The dispersion caused from the chromatic aberrations of lens is smaller than that from diffraction effects of it 與衍射效應(yīng)產(chǎn)生的色散相比,透鏡本身的折射率色散很小。
In order to interpret the experimental results , the radiative transfer theory is modified and the diffraction effects are considered in the modified theory 為了解釋這種衍射現(xiàn)象,將衍射效應(yīng)考慮進(jìn)輻射傳輸模型,對(duì)輻射傳輸理論進(jìn)行了修正。
To minimize harmful diffraction effects , the secondary , or diagonal , mirror is generally only large enough to let the central portion of the focal plane receive light from the whole primary mirror 為減小不利的衍射效應(yīng),副鏡,或平面鏡的大小只是剛夠把主鏡在焦平面的像反射就行了。
The land clutter is useless signals for target detection caused by land terrain . the multipath effect is some kind of interference which is caused by wave reflection on terrain . the diffraction effect is the phenomenon of wave propagation into shadow region 地雜波是由地面散射引起的對(duì)目標(biāo)探測無用的信號(hào);多路徑是由電磁波在地面反射所引起的干涉;衍射則是電波繞射傳播到遮蔽區(qū)的現(xiàn)象。
It shows that when walk - off and diffraction effects could be ignored approximately estimation of the phase distribution of second - harmonic wave could be done . the far field divergent angle and second moment radius of harmonic wave will vary with the aberration of fundamental wave , but the far field divergent angle will be obviously smaller than that of fundamental wave . the phase distribution of both fundamental and harmonic wave is measured using hartmann - shack wave front sensor in the experiment with 1064nm and 790nm lasers , respectively 這說明利用非線性光學(xué)頻率變換方法拓寬波前傳感器件的響應(yīng)波段是很難實(shí)現(xiàn)的,但是,通常三波相互作用過程的研究均是建立在平面波和理想高斯光束之上,因此我們對(duì)于位相畸變倍頻過程的研究是非線性光學(xué)領(lǐng)域一個(gè)重要而有意義的新課題,它有助于人們更加深入理解非線性光學(xué)效應(yīng),為進(jìn)一步合理利用之奠定了理論和實(shí)驗(yàn)的基礎(chǔ)。