實驗名稱：雙路(lu)脈沖相干合(he)成系統及主動(dong)相位控制系統

　　測試設備：電壓放(fang)大器(qi)、光電探(tan)測器(qi)、低(di)通濾波器(qi)、PZT等。

　　圖1：主動相位(wei)控(kong)制系統結構示意圖

　　實驗過程：

　　系統中HC探(tan)測(ce)(ce)器由波(bo)片，PBS和(he)(he)兩個光(guang)電(dian)探(tan)測(ce)(ce)器組成，光(guang)電(dian)探(tan)測(ce)(ce)器在PBS的(de)(de)s偏振端和(he)(he)p偏振端進(jin)(jin)(jin)行(xing)探(tan)測(ce)(ce)，測(ce)(ce)得(de)(de)的(de)(de)強度(du)(du)信(xin)(xin)(xin)號通(tong)過差分放大(da)(da)器提取包含光(guang)程(cheng)(cheng)差相(xiang)位信(xin)(xin)(xin)息的(de)(de)誤差信(xin)(xin)(xin)號，該誤差信(xin)(xin)(xin)號經低通(tong)濾波(bo)器濾波(bo)后通(tong)過PI2D相(xiang)位控(kong)(kong)制(zhi)(zhi)(zhi)(zhi)電(dian)路進(jin)(jin)(jin)行(xing)反饋控(kong)(kong)制(zhi)(zhi)(zhi)(zhi)，反饋信(xin)(xin)(xin)號經電(dian)壓放大(da)(da)器放大(da)(da)后對PZT進(jin)(jin)(jin)行(xing)驅動(dong)控(kong)(kong)制(zhi)(zhi)(zhi)(zhi)。主動(dong)相(xiang)位控(kong)(kong)制(zhi)(zhi)(zhi)(zhi)系統的(de)(de)結構簡(jian)圖如圖1所示。系統中采用(yong)的(de)(de)PZT控(kong)(kong)制(zhi)(zhi)(zhi)(zhi)精度(du)(du)為(wei)0.28μm/V，可承受的(de)(de)最高(gao)電(dian)壓為(wei)150V，最大(da)(da)伸長量為(wei)42μm。通(tong)過調節相(xiang)位控(kong)(kong)制(zhi)(zhi)(zhi)(zhi)電(dian)路的(de)(de)偏置電(dian)壓，可以對兩路脈沖之間的(de)(de)相(xiang)位差進(jin)(jin)(jin)行(xing)微調。當外界環境變(bian)化或噪聲擾動(dong)對光(guang)程(cheng)(cheng)差噪聲影響(xiang)時，HC偏振探(tan)測(ce)(ce)器檢測(ce)(ce)得(de)(de)到的(de)(de)相(xiang)位差發(fa)生改變(bian)，反饋信(xin)(xin)(xin)號通(tong)過改變(bian)PZT的(de)(de)驅動(dong)電(dian)壓對光(guang)程(cheng)(cheng)差進(jin)(jin)(jin)行(xing)相(xiang)位補償。

　　圖2：光程差為0位置處鎖定前后探(tan)測(ce)(ce)器測(ce)(ce)得的功率起伏

　　實驗中首(shou)先在光程差接近0處對(dui)合成(cheng)前后合成(cheng)光的(de)(de)功(gong)(gong)率(lv)變化進(jin)行測量，通過微調(diao)控制電(dian)路偏置電(dian)壓，使系(xi)(xi)統的(de)(de)合成(cheng)效率(lv)最高，此(ci)時認為(wei)此(ci)時光程差為(wei)零，此(ci)時的(de)(de)鎖相(xiang)效果(guo)如圖2所(suo)示。對(dui)相(xiang)位(wei)鎖定(ding)系(xi)(xi)統性(xing)能(neng)進(jin)行驗證使，放大器(qi)輸出功(gong)(gong)率(lv)較低，此(ci)時不需要對(dui)開啟水(shui)冷(leng)對(dui)系(xi)(xi)統進(jin)行水(shui)冷(leng)散熱，外界(jie)環境擾(rao)動對(dui)系(xi)(xi)統的(de)(de)影響(xiang)較小。

　　實驗結果：

　　圖3：鎖定狀態(tai)下，光程差與系統合成效率之間的關(guan)系

　　通過調節電動(dong)延時線的(de)位置產生(sheng)一定的(de)光程差以驗證(zheng)鎖相系(xi)統的(de)性(xing)能，圖3描述了不(bu)同光程差下系(xi)統合(he)成效率的(de)變化。

