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| BBO Crystal(Barium Borate): |
| Basic Properties: |
|
| 1. Structural
and Physical Properties |
|
| Chemical formula |
β-BaB2O4 |
| Crystal structure |
trigonal，space group R3c |
| Cell parameters |
a=b=12.532A, c=12.717A Z=6 |
| Melting point |
1095±5? |
| Transition temperature |
925±5? |
| Optical homogengity |
△n≈10-6/cm |
| Mohs hardness |
4.5 |
| Density |
3.85g/cm3 |
| Linear absorption coefficients |
a<0.001cm-1 (λ=1064nm) |
| a<0.01cm-1 (λ=532nm) |
| a<0.5cm-1 (λ=2550nm) |
| Hygroscopic susceptibility |
Low |
| Resistivity |
＞1011Ω-cm |
| Relative dielectric constant |
eT11 /e0:6.7,
eT33 /e0:8.1,
Tan δ<0.001 |
| Thermal expansion coefficients |
a, 4×10-6/K c, 36×10-6/K |
| (in the range of 25?-900?) |
| Thermal conductivity |
?c, 1.2w/m/k; ?c, 1.6w/m/k; |
| 2. Linear
Optical Properties |
|
| Transparency range: |
| 189-3500nm.see transparency curve |
| Refractive indices |
| At 1.0642 |
μm |
ne=1.5425, |
no=1.6551 |
| At 0.5321 |
μm |
ne=1.5555, |
no=1.6749 |
| At 0.2660 |
μm |
ne=1.6146, |
no=1.7571 |
|
| Therm-optic coefficients: |
|
| dno/dT=-9.3×10-6/? |
dne/dT=-16.6×10-6/? |
|
| Sellmeier equations: |
|
| N2o(λ)=2.7359+0.01878/(λ2-0.01822)-0.01354×λ2
(λ in μm, T= 20?) |
| N2e(λ)=2.3753+0.01224/(λ2-0.01667)-0.01516×λ2
(λ in μm, T= 20?) |
| 3. Nonlinear
Optical Properties |
|
| Phase-matchable output range: 189-1750nm |
|
| NLO coefficients: |
d11=5.8×d36(KDP) |
| |
d 31=0.05×d11, d22<0.05×d11 |
| Electri-optic coefficients: |
γ11=2.7pm/V, γ22,γ31<0.1γ11 |
| Half-wave voltage: |
48KV(at 1064 nm) |
| Damage threshold: |
| At 1.064 |
μm |
5GW/cm2(10ns); |
10GW/cm2(1.3ns); |
| At 0.532 |
μm |
1GW/cm2(10ns); |
7GW/cm2(250ps); |
| At 0.266 |
μm |
120MW/cm2(8ns). |
|
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