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    • BBO（β相偏硼酸鋇晶體)
     
    BBO（β相偏硼酸鋇晶體)

     

    BBO晶體是一種新型的紫外倍頻晶體，具有較大的相位匹配范圍以及較寬的透過波段，其倍頻轉(zhuǎn)換效率比較高，并具有很高的激光損傷閾值。應(yīng)用：激光倍頻、光參量放大、電光調(diào)Q等。由于BBO具有較低的潮解性，我們使用了一種有效的保護(hù)鍍膜(P-coating)來防止晶體受潮。

    Advantages of BBO Crystals

    • Broad phase-matching range from 409.6 nm to 3500 nm
    • Wide optical transmission from 190 nm to 3500 nm
    • Large effective second-harmonic-generation (SHG) coefficient
    • High damage threshold of 10 GW/cm2 for 100 ps pulse-width at 1064 nm
    • Wide temperature-bandwidth of about 55℃
    • Good mechinical and physical properties

    Capabilities:

    Aperture:
    2x2 ~ 25x25mm
    Lenght:
    0.01 - 25mm
    Cutting Angle of BBO Crystals
    And:
    Determined by different kinds of homonic generartion
    Phase matching type:
    Type I or Type II
    End Configuration:
    Plano/Plano or Brewst/Brewst or Specified

    Specifications of BBO Crystals

    Angle tolerance:
    Δθ< ± 0.5°; Δφ< ±0.5°
    Dimensional Tolerance:
    (W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm)
    Flatness:
    <λ/8 at 633nm
    Surface Quality:
    10/5 S/D
    Parallelism:
    < 20 arc seconds
    Perpendicularity:
    < 5 arc minutes
    Wavefront Distortion:
    <λ/8 at 632.8nm
    Clear Aperture:
    Central 95%
    Chamfer:
    0.15x45°
    Coating:
    * Protective coating is required to prevent polished surfaces from fogging.
    * Anti-reflective coating should be considered if low reflectivity is required.

    Properties of BBO Crystal:

    Sellmeier Equations:

    no2(l) = 2.7359+0.01878/(l2-0.01822)-0.01354 l2
    ne2(l) = 2.3753+0.01224/(l2-0.01667)-0.01516 l2


    BBO optical properties:

    Transparence range: 189-3500nm


    Second harmonic generation (SHG) range: 410-2400nm
    Type I phase matching plane: X-Z plane, f=0o
    Type I phase matching plane: X-Z plane, f=30o

    The c, , , , , rystals , , , , , , , with different angle cut for various applications are listed as follows:

    1) Harmonic generations of Nd:YAG lasers:


    1064nm SHG --> 532nm: 4x4x7mm Type I , q=22.8??, f=0o;
    1064nm THG --> 355nm: 4x4x7mm Type I, q=31.3o, f=0o; Type II q=38.6o, f=30o
    1064nm 4HG --> 266nm: 4x4x7mm Type I, q=47.6o, f=0o;
    1064nm 5HG --> 213nm: 4x4x7mm Type I, q=51.1o, f=0o;

    2) OPO and OPA pumped by harmonics of Nd:YAG lasers


    532nm Pump --> 680-2600nm: 8x6x12mm Type I, q=21o, f=0o;
    355nm Pump --> 410-2600nm: 8x6x12mm Type I, q=30o, f=0o; Type II, q=37o, f=30o;
    266nm Pump --> 295-2600nm: 8x6x12mm Type I, q=39o, f=0o;

    3) Frequency doubling of dye lasers


    670-530nm SHG --> 335-260nm: 8x4x7mm Type I, q=40o, f=0o;
    600-440nm SHG --> 300-220nm: 8x4x7mm Type I, q=55o, f=0o;
    444-410nm SHG --> 222-205nm: 8x4x7mm Type I, q=80o, f=0o;

