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Beta-Barium Borate ( -BaB2O4 ) or ( BBO )

 

Structural and Physical Properties

Crystal Structure .

Trigonal, space group R3c

Cell Parameters

A = b = 12.532

C = 12.717

Z = 6

Melting Point

1095 5C

Transsition temperature

925 5C

Optical homogeneity

δddn ≈ 10-6 /cm

Mohs Hardness

4

Density

3.85 g/cm

Absorption Coefficient

< 0.1 %/cm ( at 1064 nm )

Specific hea:

1.91 J/cm x K

Hygrocopic susceptibility

Low

Thermal expansion Coefficients.

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

Linear Optical Properties

Transparency range

189 3500 nm

Refractive indices

at 1064 nm

ne = 1.5425

no = 1.6551

at 532 nm

ne = 1.5555

no = 1.6749

at 266 nm

ne = 1.6146

no = 1.7571

Therm optic Coefficients.

dno / dt = -9.3 x 10-6 /C

dne / dt = -16.6 x 10-6 /C

Nonlinear Optical Properties

Phase matchable output Wavelenghts

189 1750 nm

NLO Coefficients

d11 = 5.8 x d36 (KDP)

d31 = 0.05 x d11

d22 = 0.05 x d11

Electro Optic Coefficients

γ??11 = 2.7 pm/V, γ??22, γ??31 <0.1 γ??11

Half wave voltage

48 KV (at 1064 nm)

Damage threshold

at 1064 nm

5 GW / cm
(10 ns)

10 GW / cm
(1.3 ns)

at 532 nm

1 GW / cm
(10 ns)

7 GW / cm
(250 ns)

 

List of Optical Crystals

Materials

Refractive Index

Transmission
Range (mm)

Density
(g/cm)

Thermal Expansion 
Coefficient (10-6/K) 

BK7 glass

1.5164 (588 nm)

0.330 2.1

2.51

7.5 

SF11 glass

1.78472 (588 nm)

0.370 2.5

4.74

6.8 

F2 glass

1.62004 (588 nm)

0.420 2.0

3.61

8.2 

Fused Silica

1.4858 (308 nm)

0.185 2.5

2.20

0.55 

CaF2

1.399  (5.0 mm)

 0.170 7.8

 3.18

 18.85 

BaF2

 1.460 (3.0 um)

 0.15 12.0

 4.88

 18.4 

Sapphire

1.755 (1.0mm)

0.180 4.5

3.98

8.4 

Silicon

3.4179 (10mm)

 1.200 7.0

 2.33

 4.15 

Ge

4.003 (10 mm)

 1.900 16

 5.33

 6.1 

ZnSe

2.40  (10 mm)

0.630 18

5.27

7.8 

ZnS

2.2 (10mm)

0.380 14

4.09

6.5 

LiF

1.39 (500 nm)

 0.150 5.2

 2.64

37 

KBr

1.526 (10 mm)

 0.280 22

 2.75

43 

 MgF2

no =  1.3836  ne = 1.3957 (405 nm)

0.130 7.0

7.37

a: 13.7         b: 8.48 

YVO4

no = 1.9500  ne = 2.1554 (1.3 mm)

0.400 5.0

4.22

a: 4.46       b: 11.37 

Calcite

no =  1.6557  ne = 1.4852 (633 nm)

0.210 2.3

2.75

a: 24.39        b: 5.68 

Quartz

no =  1.5427  ne = 1.5518 (633 nm)

0.200 2.3

2.65

7.07 

α-BBO

no =  1.6749  ne = 1.5555 (532 nm)

0.190 3.5

3.85

a: 4.0           c: 36 

LiNbO3

no =  2.2863 ne = 2.2027 (633 nm)

0.370 4.5

4.64

a: 16.7          c: 2.0 

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