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Device for performing synchronous focusing shaping on distorted femtosecond laser pulse and control method

A pulse-synchronized, femtosecond laser technology, applied in lasers, laser components, optics, etc., can solve problems such as inability to control space distortion and time distortion focus shaping

Inactive Publication Date: 2019-07-23
HARBIN INST OF TECH AT WEIHAI
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Problems solved by technology

It only indirectly controls the time dimension of the femtosecond laser pulse, and cannot simultaneously control the focus and shape of the spatial distortion and time distortion.

Method used

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  • Device for performing synchronous focusing shaping on distorted femtosecond laser pulse and control method
  • Device for performing synchronous focusing shaping on distorted femtosecond laser pulse and control method
  • Device for performing synchronous focusing shaping on distorted femtosecond laser pulse and control method

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with accompanying drawing:

[0033] The light beam output by the laser 1 enters the beam splitter 2 and is divided into two parts, one part enters the sample optical path 3.1-8, and the other part enters the reference optical path 3.2-8.

[0034] In the sample optical path 3.1-8, the light beam is reflected by the first mirror 3.1 and then enters the pulse shaper 4. The laser beam emitted by the pulse shaper 4 is focused on the sample 7 through the first converging lens 5.1, and the sample 7 is fixed on the movable On the two-dimensional platform 6.1, the two-dimensional platform 6.1 can move in a direction perpendicular to the optical axis of the first converging lens 5.1. The scattering sample 7 destroys the temporal integrity of the femtosecond laser pulse, which is no longer a complete pulse in time, and the laser pulse becomes a complex space-time speckle. The scattered light emitted through the s...

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Abstract

The invention relates to a method for performing focusing shaping control on a distorted femtosecond laser pulse. The method is characterized in that an optical inverse diffusion algorithm is writtenaccording to a time inversion principle; a phase shift holographic algorithm is written according to a holographic interference principle; light beams output from a laser 1 are incident on a beam splitter 2 and are divided into two parts, one part entering a sample light path 3.1-8 and the other part entering a reference light path 3.2-8. The light beams in the reference light path 3.2-8 are reflected onto an isosceles prism 10 by a second mirror 3.2 and a third mirror 3.3, the light beams are reflected to a fourth mirror 3.4 by the isosceles prism 10, and the light beams are reflected by thefourth mirror 3.4 and then input to a two-dimensional spectrometer 8. According to the method in the invention, the spatial freedom of the wave-front in a spatial light modulator is controlled by running the optical inverse diffusion algorithm through a computer, thereby realizing simultaneous focusing shaping control on the spatial distortion and time distortion of the femtosecond laser pulse.

Description

technical field [0001] The invention relates to a method for focusing and shaping control on distorted femtosecond laser pulses, in particular to a device and control method for synchronous focusing and shaping of distorted femtosecond laser pulses. Background technique [0002] On the femtosecond time scale, the interaction between matter and laser is particularly dependent on the spatial and temporal shape distribution of the femtosecond laser pulse used, which requires that the femtosecond laser pulse used can maintain the initial space- Time to focus on shapes. However, due to the wide spectral characteristics of femtosecond laser pulses, when femtosecond laser pulses propagate in the medium, the spatial distribution and temporal characteristics of the pulses will be distorted, causing distortions such as temporal chirp, spatial chirp, and pulse front tilt. When this distortion effect is present, it affects the temporal resolution of femtosecond laser pulses, reduces th...

Claims

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Application Information

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IPC IPC(8): H01S3/00G02B27/09
CPCG02B27/0927G02B27/0955G02B27/0977H01S3/0057H01S3/0071
Inventor 刘文军孙正和郑小春任守田刘立宝田兆硕
Owner HARBIN INST OF TECH AT WEIHAI
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