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Birefringent Crystals
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Overview
| Birefringent Crystals |
YVO4 |
Calcite |
a -BBO |
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| Physical and Optical Properties |
| Transparency Range |
400~5000nm |
350~2300nm |
189~3500nm |
| Crystal Structure |
Trigonal, space group R3c |
Trigonal, space group R 3c |
Trigonal, space group R3c |
| Crystal Class |
Positive uniaxial |
Positive uniaxial |
Negative Uniaxial |
| Crystal Cell |
a =b= 7.12Å, c= 6.29Å |
a =b= 4.621Å, c= 3.053Å |
a=b=12.532Å, c=12.717Å |
| Density |
4.22 g/cm3 |
3.18 g/cm3 |
3.85g/cm3 |
| Hygroscopic Susceptibility |
Low |
Low |
Low |
| Mohs Hardness |
5 |
6 |
4.5 |
| Thermal Expansion Coefficients |
aa=4.43x10-6/k
ac=11.37x10-6/k |
aa=6.23-9.25 x 10-6 /k
ac=10.86-14.54 x 10-6 /k |
aa=4 x 10-6 /k
cc=36 x 10-6 /k |
| Optical Homogeneity |
10-6 /cm |
10-6 /cm |
10-6/cm |
| Absorption Coefficient |
0.05%/cm-1 @1064nm |
0.07@200nm 0.02@500nm |
0.05%/cm-1 @1064nm |
| Refractive Index, Birefringence(Δn = ne - no)
and Walk-Off Angle at 45 deg(ρ) |
ne = 2.2154, no = 1.9929,
Δn=0.2251,
ρ=6.042°@ 633nm |
ne = 1.48520, no = 1.65578
Δn=0.17058,
ρ=6.205°@ 633nm |
ne = 1.67056, no = 1.54831,
Δn=0.1222;
ρ=4.345°@ 532nm |
| Capabileties |
| Diameter |
Max. 30~40mm |
Max. 150 |
Max. 40~50mm |
| Length |
Max. 25~35mm |
Max. 100 |
Max. 25~35mm |
| Surface Quality |
Better than 20/10 scratch/dig
Per MIL-0-13830A |
Better than 20/10 scratch/dig
Per MIL-0-13830A |
Better than 20/10 scratch/dig Per MIL-0-13830A |
| Beam Deviation |
<10 arc second |
<10 arc second |
<10 arc second |
| Optical Axis Orientation |
+/-0.2° |
+/-0.2° |
+/-0.2° |
| Flatness |
<λ/8 @633nm |
<λ/8 @633nm |
<λ/8 @633nm |
| Transimission Wavfront Distortion |
<λ/4 @633nm |
<λ/4 @633nm |
<λ/4 @633nm |
| Coating |
upon specification |
upon specification |
upon specification |
| Birefringent Crystals |
LiNbO3 |
MgF2 |
Quartz |
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| Physical and Optical Properties |
| Transparency Range |
420 ~ 5200 nm |
0.12~8.5nm |
200~2300nm |
| Crystal Structure |
Trigonal, space group R 3c |
Trigonal, space group R 3c |
Trigonal, space group R 3c |
| Crystal Class |
Positive Uniaxial |
Positive Uniaxial |
Negative Uniaxial |
| Crystal Cell |
a =b= 0.515Å, c= 13.863Å |
a =b= 4.621Å, c= 3.053Å |
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| Density |
4.64 g/cm3 |
3.18 g/cm3 |
2.65 g/cm3 |
| Hygroscopic Susceptibility |
Low |
Low |
Low |
| Mohs Hardness |
5 |
6 |
7 |
| Thermal Expansion Coefficients |
aa=2.0 x 10-6 /k @ 25°C
cc=2.2 x 10-6 /k @ 25°C |
ac= 10.86-14.54x10-6/k
aa= 6.23-9.25x10-6/k |
aa=6.2x10-6/k
ac=10.7x10-6/k |
| Optical Homogeneity |
~ 5 x 10-5 /cm |
10-6/cm |
10-6/cm |
| Absorption Coefficient |
0.1%/cm @ 1064 nm |
0.07 at 0.2 µm;0.02 at 5.0 µm |
0.1%/cm @ 1064 nm |
| Refractive Index, Birefringence(Δn = ne - no)
and Walk-Off Angle at 45 deg(ρ) |
ne = 2.20263, no = 2.28629
Δn=0.08366,
ρ=2.135°@ 633nm |
Ne = 1.38876, no = 1.37698
Δn=0.01178,
ρ=0.488°@ 633nm |
ne = 1.55170, no = 1.54265
Δn=0.00905,
ρ=0.335°@ 633nm |
| Capabileties |
| Diameter |
max. 30~40 |
max. 50mm |
max. 100mm |
| Length |
max. 25~35mm |
max. 100mm |
max. 100mm |
| Surface Quality |
better than 20/10 scratch/dig Per MIL-0-13830A |
better than 20/10 scratch/dig Per MIL-0-13830A |
better than 20/10 scratch/dig Per MIL-0-13830A |
| Beam Deviation |
<10 arc second |
<10 arc second |
<10 arc second |
| Optical Axis Orientation |
+/-0.2° |
+/-0.2° |
+/-0.2° |
| Flatness |
<λ/8 @633nm |
<λ/8 @633nm |
<λ/8 @633nm |
| Transimission Wavfront Distortion |
<λ/4 @633nm |
<λ/4 @633nm |
<λ/4 @633nm |
| Coating |
upon specification |
upon specification |
upon specification |
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