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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,其倍頻轉換效率比較高,并具有很高的激光損傷閾值。應用:激光倍頻、光參量放大、電光調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°
      AR/AR@1064&532nm
      BBO002
      4x4x7
      I
      47.6°
      AR/AR@532&266nm
      BBO003
      4x4x10
      I
      22.8°
      AR/AR@1064&532nm
      BBO004
      4x4x10
      I
      47.6°
      AR/AR@532&266nm
      BBO005
      5x5x2
      I
      29.2°
      AR/AR@800&400nm
      BBO006
      5x5x1
      I
      29.2°
      AR/AR@800&400nm
      BBO007
      5x5x0.3-0.5
      I
      29.2°
      AR/AR@800&400nm
      BBO008
      5x5x0.1
      I
      29.2°
      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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