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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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