    4) Harmonic generations of Ti:Sapphire lasers


    700-1000nm SHG --> 350-500nm: 5x5x0.2mm Type I, q=28o, f=0o;
    700-1000nm THG --> 240-330nm: 5x5x0.2mm Type I, q=42o, f=0o;
    700-1000nm FHG --> 210-240nm: 5x5x0.2mm Type I, q=66o, f=0o;

    5) Frequency doubling and tripling of alexandrite lasers


    720-800nm SHG --> 360-400nm: 6x4x7mm Type I, q=31o, f=0o;
    720-800nm THG --> 240-265nm: 6x4x7mm Type I, q=48o, f=0o;

    6) Intracavity SHG of Ar+ laser with brewster angle cut BBO


    514nm SHG --> 257nm: 4x4x7mm Type I, q=51o, f=0o, B-cut;
    488nm SHG --> 244nm: 4x4x7mm Type I, q=55o, f=0o, B-cut;

    Mounting: In order to prevent crystals from damaging or to be easily operated, MT-Optics provide three kinds of mount of holder to install different dimension crystals. Please contact our sales for more information. 

     

    Part No.
    Size(mm)
    Type
    Θ
    Φ
    Coating
    BBO001
    4x4x7
    I
    22.8°
    0°
    AR/AR@1064&532nm
    BBO002
    4x4x7
    I
    47.6°
    0°
    AR/AR@532&266nm
    BBO003
    4x4x10
    I
    22.8°
    0°
    AR/AR@1064&532nm
    BBO004
    4x4x10
    I
    47.6°
    0°
    AR/AR@532&266nm
    BBO005
    5x5x2
    I
    29.2°
    0°
    AR/AR@800&400nm
    BBO006
    5x5x1
    I
    29.2°
    0°
    AR/AR@800&400nm
    BBO007
    5x5x0.3-0.5
    I
    29.2°
    0°
    AR/AR@800&400nm
    BBO008
    5x5x0.1
    I
    29.2°
    0°
    AR/AR@800&400nm

    Crystal Structure
    trigonal, space group R3c
    Cell Parameters
    a = b = 12.532?, c = 12.717?, Z = 6
    Melting Point
    1095 +/-5°C
    Transition Temperature
    925 +/-5°C
    Optical Homogeneity
    Dn≈10-6/cm
    Mohs Hardness
    4.5
    Density
    3.85 g/cm3
    Absorption Coefficient
    < 0.1%/cm (at 1064 nm)
    Hygroscopic Susceptibility
    low
    Resistivity
    > 1011 ohm-cm
    Relative Dielectric Constant
    T11/ 0: 6.7, T33/ 0: 8.1
    Tan ?, < 0.001
    Thermal Expansion Coefficients(in the range of 25℃- 900℃)
    a, 4 x 10-6/K
    c, 36 x 10-6/K
    Thermal Conductivity
    ^c, 1.2 W/m/K; ||c, 1.6 W/m/K

    Phase-matchable SHG range
    205nm-1750nm
    NLO coefficients
    d11 = 5.8 x d36(KDP)
    d11 = 0.05 x d11, d22< 0.05 x d11
    Electro-Optic Coefficients
    g11 = 2.7 pm/V, g22, g31< 0.1 g11
    Half-Wave Voltage
    48 KV (at 1064 nm)
    Damage Threshold
    at 1.064 mm
    at 0.532 mm
    5 GW/cm2 (10 ns);
    10 GW/cm2 (1.3 ns)1 GW/cm2 (10 ns);
    7 GW/cm2 (250 ps)
    Transparency Range
    189 - 3500 nm
    Refractive Indices
    at 1.0642 mm
    at 0.5321 mm
    at 0.2660 mm

    ne = 1.5425, no = 1.6551
    ne = 1.5555, no = 1.6749
    ne = 1.6146, no = 1.7571
    Therm-Optic Coefficients
    dno/dT = - 9.3 x 10-6/℃
    dne/dT = -16.6 x 10-6/℃

     

    Note: Other sizes, cut angle, coating are available upon request.


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