AA-M提供兩個(gè)同步測(cè)量點(diǎn):一個(gè)是在顯微鏡,另一個(gè)是裝置的光學(xué)頭的放置位置,即顯微鏡輸入之前的點(diǎn)的焦平面上。在這兩個(gè)測(cè)量得到的脈沖的持續(xù)時(shí)間值的比較確定,由于顯微鏡的光學(xué)元件的色散引入的脈沖展寬。在超短脈沖應(yīng)用在顯微鏡的很多例子中,了解顯微鏡焦點(diǎn)處的時(shí)域和頻域特性是至關(guān)重要的。當(dāng)脈沖寬度越短,非線性成像(雙光子激發(fā))效率越高,需要的激發(fā)能量越少時(shí),這些測(cè)量對(duì)實(shí)驗(yàn)的成功至關(guān)重要。這種光束特性在確定樣品時(shí)很重要,它確保了圖像的優(yōu)化和正確的強(qiáng)度等級(jí)的估計(jì),因?yàn)椴徽_的值甚至可能導(dǎo)致樣品的損傷。
自相關(guān)蓋幾個(gè)波長(zhǎng)范圍的不同型號(hào),與AA-MM模型采用3對(duì)可互換臺(tái)光電探測(cè)器和光學(xué)相結(jié)合的范圍。兩個(gè)獨(dú)立的范圍內(nèi),也可根據(jù)要求覆蓋。輸入脈沖持續(xù)時(shí)間范圍從20 FS到12 ps的,便于監(jiān)控不同的激光系統(tǒng)。
該器件具有USB接口,可以方便地掛接到一臺(tái)PC使用Windows操作系統(tǒng)。該軟件是隨設(shè)備一起提供,并包括幾個(gè)有用的工具。被收購(gòu)的脈沖持續(xù)時(shí)間的數(shù)據(jù)可以可視化,存儲(chǔ)或?qū)С龅轿谋净騞at文件。自相關(guān)函數(shù)和在飛秒最終FWHM脈沖持續(xù)時(shí)間的計(jì)算和實(shí)時(shí)顯示。此外,Gaussian或sech2接頭選項(xiàng)被啟用,強(qiáng)度函數(shù)也可以觀察到。統(tǒng)計(jì)瀏覽器功能允許從幾個(gè)不同的脈沖測(cè)量獲得的數(shù)據(jù)進(jìn)行比較。
應(yīng)用:
● 多光子顯微術(shù)
● 飛秒脈沖持續(xù)時(shí)間測(cè)量之前和脈沖發(fā)生后 的光分散在顯微鏡或任何其他光學(xué)器件
● 色散值的比較,確定各種光學(xué)元件的色散
技術(shù)參數(shù):
型號(hào) | AA-M |
Possible full wavelength range* | 450-3200 nm |
Subranges* (exchangeable photodetectors/beam splitter sets) | V**: 450-700 nm R1: 700-1300 nm R2: 1300-2000 nm |
Input pulse duration range | 20 fs -12 ps |
Number of photodetectors for one range | two (internal and external for sample position) |
Input pulse repetition rate | >10 kHz |
Typical sensitivity (Pav*Ppeak) | 100 mW2 |
Input polarization | linear, horizontal (vertical upon request) |
Scan rate | 0.1-20 Hz |
Linear distortion | <1% |
Collinear (interferometric and intensity) autocorrelation | yes |
PC connection | USB, Windows PC acquisition and analysis software is included in the standard package |
Necessary equipment | Windows PC platform or an oscilloscope |
Signal source and detector | Two-photon conductivity in semiconductor |
Dimensions | 210x164x132 mm (optical unit) 225x190x45 mm (control unit) 70х55х16.5 mm (external photodetector) |
* - the autocorrelator may cover one, two or all three subranges with exchangeable photodetectors/beam splitter sets (1, 2 or all 3 sets may be included in the package depending on required laser source specifications); ** - the 450-700 nm subrange may only be purchased with the main unit order. |