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Birefringent Crystals
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 | Negative Uniaxial | Positive Uniaxial | Positive Uniaxial |
| Crystal Cell | a =b= 0.515Å, c= 13.863Å | a = 4.621Å, c= 3.053Å | |
| 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 |