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Er:Yb:YAB - Er, Yb Co-doped Yttrium Aluminum Borate
- Er:Yb:YAl3(BO3)4 crystal has been considered as an excellent 1.55 µm laser material, because it has high thermal conductivity, high Er3+/Yb3+ energy transfer efficiency and weak upconversion loss.
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Introduction
At present, Er3+ / Yb3+ Co-doped Yttrium Aluminum Borate (Er:Yb:YAl3(BO3)4, Er:Yb:YAB) crystal has been considered as an excellent 1.55 µm laser material, because it has high thermal conductivity, high Er3+/Yb3+ energy transfer efficiency and weak upconversion loss. Compared with Er3+/Yb3+ co-doped phosphato glass, Er:Yb:YAl3(BO3)4 crystal can achieve 1530 nm continuous laser output with high (maximum) power and high slope efficiency. Due to the strong penetration ability to smoke, excellent transparency in atmosphere and high sensitivity for the room-temperature Ge as well as InGaAs photodiodes, eye-safe 1.55 µm laser can be widely used in many applications, such as LiDAR laser ranging, three-dimensional imaging and target recognition.
Table 1. Basic Properties
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Chemical Formula |
Er:Yb:YAl3(BO3)4 |
|
Crystal Structure |
D37 - R32, a = b = 9.293 Å, c = 7.245 Å |
|
Atomic Density |
0.55 × 1020 cm-3 (1at.% Yb3+ or Er3+) |
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Mohs Hardness |
7.5 Mohs |
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Density |
3.7 g/cm3 |
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Refractive Index |
1.75 (no); 1.68 (ne) @1550 nm |
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Thermal Expansion Coefficient |
⊥c: 2.0×10-6 K-1 // c: 9.7×10-6 K-1 (25 at.% Yb3+) |
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⊥c: 1.2×10-6 K-1 // c: 8.5×10-6 K-1 (10 at.% Yb3+) |
|
|
Conductivity |
4.7 W/m/K |
Table 2. Performance Parameter Table
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|
Er:Yb:YAl3(BO3)4 |
Er3+/Yb3+ co-doped phosphate glass |
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Pumping Wavelength |
976 nm |
976 nm |
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Peak Absorption Cross-section |
3 × 10-20 cm2 (σ polarization) |
1 × 10-20 cm2 |
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FWHM of Absorption Band |
19 nm |
10 nm |
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Peak Fluorescence Wavelength |
1530 nm |
1533 nm |
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Central Wavelength of Luminescence |
470 nm |
470 nm |
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Peak Emission Cross-section |
2 × 10-20 cm2 (σ polarization) |
0.8 × 10-20 cm2 |
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Fluorescence Lifetime |
0.3 ms |
8 ms |
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Refraction Index |
1.75 (no) |
1.54 |
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Conductivity |
4.7 W/m/K |
0.8 W/m/K |
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Maximum Output Power |
＞1 W |
350 mW |
|
Maximum Slope Efficiency |
＞30% |
＞30 % |
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Lasing Wavelength |
1520-1600 nm |
1528-1565 nm |
Specifications of Er:Yb:YAB crystal from CASTECH
Table 3. Specifications
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Dopant Concentration |
Er3+: 0.1~3 at.%, Yb3+: 5~30 at.% |
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Cross-section |
(1 × 1) ~ (15 × 15) mm2 |
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Thickness |
0.5~10 mm |
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Dimension Tolerance |
± 0.1 mm |
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Surface Quality (Scratch / Dig) |
10/5 to MIL-PRF-13830B |
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Transmitted Wavefront Distortion |
λ/8 @633 nm |
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Flatness |
λ/6 @633 nm |
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Parallelism |
≦ 30 arc sec |
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Coating |
AR- or HR- coating |
* We can also provide you Er:Yb:GdAl3(BO3)4 and Er:Yb:LuAl3(BO3)4 with similar tech specs above.
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