Multi-color femtosecond laser generation device based on air-forming filaments

Abstract

The invention discloses a multi-color femtosecond laser generating device based on air filamentation. Two incident rays which participate in four-wave mixing are respectively a base laser pulse emitted from a titanium sapphire regenerating amplifier and a wide-spectrum laser pulse obtained by the filamentation of the femtosecond laser in air. The multi-color femtosecond laser generating device structurally comprises a beam splitting sheet on a main light path for dividing the incident rays into reflection rays and transmission rays, wherein the reflection rays are subjected to femtosecond filamentation in air to broaden spectrums, and are finally focused to a transparent nonlinear crystal; the transmission rays are finally focused on the nonlinear crystal; after intensity attenuation and time delay; two beams of incident rays are regulated to superpose in time and space, so that a plurality of beams of multi-color femtosecond laser can be obtained. The device disclosed by the invention has the characteristics of being convenient to regulate, compact in structure, economical and practical, adjustable in multi-color light center wavelength and strong in output power.

Description

technical field

[0001] The invention relates to a femtosecond laser, in particular to a multicolor femtosecond laser generating device based on air-forming filaments.

[0002] technical background

[0003] Femtosecond lasers have important applications in many cutting-edge scientific experiments such as physical optics, chemical optics, and bio-optics. At present, the central wavelength tunable femtosecond laser is usually generated by using a non-collinear parametric amplifier based on the second-order nonlinear coefficient. However, the non-collinear parametric amplifier can only generate one beam of femtosecond laser at a time. If some experiments require multiple beams of central wavelength Different femtosecond lasers must use multiple non-collinear parametric amplifiers, which undoubtedly increases the experimental cost. Based on cascaded four-wave mixing, multiple femtosecond lasers with adjustable center wavelength and wide spectral bandwidth can be generated at one ...

Examples

Embodiment Construction

[0018] The utility model will be further described below in conjunction with the accompanying drawings, but the protection scope of the utility model should not be limited with this.

[0019] Such as figure 2 As shown, the present invention is based on an air-filament multicolor femtosecond laser generating device, and the composition includes: a beam splitter 1 is arranged on the incident light path, and the beam splitter 1 divides the incident light into reflected light and transmitted light. The optical path of the reflected light is successively the first attenuation plate 9, the lens 10, the first concave reflector 11, the filter plate 12, the second attenuation plate 13, the second concave reflector 8 and the nonlinear crystal 14, in the The transmission optical path is the third attenuation plate 2, the first reflector 3, the second reflector 4, the third reflector 5, the fourth reflector 6, the third concave reflector 7 and the nonlinear crystal 14 in sequence, The f...

technical field

[0001] The invention relates to a femtosecond laser, in particular to a multicolor femtosecond laser generating device based on air-forming filaments.

[0002] technical background

[0003] Femtosecond lasers have important applications in many cutting-edge scientific experiments such as physical optics, chemical optics, and bio-optics. At present, the central wavelength tunable femtosecond laser is usually generated by using a non-collinear parametric amplifier based on the second-order nonlinear coefficient. However, the non-collinear parametric amplifier can only generate one beam of femtosecond laser at a time. If some experiments require multiple beams of central wavelength Different femtosecond lasers must use multiple non-collinear parametric amplifiers, which undoubtedly increases the experimental cost. Based on cascaded four-wave mixing, multiple femtosecond lasers with adjustable center wavelength and wide spectral bandwidth can be generated at one ...

Examples

Embodiment Construction

[0018] The utility model will be further described below in conjunction with the accompanying drawings, but the protection scope of the utility model should not be limited with this.

[0019] Such as figure 2 As shown, the present invention is based on an air-filament multicolor femtosecond laser generating device, and the composition includes: a beam splitter 1 is arranged on the incident light path, and the beam splitter 1 divides the incident light into reflected light and transmitted light. The optical path of the reflected light is successively the first attenuation plate 9, the lens 10, the first concave reflector 11, the filter plate 12, the second attenuation plate 13, the second concave reflector 8 and the nonlinear crystal 14, in the The transmission optical path is the third attenuation plate 2, the first reflector 3, the second reflector 4, the third reflector 5, the fourth reflector 6, the third concave reflector 7 and the nonlinear crystal 14 in sequence, The f...

Images