Double-chirped optical parametric amplification method and device for broadband laser pumping

Abstract

The invention discloses a dual-chirp optical parameter amplification method and device for broadband laser pumping. An initial laser source generates narrow-band laser which is divided into two beams, wherein the beam with the high energy is adopted as narrow-band pumping light, and broadband chirp pumping light is obtained after a spectrum widening device, and the light is emitted into a nonlinear crystal through a dichroic mirror; the beam with the low energy enters a super-continuum white light generator and a chirp mirror pair to obtain broadband chirp seed light, is emitted into the non-linear crystal through the dichroic mirror, and is coupled with the broadband chirp pumping light to be subjected to optical parameter amplification; finally, periodic magnitude pulse width femtosecond idler frequency light is obtained through a beam splitter and a pulse compressor. The spectrum widening broadband chirp pumping light is adopted, and the more frequency components are obtained; the broadband chirp pumping light and broadband chirp seed light dual-chirp scheme is adopted, and the instantaneous frequency correspondences are opposite, so that the spectral brand width of output idler frequency light is increased, and the femtosecond idler frequency light output of the periodic magnitude pulse width is achieved.

Description

technical field [0001] The invention relates to the field of ultrafast laser technology, in particular to a double-chirped optical parametric amplification method and device for broadband laser pumping. Background technique [0002] Period-level high-energy laser pulses have important applications in research fields such as attosecond optics, strong-field physics, and ultrafast spectroscopy because of their good time resolution and extremely high peak power. Therefore, the study of generating period-level ultrashort pulses has attracted great attention from scientists. In the near-infrared band, common titanium sapphire (Ti:Sapphire) femtosecond lasers can already effectively generate ultrashort and ultraintense pulses with a central wavelength of 800 nanometers. However, in the study of the interaction between laser and matter, many key basic theories and practical applications not only require ultra-short pulse width and ultra-high peak intensity, but also require the cen...

AI Technical Summary

Problems solved by technology

Although the 40 femtosecond laser pulse has a large bandwidth, it is still not enough to support the pulse output of cycle-level pulse width, so the gain bandwidth of the system will be obviously limited in the optical parametric amplification system

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