 , this embodiment provides another multi-pass ultrashort pulse laser amplifier based on single crystal fiber polarization control, specifically a four-pass amplifier. The characteristic of this embodiment is that on the basis of the amplifier structure of Embodiment 1, a signal light secondary adjustment unit 7 is added between the signal light adjustment unit 1 and the single crystal fiber 2, and the signal light secondary adjustment unit 7 includes a 45° optical rotator 71 , the second half-wave plate 72 and the second polarization beam splitter prism 73, the reflected light direction of the second polarization beam splitter prism 73 is provided with the second signal light focusing lens 74 and the second signal light reflector 75 in sequence; by the signal light adjustment unit 1 The outgoing signal light passes through the 45° optical rotator, the second half-wave plate 72 and the second polarization splitter prism 73 in sequence, and then enters the f...

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Abstract

The invention belongs to the technical field of laser, and particularly relates to a multi-pass ultra-short pulse laser amplifier based on mono-crystalline fiber polarization control. The amplifier includes a signal light adjusting unit, a mono-crystalline fiber, a polarization rotation unit, a dichroic mirror unit and a pump light adjusting unit. Linearly polarized light passes through the signallight adjusting unit and enters a first end face of the mono-crystalline fiber, signal light emitted from a second end face of the mono-crystalline fiber is reflected by the dichroic mirror unit andenters the polarization rotation unit, and signal light emitted from the polarization rotation unit is reflected by the dichroic mirror unit along the original light path and enters the second end face of the mono-crystalline fiber. Pump light emitted by the pump light adjusting unit is transmitted by the dichroic mirror unit and enters the second end face of the mono-crystalline fiber. Through polarization control on ultra-short pulse laser, amplified laser can pass through a novel amplification medium (the mono-crystalline fiber) multiple times to extract the energy stored in a gain medium.Therefore, high-power and high-energy ultra-short pulse laser output is realized.

Description

technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to a multi-pass ultrashort pulse laser amplifier based on single-crystal fiber polarization control. Background technique [0002] High-power and high-energy femtosecond laser has the advantages of narrow pulse width and high peak power, and has a wide range of applications in ultra-fine micromachining, microphotonic device manufacturing, ultrafast nonlinear optics, terahertz generation, nanobiological engineering, and national defense laser weapons. Applications, ultrashort pulse lasers with high power and high energy have always been the focus of research. At present, in the process of ultrafast laser amplification, typical amplification methods include fiber laser amplification and solid-state laser amplification, but these two different ultrashort pulse amplifiers have their own advantages and disadvantages. Fiber amplifiers have been extensively studied due to their...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/10H01S3/067
CPCH01S3/06708H01S3/10061
Inventor 李峰杨直王屹山吕志国李强龙杨小君魏玉凤张雷唐书奎赵卫
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI