發(fā)布時(shí)間：2018-05-21 18:00

  本文選題：光參量放大 + 光學(xué)相位共軛　； 參考：《物理學(xué)報(bào)》2017年10期

【摘要】：非線性光學(xué)相位共軛技術(shù)可將經(jīng)過散射介質(zhì)后產(chǎn)生畸變的光學(xué)波前進(jìn)行修復(fù).本文基于光參量放大(OPA)過程的光學(xué)相位共軛(OPC)特性,進(jìn)行了光學(xué)相位共軛圖像修復(fù)和增強(qiáng)的實(shí)驗(yàn)研究.基于大能量532 nm皮秒抽運(yùn)激光和大口徑非線性光學(xué)晶體KTiOPO_4(KTP)(Ⅱ類相位匹配),對(duì)經(jīng)過牛奶乳濁液后已無(wú)法識(shí)別的1064 nm近紅外光學(xué)圖像,進(jìn)行相位共軛修復(fù),修復(fù)后的圖像分辨率達(dá)12線/mm,此外,結(jié)合OPA過程的光學(xué)增益特性,實(shí)現(xiàn)了超過17 dB的光學(xué)圖像增強(qiáng),為現(xiàn)有三波混頻光學(xué)相位共軛修復(fù)畸變所獲圖像增益的最大值.在此基礎(chǔ)上,峰值信噪比較修復(fù)之前有160%的提升.考慮到光參量過程所具有的波長(zhǎng)可調(diào)諧特性,在實(shí)際應(yīng)用中,可根據(jù)需要,選擇與生物組織的光學(xué)治療窗口相匹配的成像波長(zhǎng),從而保證更長(zhǎng)的穿透深度,提升生物組織成像和醫(yī)學(xué)無(wú)損檢測(cè)的效果.
[Abstract]:Nonlinear optical phase conjugation technique can repair the distorted optical wavefront after passing through the scattering medium. Based on the optical phase conjugation (OPA) characteristics of optical parametric amplification (OPA) process, an experimental study on the restoration and enhancement of optical phase conjugation images has been carried out in this paper. Based on the large energy 532nm picosecond pumped laser and the large aperture nonlinear optical crystal KTiOPO _ 4 / KTP _ (鈪，

本文編號(hào)：1920208