Device and method for shortening length of filament of femtosecond laser in air
A femtosecond laser and filament forming technology, which is applied in optics, nonlinear optics, instruments, etc., can solve the problems of expensive, lens processing, and assembly difficulties, and achieve the goals of improving resolution, reducing noise, and improving signal-to-noise ratio Effect
Inactive Publication Date: 2013-08-14
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology
Lenses of such a large size are difficult to process, assemble, etc., and are expensive
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[0017] 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.
[0018] see first figure 1 , figure 1 It is a schematic diagram of the principle of the method of the present invention. The present invention aims to provide a device and method for shortening the filament length of femtosecond laser in air. The key is to use the time-space focusing technology to convert the laser pulse generated by the chirped pulse amplification technology without a compressor through the grating pair to convert the time chirp into a space chirp, and then focus through the lens, so that the light of different frequencies is only in the The focus overlaps to form a strong ultra-short and ultra-intense laser pulse, and at the place away from the focus, because the light of different frequencies does not overlap in time and space, the pulse width increases...
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Abstract
The invention relates to a device and method for shortening the length of the filament of femtosecond laser in air. The device consists of a plano-convex cylindrical lens, a plano-concave cylindrical lens, a first optical grating, a second optical grating and a condenser lens which are arranged on an output optical path of the femtosecond laser in sequence, the first optical grating and the second optical grating are opposite to each other and are arranged in parallel, the distance between the plano-convex cylindrical lens and the plano-concave cylindrical lens is the difference between focaldistances of the plano-convex cylindrical lens and the plano-concave cylindrical lens. The device and method provided by the invention have the advantages of simpleness and effectiveness; the length of the optical filament formed by the device and method provided by the invention is shortened greatly by over ten times as compared with the length of the optical filament formed by a condenser lens only; the short optical filament is beneficial to the improvement of the resolution ratio of remote detection, the position of the optical filament can be changed through changing the distance betweenthe optical gratings, and the optical filament can be applied to scanning detection; moreover, the short optical filament is capable of greatly reducing noise in the process of remote detection, thereby improving the signal to noise ratio of detection. The method is very important for accurate remote scanning detection.
Description
technical field [0001] The invention relates to high-field laser physics, in particular to a device and method for shortening the filament length of a femtosecond laser in the air, which is of great significance for long-distance precise scanning and detection. Background technique [0002] The emergence of femtosecond pulsed lasers has greatly promoted the development of research fields such as femtosecond chemistry, atomic and molecular dynamics detection, and biological imaging. However, due to the influence of factors such as diffraction and group velocity dispersion in the laser propagation process, it has been considered for a long time that ultrashort laser pulses are not suitable for long-distance transmission in air. However, in the experiment, the strong femtosecond laser can stably transmit tens of meters or even thousands of meters in the air, while the peak light intensity inside the filament is kept at 10 13 ~10 14 W / cm 2 Unchanged, that is, the so-called "f...
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IPC IPC(8): G02F1/35
Inventor 曾斌姚金平储蔚倪洁蕾张海粟李贵花程亚徐至展
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI