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Compensation device and compensation method for pulse front distortion in femtosecond laser pulse amplification system

A pulse front, pulse amplification technology, applied in lasers, laser parts, optics, etc., can solve the problems of pulse time width broadening, focus pulse peak intensity drop, etc., to achieve the effect of simple design method and strong practicability

Active Publication Date: 2018-07-13
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The distortion of the front edge of the pulse will make the time of light rays at different spatial positions reach the focal area different when the laser pulse is focused, which will cause the pulse time width of the focal area to widen, resulting in a decrease in the peak intensity of the real focused pulse

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  • Compensation device and compensation method for pulse front distortion in femtosecond laser pulse amplification system
  • Compensation device and compensation method for pulse front distortion in femtosecond laser pulse amplification system
  • Compensation device and compensation method for pulse front distortion in femtosecond laser pulse amplification system

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Embodiment

[0025] Figure 4 It is a structural schematic diagram of an embodiment of the femtosecond laser pulse amplification system of the present invention. Depend on Figure 4 It can be seen that the femtosecond laser pulse amplification system includes an oscillator 1, a stretcher 2, a regenerative amplifier 3, a lens beam expander 4, a preamplifier 5, a lens beam expander 6, a power amplifier 7, and a pulse front distortion compensation device, Terminal amplifier 10, lens beam expander 11 and compressor 12.

[0026] In this embodiment, the lens beam expander 4 , the lens beam expander 6 and the lens beam expander 11 are all Galilean beam expanders. The lens beam expander 4 is composed of a concave lens with a focal length of -200.12mm and a convex lens with a focal length of 400.38mm, which can expand the beam aperture of the laser pulse from 2mm to 4mm. The lens beam expander 6 is composed of a concave lens with a focal length of -83.84mm and a convex lens with a focal length o...

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Abstract

The invention discloses a compensation device and method for pulse-front distortion in a femtosecond laser pulse amplification system. The device is arranged between two amplification stages of the femtosecond laser pulse amplification system. The device comprises a concave lens and an off-axis parabolic mirror, wherein a focal length of the off-axis parabolic mirror is greater than the focal length of the concave lens; and the off-axis parabolic mirror and the concave lens are arranged in confocal way. The focal length of the concave lens is determined through calculation of the pulse-front distortion introduced by all lens beam expanders in the femtosecond laser pulse amplification system. The focal length of the off-axis parabolic mirror can be determined according to a beam expanding ratio required by the femtosecond laser pulse amplification system and the focal length of the concave lens. Through use of the device in the femtosecond laser pulse amplification system, beam expansion of laser pulses can be realized, and the pulse-front distortion caused by the lens beam expanders can be effectively compensated, so that real focusing peak intensities of focused femtosecond laser pulses are improved.

Description

technical field [0001] The invention relates to pulse front distortion in a femtosecond laser pulse amplification system, in particular to a compensation device and compensation method for pulse front distortion. Background technique [0002] The invention of chirped pulse amplification technology has promoted the rapid development of ultra-intense and ultra-short pulse laser systems. At present, the peak power of the Ti:Sapphire femtosecond laser pulse amplification system has reached petawatts (1 petawatt=10 15 W) magnitude. In order to avoid damage to the optical components in the laser pulse amplification system, the beam aperture of the laser pulse is correspondingly increased to the order of hundreds of millimeters or even hundreds of millimeters through the pulse beam expander. With the increase of laser pulse peak power and beam aperture, the pulse front distortion caused by the lens beam expander in the laser pulse amplification system has gradually attracted peop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/10G02F1/39
CPCG02F1/39H01S3/10007H01S3/10023
Inventor 许毅吴分翔冷雨欣
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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