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    5. Basic knowledge of optical devices: basics of quartz crystals

    Optical DeviceBasic knowledge of optical devices: basics of quartz crystals

    Basic properties of quartz crystals

    The chemical formula for quartz crystals is SiO2. Quartz crystals are trigonal system crystals. Incidentally, quartz glass, which is also SiO2, is amorphous and not crystalline.
    Quartz is a leading piezoelectric. When pressure is applied, electricity is generated. It is a non-ferroelectric polar piezoelectric crystal. Therefore, it does not need polarization processing (aligning the polarity of the charge) like piezoelectric ceramics.
    Quartz is an optically birefringent crystal. It is widely used as a material for waveplates.

    Composition SiO2 (crystal of silicon oxide)
    Crystal system Trigonal system
    Point clouds 32 (rotationally symmetrical structure at 120° on the Z axis and 180° on the X axis)
    Space group P3221 (Right-handed quartz crystal), P3121 (Left-handed quartz crystal)
    Specific gravity 2.65 × 103 kg/m3 (2.65g/cc)
    Mohs' hardness 7 (Harder than ordinary minerals but softer than diamond)
    Melting point 1723 to 1750°C (Phase transition point: 573°C)
    Chemical properties Does not dissolve in anything other than fluorine compounds under normal temperature and pressure
    Dissolves in aqueous solutions (especially alkaline aqueous solutions) under a high temperature and pressure

    Differences between natural quartz crystals and synthetic quartz crystals

    Appearance of natural quartz crystals

    Shape of natural quartz crystals

    Naturally produced stable SiO2 single crystal (Trigonal system crystal)

    Appearance of synthetic quartz crystals

    Shape of synthetic quartz crystals

    Natural quartz crystals have irregular shapes and so are difficult to handle. Synthetic quartz crystals are industrially grown, so they have a certain shape to make them easier to handle.

    Methods and standards for growing synthetic quartz crystals
    Birefringence, optical rotation, and light resistance

    Technical guide

    Please see your required information on operating of our products.

    Strengths of 萝莉影视's optical devices

    We introduce here the high transmittance performance achieved with 萝莉影视's proprietary highly-durable synthetic quartz crystal Pristal and its strengths not found in other companies in waveplates.
    Basics

    We introduce here basic knowledge information on optical products.
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    Avoiding Counterfeit Products

    1. Electronic Components
    2. Optical Device
    3. Basic knowledge of optical devices
    1. HOME
    2. Electronic Components
    3. Optical Device
    4. Basic knowledge of optical devices
    5. Basic knowledge of optical devices: basics of quartz crystals
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