性能: 這些液晶可變(bian)延(yan)遲(chi)器均勻度良好,光損耗(hao)低(di)且波前畸變(bian)小。此外(wai),它們(men)響(xiang)應(ying)迅(xun)速,工作溫度范(fan)圍(wei)廣,波長范(fan)圍(wei)廣。詳情請見規格、性能(neng)和響(xiang)應(ying)時間(jian)標簽(qian)。我(wo)們(men)同樣提供熱穩定半波延遲器,具有更好(hao)的(de)長期穩定性能(neng)。
工作 如圖 1所(suo)示,液(ye)晶(jing)可(ke)(ke)變(bian)延遲(chi)器由(you)填滿液(ye)晶(jing)(LC)分(fen)子(zi)(zi)(zi)溶液(ye)的透明液(ye)晶(jing)盒(he)構成(cheng),用作(zuo)(zuo)可(ke)(ke)變(bian)波片(pian)。在(zai)(zai)未加(jia)電壓(ya)的情(qing)況(kuang)下,LC分(fen)子(zi)(zi)(zi)的取(qu)向(xiang)(xiang)由(you)取(qu)向(xiang)(xiang)膜決定。取(qu)向(xiang)(xiang)膜由(you)有機(ji)聚酰亞胺(PI)膜層構成(cheng),分(fen)子(zi)(zi)(zi)在(zai)(zai)制(zhi)造期(qi)間沿摩(mo)擦方向(xiang)(xiang)排列。由(you)于LC材料的雙折射性,LC延遲(chi)器可(ke)(ke)以用作(zuo)(zuo)光學(xue)各向(xiang)(xiang)異性波片(pian),機(ji)械外殼上(shang)標(biao)有慢軸(zhou),與延遲(chi)器的表面平行(xing)。液(ye)晶(jing)盒(he)壁的兩個平行(xing)面鍍有透明導電膜,可(ke)(ke)在(zai)(zai)液(ye)晶(jing)盒(he)上(shang)施(shi)(shi)加(jia)電壓(ya)。施(shi)(shi)加(jia)交流電壓(ya)后,LC分(fen)子(zi)(zi)(zi)會根據所(suo)施(shi)(shi)電壓(ya)Vrms改(gai)變(bian)默認(ren)排列方向(xiang)(xiang)。因此,改(gai)變(bian)施(shi)(shi)加(jia)電壓(ya)可(ke)(ke)以主動控制(zhi)液(ye)晶(jing)可(ke)(ke)變(bian)延遲(chi)器的延遲(chi)。
殘余延遲量補償 由于PI層表面(mian)錨定,即使施加電(dian)壓,仍有(you)一些液(ye)(ye)晶(jing)分子無(wu)法改變方向,尤其是靠近取向膜(mo)層的(de)(de)分子。這樣(yang),LC延(yan)(yan)遲(chi)(chi)(chi)(chi)(chi)器(qi)在工作期間產生了殘余延(yan)(yan)遲(chi)(chi)(chi)(chi)(chi)量(liang)(liang)。無(wu)補(bu)償(chang)(chang)的(de)(de)LC延(yan)(yan)遲(chi)(chi)(chi)(chi)(chi)器(qi)在25 Vrms驅動電(dian)壓下具有(you)~30 nm的(de)(de)殘余延(yan)(yan)遲(chi)(chi)(chi)(chi)(chi)量(liang)(liang),如上面(mian)的(de)(de)圖 2所(suo)示。為了滿足敏(min)感應(ying)用中真(zhen)(zhen)實零延(yan)(yan)遲(chi)(chi)(chi)(chi)(chi)量(liang)(liang)的(de)(de)需要,我們提供(gong)有(you)補(bu)償(chang)(chang)的(de)(de)LC延(yan)(yan)遲(chi)(chi)(chi)(chi)(chi)器(qi)。由液(ye)(ye)晶(jing)聚(ju)合物(LCP)構成的(de)(de)補(bu)償(chang)(chang)層粘在液(ye)(ye)晶(jing)盒上,慢軸(zhou)垂直于液(ye)(ye)晶(jing)盒的(de)(de)慢軸(zhou)。LCP補(bu)償(chang)(chang)層的(de)(de)固定延(yan)(yan)遲(chi)(chi)(chi)(chi)(chi)量(liang)(liang)為~50 nm。因此,特定驅動電(dian)壓在5 V到20 V之間時(shi),液(ye)(ye)晶(jing)盒與補(bu)償(chang)(chang)器(qi)的(de)(de)延(yan)(yan)遲(chi)(chi)(chi)(chi)(chi)量(liang)(liang)相互抵消,產生真(zhen)(zhen)實零延(yan)(yan)遲(chi)(chi)(chi)(chi)(chi)量(liang)(liang)。但是,這樣(yang)可能導(dao)致延(yan)(yan)遲(chi)(chi)(chi)(chi)(chi)均勻度稍微變低,總厚度增加。更多信(xin)息(xi),請看(kan)規格和性(xing)能標(biao)簽。
