Device and method for generating vector ultrashort laser pulse at middle-infrared band

Abstract

The invention discloses a device and method for generating vector ultrashort laser pulse at a middle-infrared band. Laser output at a middle-infrared corresponding wave band is achieved by a gain module taking a high-power and high-brightness pumping source and rare-earth ion-doped sesquioxide ceramic as a core component, output of pulse laser is achieved by a locked-mode component, output and control of a vector beam is achieved by a dual-refraction mode selection mechanism of an annular diaphragm, cavity non-linear management is achieved by a high non-linear medium, dispersion management isachieved by chirp mirror, and a round grating is used as a waveguide output coupling mirror to obtain an output of all-solid-state ultrafast laser at the middle-infrared band having vector characteristic. The obtained radial polarization vector beam at the middle-infrared band has a unique polarization singular point, the obtained pulse width is at optical period order, and the device has wide application in the frontier field such as high-precision laser medical operation, super-resolution imaging, quantum communication and attosecond light sources.

Description

technical field [0001] The invention relates to the field of ultrafast lasers and vector beams, in particular to a device and method for generating vector ultrashort laser pulses in the mid-infrared band. Background technique [0002] The mid-infrared solid-state ultrafast laser in the 2-5μm band has the characteristics of strong water absorption, low photon energy, high peak power, extremely high signal-to-noise ratio and short pulse width. Especially for pulses on the order of optical cycles, due to their extremely short timescales (~10 - 15 s), ultra-high peak power (~10 6 W) and other unique features, it has a wide range of applications in cutting-edge fields such as high-precision laser medical surgery, super-resolution imaging, molecular fingerprinting, quantum communication, and attosecond light sources. In particular, the vector ultrafast laser can be applied to the study of ultrafast dynamics in the microcosm and the seed source of ultrahigh power laser amplifier...

AI Technical Summary

Problems solved by technology

The first requires a pump source with high beam quality (usually a single-mode fiber laser) to increase the pump brightness and shrink the cavity mode A eff , to increase the equivalent interaction length, this method is expensive and has limited effect; the second is to use a very low outcoupling mirror (2 , this method is limited by the material's own atomic arrangement structure

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