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Beta Barium Borate (BBO), is widely used non-linear optical material with an excellent range of properties making useful across a broad range of applications.


BBO strengths include:



BBO applications include:











BBO Crystal Properties


Linear Optical Properties

Units

Value

Transmission/Transparency Range

µm

0.189 - 3.50

 Optical Homogeneity

cm¹

δn ~ 10‾⁶

Refractive Index (n) @213nm


n= 1.8465

ne = 1.6742

                                 @266nm


n= 1.7571

ne = 1.6139

                                 @355nm


n= 1.7055

ne = 1.5775

                                 @532nm


n= 1.6750

ne = 1.5555

                                 @1064nm


n= 1.6551

ne = 1.5426

Absorption Coefficient @1.06µm

cm¹

<0.1

                                     @2.5µm

cm¹

TBA

                                     @5.0µm

cm¹

N/A

                                     @7.5µm

cm¹

N/A

                                     @10.0µm

cm¹

N/A

                                     @11.0µm

cm¹

N/A

 Thermo-optic Coefficients

 10‾⁶/ºC

dn₀/dt = -9.3 dne/dt  = -16

Physical / Thermal Properties

Units

Value

 Chemical Formula


BaB₂O₄

 Crystal Symmetry


Trigonal

 Space Group


R3c

 Point Group


3m

 Cell Parameters


a = b=12.532Å

c=12.717Å

z=6

Melting Point

ºC

1095

 Thermal Expansion Coeff. @20ºC

 10‾⁶/ºC

a: 4

b: 36

Thermal Conductivity Coeff. @20ºC

W/m/ºK

┴  1.2

║   1.6

 Specific Heat

 cal/g K

0.497

 Density  

g/cm³

3.85

 Mohs Hardness


4.5

 Optical Damage Threshold @1.064/ºC,10ns

MW/cm²

5000

BBO Crystal - Availability


                      

  








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BBO Non-linear Crystals


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BBO Crystal - Sellmeier Equations


 n²(λ) = 2.7359 + 0.01878 / (λ² - 0.01822) - 0.01354lλ²

 ne²(λ) = 2.3753 + 0.01224 / (λ² - 0.01667) - 0.01516λ²

                       

  








Nonlinear Optical Properties


NLO Coefficients

d₁₁ = 5.8 x d₃₆ KDP

d₃₁ = 0.05 x d₁₁

d₂₂ < 0.05 x d₁₁

 Effective Nonlinearity Expressions

TBA


Electro-optic Coefficients

y₁₁ = 2.7 pm/V

y₂₂ <  0.1 x y₁₁

y₃₁ <  0.1 x y₁₁

 Half-wave Voltage

48 kV @ 1064nm                                    @10.0µm

Standard Applications/Cuts

Type

θº

φº

SHG@800nm/400nm

I

29.2

90

THG@800nm/266nm

I

44.3

90

SHG@1030nm/515nm

I

23.4

90

4HG@1064nm/266nm

I

47.6

90