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Device and method for increasing filamentation length of femtosecond laser in air

A femtosecond laser, air technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems of multi-filament structure, easy filament formation, and filament application limitations.

Inactive Publication Date: 2010-06-02
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

However, in the case of loose focusing, the hot spots on the spot will easily form filaments, which will result in a multi-filament structure, especially when the incident light energy is relatively high, which will limit the specific application of filaments

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  • Device and method for increasing filamentation length of femtosecond laser in air
  • Device and method for increasing filamentation length of femtosecond laser in air
  • Device and method for increasing filamentation length of femtosecond laser in air

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.

[0020] see first figure 1 , figure 1 It is a schematic diagram of the structure of the transmission phase plate, the left is a cross-sectional view, and the right is a top view. A circular region with a diameter of 5 mm is etched on the surface of K9 glass with a thickness of about 1.8 mm by wet etching (or ion beam etching or other etching methods), and the etching depth is about 0.78 μm. After the incident light passes through this phase plate, the central area of ​​the light spot and the outer ring part will have a phase difference of π (the inner ring phase is ahead of π).

[0021] It is worth noting that the design structure of the phase plate is not unique, and can be designed into any phase change mode, depending on the design results. In addition, the phase plate...

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Abstract

The invention provides a device and method for increasing filamentation length of femtosecond laser in the air. The device is characterized in that adjustable apertures, a phase plate and a focusing lens are sequentially arranged on a light path for outputting collimated femtosecond laser. The experiments show that after passing through the phase plate, the high-energy femtosecond laser pulse changes the focusing characteristic of the focused zone due to interference effect, thus greatly increasing the length of the focused zone. Compared with the common Gaussian beam focusing, the method of the invention ensures supercontinuum radiation to focus in the axial direction, thus ensuring more energy to be conveyed to farther places, which is of great significance in laser triggered lightning, remote atmospheric sounding and acquisition of superstrong and supershort few-cycle laser pulse.

Description

technical field [0001] The invention relates to high-field laser physics, in particular to a device and method for prolonging the length of femtosecond laser filamentation in the air, which has important applications for laser remote atmospheric detection, laser lightning induction, and obtaining ultra-short and ultra-intense laser pulses. Background technique [0002] With the emergence of femtosecond lasers, people's research has achieved many important research results in various disciplines such as chemistry, physics, and biology. However, for a long time, people believed that due to the influence of diffraction, group velocity dispersion, etc., ultra-intense and ultra-short lasers are not suitable for long-distance transmission in air, for example, laser pulses with a beam waist of 5 mm and a pulse width of 30 fs , the strength will attenuate about 5×10 after traveling 1000 meters in the air 3 . However, in actual experiments, people found that the transmission of fem...

Claims

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Application Information

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IPC IPC(8): G02F1/35
Inventor 付玉喜熊辉徐晗姚金平曾斌储蔚程亚徐至展
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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