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    液晶相位延迟器
    The LC Variable Phase Retarder
    商品货号:ECS002181
    商品品牌:Arcoptix
    详细介绍

    液晶相位延迟器

    液晶相位延迟器是通过电压控制液晶分子的折射率来实现对光的相位延迟。能够精确调控特定波长的相位延迟量。

    提供多种规格的产品,分别适用于工业和科研等领域的需要,亦可根据客户需要定制产品。

     

    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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