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              液晶相位延遲器
              The LC Variable Phase Retarder
              商品貨號:ECS002181
              商品品牌:Arcoptix
              詳細介紹

              液晶相位延遲器

              液晶相位延遲器是通過電壓控制液晶分子的折射率來實現對光的相位延遲。能夠精確調控特定波長的相位延遲量。

              提供多種規格的產品,分別適用于工業和科研等領域的需要,亦可根據客戶需要定制產品。

               

              Devices

               

              Industrial grade (23mm ap. without housing)

               

              Industrial grade (larger ap. without housing)

               

              Scientific grade (10mm ap.with housing)

               

                 Scientific grade (20mm ap.with housing)

               

                 USB LC Driver (2 outputs)

              optional

               

              The LC Variable Phase Retarder


              The liquid crystal variable phase retarder (or phase shifter) is a transmissive element with an electrically tunable optical phase retardance. Optical retardation is often obtained with piezoelectric mirrors. However this option is not ideal if robust and compact design is necessary. This product offer an interesting alternative especially when working with polarized light (which is often the case when working with lasers). The Arcoptix phase shifter is a thin transmissive element causing minimal losses and can be simply placed within the optical path of our system. The more, its optical retardation is electrically tunable with the LC driver of ARCoptix (but it can also be driven with simple labor alternative power supply). It can also be used as optical valve (for a narrow wavelength range) or as polarization State controller. To summarize :

              Compact and robust device     

              Transmissive element      

              No moving parts      

              Electrically Tunable
               

              Needs polarized light      

              Weak absorption in VIS      

              Optical valve (with extra polarizer)      

              Polarization state controller

               10mm aperture Scientific grade LC variable  

                   20mm aperture Scientific grade LC variable phase retarder

              The liquid crystal variable phase shifter can be compared to a variable waveplate. By addressing it with the right voltage, it is able to provide any phase shift from zero to several times the light wavelength. They can be used throughout the visible and the near infrared region (400nm to 1800nm) without losses higher than 15%. Thanks to the use of thick substrate (scientific grade) and a special liquid crystal bend were are capable to offer robust equipment with minimal wavefront distortion and power absorption.

              Retarder type selection

              In functions of your needs you can select essentially between three categories of products:

              Retarder Type

              Specificities

              Applications

              Industrial grade

              Spacer (few microns) over   the apertureLarge apertureThin substratesPhase distortions (spherical)Low beam deviation

              Polarization manag. Polarization vision

              Scientific grade

              Low phase distortionsNo beam deviationNo spacers over the   apertureAperture 10 mmThick substratesBroadband AR coating

              InterferometryMetrologyUse in an imaging   plane

              colimated laser beam

              Custom

              Larger apertures.High switching speeds.Large quantities/low price.Zero phase shift

              Custom adapted cells   
               
              for industrial   applicationsSpecific scientific   applications

               

              Principle

              The Arcoptix variable phase retarders are manufactured with standard liquid crystal technology. As depicted in figure 1, they are principally made of a liquid crystal layer sandwiched between two flat glass plates coated with a transparent electrode (ITO) and an alignment layer. The two glass plates are precisely spaced apart with a matrix of glass fibers. The cavity formed by these plates is filled with a special blend of liquid crystals optimized for high birefringence, small temperature dependence and high stability. The cell is hermetically sealed with a polymer frame. The alignment layer is a gently rubbed polyimide layer necessary for the alignment of the LC molecules. The electric field that can be induced by applying a voltage on the transparent ITO electrodes (0-7V) modifies the alignment of the LC molecules and by the same way the apparent retardance of the cell. Figure (a) shows the alignment of the LC molecules when no voltage is applied. In this case the molecules are aligned along the glass plates and the retardance (along the optical axis) is maximum. Figure (c) shows the other extreme case where a “high” voltage (7V) is applied and the electric field forces the LC molecules to align perpendicularly to the glass plates (parallel to the electric field). Figure (b) shows an intermediate state where we apply a small voltage of about 3V. In this case the molecules have an oblique orientation and the apparent retardation is somewhere in between the maximum retardation (several times the wavelength) and the minimum retardation (almost zero).


               

               

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