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首页 Optical Accessories Optical Components Optical window panel IR polished Al2O3 circular sapphire window panel 0.17-5.5um (Al2O3 window panel) IR Polished Al2O3 Circular Sapphire Window 0.17-5.5μm 25.4x1.0m

    • IR Polished Al2O3 Circular Sapphire Window 0.17-5.5μm 25.4x1.0m

    Sapphire (Al2O3) is highly regarded for its extreme toughness and strength, making it an ideal material for optical windows across the UV, VIS, and NIR spectral ranges. Sapphire can be grown using different methods. The Verneuil and Czochralski processes are commonly used for standard-grade sapphire materials. Higher-quality sapphire, used for electronic substrates, is typically grown by the Kyropulos method, offering exceptionally high purity and excellent UV transmission properties. In the IR spectrum, sapphire's use is generally limited to around 5μm, with few issues encountered at optical grades. In the UV range, care must be taken when observing its transmission from 140nm to 240nm, as it is highly sensitive to impurities and voids. Large sapphire crystals can be made by color-band growth. Sapphire exhibits slight birefringence, and IR windows are typically cut randomly from the crystal. For specific birefringence applications, an orientation can be selected, where the optical axis is at a 90-degree angle to the surface, referred to as "zero-degree" material. Synthetic optical sapphire is colorless. *Note: Actual thermal expansion values may vary across manufacturers.

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    主要参数
  • 核心参数

  • 尺寸图

    • General Parameters

    Transmission Range

    0.17~5.5μm

    Refractive Index

    No 1.75449; Ne 1.74663（1.06μm）（1）

    Reflection Loss

    14％ at 1.06μm

    Absorption Coefficient

    0.3×10-3cm-1 at 2.4μm（2）

    Absorption Peak

    13.5μm

    dn / dT：

    13.4×10-6（0.546μm）（3）

    dn /dμ= 0：

    1.5μm

    Density

    3.97g/cm3

    Melting Point

    2040℃

    Thermal Conductivity

    27.21W m-1 K-1 at 300K

    Thermal Expansion

    5.6（para）& 5.0（perp）×10-6 / K *

    Hardness

    Knoop 2000 with 2000g indenter

    Specific Heat Capacity

    763JKg-1 K-1（293K）（4）

    Dielectric Constant

    11.5（para）9.4（perp）at 1MHz

    Young's Modulus (E)

    335GPa

    Shear Modulus (G)

    148.1GPa

    Bulk Modulus (K)

    240GPa

    Elastic Modulus

    C11 = 496 C12 = 164 C13 = 115 C33 = 498 C44 = 148

    Apparent Elastic Limit

    300 MPa（45,000 psi）

    Poisson’s Ratio

    0.25

    Solubility

    98×10-6g / 100g water

    Molecular Weight

    101.96

    Class/Structure：（hex），R3c

    Trigonal（hex），R3c

     

    Spectral Transmission Curve

     


    Refractive Index No = Ordinary Ray，Ne = Extraordinary Ray)

    um

    No

    Ne

    um

    No

    Ne

    um

    No

    Ne

    0.193

    1.9288

    1.9174

    0.213

    1.8890

    1.8784

    0.222

    1.8754

    1.8650

    0.226

    1.8702

    1.8599

    0.244

    1.8506

    1.8407

    0.248

    1.8470

    1.8372

    0.257

    1.8393

    1.8297

    0.266

    1.8330

    1.8236

    0.280

    1.8244

    1.8151

    0.308

    1.8110

    1.8020

    0.325

    1.8047

    1.7958

    0.337

    1.8001

    1.7921

    0.351

    1.7969

    1.7882

    0.355

    1.7960

    1.7883

    0.442

    1.7804

    1.7721

    0.458

    1.7784

    1.7702

    0.488

    1.7753

    1.7671

    0.515

    1.7730

    1.7649

    0.532

    1.7717

    1.7636

    0.590

    1.7680

    1.7600

    0.633

    1.7659

    1.7579

    0.670

    1.7643

    1.7563

    0.694

    1.7634

    1.7554

    0.755

    1.7614

    1.7535

    0.780

    1.7607

    1.7527

    0.800

    1.7601

    1.7522

    0.820

    1.7596

    1.7517

    0.980

    1.7561

    1.7482

    1.064

    1.7545

    1.7466

    1.320

    1.7501

    1.7423

    1.550

    1.7462

    1.7384

    2.010

    1.7375

    1.7297

    2.249

    1.7323

    1.7243

    2.703

    1.719

    1.711

    2.941

    1.712

    1.711

    3.333

    1.701

    1.693

    3.704

    1.687

    1.679

    4.000

    1.674

    1.666

    4.348

    1.658

    1.65

    4.762

    1.636

    1.628

    5.000

    1.623

    1.615

    5.263

    1.607

    1.599

     62d63f24b7b71.jpg


    Ordering Info 

    PN#

    Specifications（D×L）

    Orientation

    Application Range

    SAPP10-2

    10.0×2.0mm

    Random

    IR

    SAPP12-1

    12.0×1.0mm

    Random

    IR

    SAPP12-2

    12.0×2.0mm

    Random

    IR

    SAPP12-4

    12.0×4.0mm

    Random

    IR

    SAPP15-2

    15.0×2.0mm

    Random

    IR

    SAPP18-4

    18.0×4.0mm

    Random

    IR

    SAPP20-2

    20.0×2.0mm

    Random

    IR

    SAPP25-0.5

    25.0×0.5mm

    Random

    IR

    SAPP25-1

    25.0×1.0mm

    Random

    IR

    SAPP25-2

    25.0×2.0mm

    Random

    IR

    SAPP25.4-1

    25.4×1.0mm

    Random

    IR

    SAPP26-1

    26.0×1.0mm

    Random

    IR

    SAPP35-2

    35.0×2.0mm

    Random

    IR

      

    About Crystal Cutting

    Sapphire is slightly birefringent and so for critical optical or mechanical applications, the windows should be specified as 'zero degree', or 'c-cut', meaning that the optical axis of the material should be perpendicular to the plane of the window. Ifunspecified, the component will be of'random' cut, but its worth noting that this is nearly always 60° to the optic axis as this is the 'softest' direction for the saw. Note that all sapphire is always single crystal, sub-grains are always avoided in the cut.

     图片1.png 

    C-plane (0,0,0,1) = Z-cut  

    A-plane (1,1,-2,0) = Y-cut

    M-Plane (1,0,-1,0) = X-cut R-Plane (1,0,-1,0)

    Manufacturers seem unable to agree on the thermal expansion coefficient of sapphire, figures from 5.6 to 8.4 x 10-6 K are given. While there may be some variation due to the method of growth, and certainly due to the axis of cut, this variation is inexplicable.

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