【摘要】：交叉偏振波(XPW)技術(shù)是一種基于具有各向異性特征的三階非線性晶體的非線性濾波技術(shù),由于結(jié)構(gòu)簡單,穩(wěn)定可靠,是超強超快激光領(lǐng)域提高時域?qū)Ρ榷�、壓縮脈寬的有效手段之一.在實驗中發(fā)現(xiàn),XPW的輸出特性受驅(qū)動脈沖特性的直接影響,通過理論計算得到了XPW的脈寬和光譜寬度與驅(qū)動脈沖的啁啾特性關(guān)系,同時利用聲光可編程色散濾波器設計實驗對理論計算進行了驗證.結(jié)果表明:實驗結(jié)果很好地反映了理論計算得出的結(jié)論,同時在飽和功率密度條件下,還表現(xiàn)出了一些理論計算沒有反映出的新現(xiàn)象,即XPW的光譜展寬突破了驅(qū)動脈沖寬度√3倍的限制,最終脈寬也能夠壓縮至小于入射脈寬的1/√3;此外對于相反線性啁啾的驅(qū)動脈沖所產(chǎn)生的XPW信號,其在光譜形狀上有明顯的偏移差異,同時輸出效率也有所不同.最后對這些新現(xiàn)象進行了進一步的分析和理論解釋.
[Abstract]:Cross-polarization wave (XPW) is a nonlinear filtering technique based on third-order nonlinear crystals with anisotropic characteristics. Because of its simple structure and reliability, cross-polarization wave (XPW) is used to improve the time-domain contrast in the field of ultra-fast laser. One of the effective means of compression of pulse width. In the experiment, it is found that the output characteristics of XPW are directly affected by the characteristics of the driving pulse. The relationship between the pulse width and spectral width of XPW and the chirp characteristics of the driving pulse is obtained by theoretical calculation. At the same time, the theoretical calculation is verified by the design experiment of acousto-optic programmable dispersion filter. The results show that the experimental results well reflect the conclusions of the theoretical calculation, and at the same time, under the condition of saturated power density, there are some new phenomena which are not reflected in the theoretical calculation. That is, the spectral broadening of XPW breaks through the limit of 3 times of the width of the driving pulse, and the final pulse width can be compressed to 1 / 3 of the width of the incident pulse. In addition, for the XPW signals generated by linearly chirped driving pulses, there is a significant shift in the spectral shape and the output efficiency is also different. Finally, further analysis and theoretical explanation of these new phenomena are carried out.
【作者單位】： 中國科學院物理研究所北京凝聚態(tài)物理國家實驗室;北京信息科技大學儀器科學與光電工程學院;
【基金】：國家重點基礎(chǔ)研究發(fā)展計劃(批準號:2013CB922402) 國家重大科學儀器設備開發(fā)專項基金(批準號:2012YQ120047) 國家自然科學基金(批準號:11434016) 中國科學院戰(zhàn)略性先導科技專項(批準號:XDB16030200)資助的課題~~
【分類號】：O437
，

本文編號：2327281