　　當(dang)光(guang)(guang)(guang)(guang)程(cheng)(cheng)差(cha)(cha)在(zai)10μm范(fan)圍(wei)(wei)(wei)內時(shi)，系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)合(he)成(cheng)效(xiao)(xiao)率基(ji)本保持在(zai)90%以(yi)上(shang)；當(dang)光(guang)(guang)(guang)(guang)程(cheng)(cheng)差(cha)(cha)增大(da)至(zhi)25μm時(shi)，系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)合(he)成(cheng)效(xiao)(xiao)率下(xia)降至(zhi)80%，由于(yu)此(ci)時(shi)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)輸出功率較低(di)，合(he)成(cheng)效(xiao)(xiao)率的(de)(de)(de)降低(di)主(zhu)(zhu)要(yao)來自于(yu)光(guang)(guang)(guang)(guang)程(cheng)(cheng)失配(pei)，同時(shi)由于(yu)電動光(guang)(guang)(guang)(guang)纖延時(shi)線(xian)運動過程(cheng)(cheng)中會對(dui)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)耦(ou)合(he)產(chan)生一定(ding)的(de)(de)(de)影響(xiang)，從(cong)而(er)影響(xiang)輸出光(guang)(guang)(guang)(guang)斑(ban)質量，因此(ci)空間光(guang)(guang)(guang)(guang)場位置失配(pei)也(ye)會導(dao)致部分合(he)成(cheng)效(xiao)(xiao)率的(de)(de)(de)損(sun)耗；當(dang)光(guang)(guang)(guang)(guang)程(cheng)(cheng)差(cha)(cha)大(da)于(yu)60μm時(shi)，系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)合(he)成(cheng)效(xiao)(xiao)率下(xia)降至(zhi)60%，此(ci)時(shi)光(guang)(guang)(guang)(guang)程(cheng)(cheng)差(cha)(cha)失配(pei)是(shi)導(dao)致合(he)成(cheng)效(xiao)(xiao)率下(xia)降的(de)(de)(de)主(zhu)(zhu)要(yao)因素，空間光(guang)(guang)(guang)(guang)場失配(pei)對(dui)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)合(he)成(cheng)效(xiao)(xiao)率的(de)(de)(de)影響(xiang)較小；當(dang)光(guang)(guang)(guang)(guang)程(cheng)(cheng)差(cha)(cha)大(da)于(yu)80μm時(shi)，此(ci)時(shi)促動器已無(wu)法將(jiang)兩(liang)路放大(da)器之(zhi)間的(de)(de)(de)光(guang)(guang)(guang)(guang)程(cheng)(cheng)差(cha)(cha)補(bu)(bu)償至(zhi)相(xiang)(xiang)(xiang)干長度范(fan)圍(wei)(wei)(wei)內，主(zhu)(zhu)動相(xiang)(xiang)(xiang)位控(kong)(kong)(kong)(kong)制(zhi)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)無(wu)法對(dui)光(guang)(guang)(guang)(guang)程(cheng)(cheng)差(cha)(cha)進(jin)行補(bu)(bu)償，系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)難(nan)以(yi)實(shi)現(xian)合(he)成(cheng)光(guang)(guang)(guang)(guang)同相(xiang)(xiang)(xiang)輸出，此(ci)時(shi)，光(guang)(guang)(guang)(guang)程(cheng)(cheng)差(cha)(cha)已超出相(xiang)(xiang)(xiang)位控(kong)(kong)(kong)(kong)制(zhi)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)的(de)(de)(de)控(kong)(kong)(kong)(kong)制(zhi)范(fan)圍(wei)(wei)(wei)。因此(ci)，主(zhu)(zhu)動相(xiang)(xiang)(xiang)位控(kong)(kong)(kong)(kong)制(zhi)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)的(de)(de)(de)控(kong)(kong)(kong)(kong)制(zhi)范(fan)圍(wei)(wei)(wei)約(yue)±20μm，在(zai)此(ci)范(fan)圍(wei)(wei)(wei)內，相(xiang)(xiang)(xiang)位控(kong)(kong)(kong)(kong)制(zhi)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)可以(yi)將(jiang)合(he)成(cheng)效(xiao)(xiao)率提升(sheng)至(zhi)最優值，超過此(ci)范(fan)圍(wei)(wei)(wei)，仍能實(shi)現(xian)一定(ding)程(cheng)(cheng)度的(de)(de)(de)相(xiang)(xiang)(xiang)位控(kong)(kong)(kong)(kong)制(zhi)，但合(he)成(cheng)效(xiao)(xiao)率會有(you)所(suo)下(xia)降，不能實(shi)現(xian)完(wan)全的(de)(de)(de)相(xiang)(xiang)(xiang)位補(bu)(bu)償。在(zai)該相(xiang)(xiang)(xiang)位控(kong)(kong)(kong)(kong)制(zhi)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)的(de)(de)(de)基(ji)礎(chu)上(shang)對(dui)電動延時(shi)線(xian)進(jin)行補(bu)(bu)償控(kong)(kong)(kong)(kong)制(zhi)，則可以(yi)實(shi)現(xian)更寬補(bu)(bu)償范(fan)圍(wei)(wei)(wei)的(de)(de)(de)相(xiang)(xiang)(xiang)位鎖定(ding)。

　　電壓放大器推薦：ATA-2088

　　圖：ATA-2088高壓放大器指標參數

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