控制器 雖然采(cai)用交(jiao)流(liu)電(dian)壓(0到(dao)25 Vrms),但(dan)LCC25控制器(下面有售)提供主(zhu)動直流(liu)偏(pian)(pian)移(yi)補償。直流(liu)偏(pian)(pian)移(yi)補償自動將液晶設備的直流(liu)偏(pian)(pian)壓置(zhi)零(ling),以抵消電(dian)荷積累,避免損壞(huai)LC裝置(zhi)。它兼容(rong)所(suo)有液晶延遲器。
特性
Item #
LCC1411-A
LCC1421-A
LCC1411-B
LCC1421-B
LCC1411-C
LCC1421-C
單價(jia)(元)
7100
11500
Wavelength Range
350 - 700 nma
650 - 1050 nm
1050 - 1700 nm
Retardance Range
0 nm to >λ/2
Clear Aperture
?10 mm
?20 mm
Housing Outer Dimensions
?1"b (?25.4 mm)
?2.20"c (?55.8 mm)
Liquid Crystal Material
Nematic Liquid Crystal
Surface Quality
60-40 Scratch-Dig
Beam Deviation
< 5 arcmin
15.8 ms / 260 μs @ 22 °C
34.0 ms / 360 μs @ 22 °C
152 ms / 510 μs @ 25.6 °C
Pulsed (ns)
1.0 J/cm2 (532 nm, 10 Hz, 8 ns, ?200 μm)
1.7 J/cm2 (810 nm, 10 Hz, 7.6 ns, ?234 μm)
1.2 J/cm2 (1542 nm, 10 Hz, 10 ns, ?458 μm)
Pulsed (fs)
0.01 J/cm2 (532 nm, 100 Hz, 76 fs, ?162 μm)
0.01 J/cm2 (800 nm, 100 Hz, 36.4 fs, ?189 μm)
0.08 J/cm2 (1550 nm, 100 Hz, 70 fs, ?145 μm)
AR Coating
Ravg < 0.5%e
Wavefront Distortion
≤λ/4 (@ 635 nm)
Retardance Uniformity (RMS)f
< λ/20
Housing Thickness
8.6 mm (0.34")
15.0 mm (0.59")
Storage Temperature
-30 to 70 °C
Operation Temperature
-20 to 45 °C
LCC1111U-A
LCC1111-A
LCC1221-A
LCC1111-B
LCC1221-B
LCC1111-C
LCC1221-C
LCC1111-D
LCC1111-MIR
單(dan)價(元(yuan))
3000
5100
8500
7500
20000
1650 - 3000 nm
3600 - 5600 nm
~30 nm to >λ/2
17.0 × 12.0 mm (0.67" × 0.47")
?2"g (?50.8 mm)
40-20 Scratch-Dig
10.2 ms / 310 μs @ 22 °C
31.3 ms / 704 μs @ 25.6 °C
95.8 ms / 1.81 ms @ 25.6 °C
192 ms / 1 ms @ 25.6 °C
372 ms / 14 ms @ 25.6 °C
0.041 J/cm2 (2000 nm, 10 Hz, 6.5 ns, ?292 μm)
N/A
0.025 J/cm2 (2000 nm, 100 Hz, 100 fs, ?220 μm)
Ravg < 1.0%e
-
< λ/50
< λ/30
< λ/10
Housing Dimensional Tolerance
±0.4 mm
6.0 mm (0.24")
8.0 mm (0.32")
液(ye)晶控制(zhi)器
LCC25液(ye)晶(jing)控(kong)制器兼容Thorlabs所有的(de)LC可變延(yan)遲器和(he)偏(pian)振(zhen)延(yan)遲器,非(fei)常適(shi)合驅(qu)動大多(duo)數(shu)其他向列型液(ye)晶(jing)設(she)備。向列型液(ye)晶(jing)延(yan)遲器必須(xu)采用(yong)交(jiao)(jiao)流電(dian)壓(ya)驅(qu)動,以防電(dian)荷分層(ceng)和(he)累積,避免器件損(sun)壞。除了提(ti)供2000 Hz的(de)交(jiao)(jiao)流驅(qu)動電(dian)壓(ya),LCC25控(kong)制器自動把(ba)液(ye)晶(jing)器件上的(de)直(zhi)流偏(pian)壓(ya)置零,以抵消電(dian)荷累積。LCC25的(de)交(jiao)(jiao)流輸出電(dian)壓(ya)可通過前面板(ban)、0 - 5 V直(zhi)流TTL輸入或USB接口(kou)調(diao)節。
型號
參數
單價(元)
LCC25
液晶(jing)控制器,0-25 V交(jiao)流,方(fang)波(bo),占空比50%
13000