Yb:YAG Crystals
Yb:YAG is a laser crystal formed by doping trivalent ytterbium ions (Yb3+) into a yttrium aluminum garnet (YAG) matrix to generate a 1.03um near-infrared laser. It belongs to the same matrix as Nd:YAG, but due to doping The growth process is different due to the difference.
Ytterbium-doped YAG has a high quantum efficiency (91%), simple crystal spectrum, no excited state absorption and upconversion, and no fluorescence concentration quenching, high doping concentration (up to 30 at.%), and longer fluorescence lifetime. (0.91ms), the absorption band bandwidth (18nm) is much wider than that of Nd:YAG (<4nm), which can be effectively coupled with the pump wavelength of the diode.
Under the same input power, the heat generation of Yb:YAG pump is only 1/4 of that of Nd:YAG. Moreover, YAG matrix has the best comprehensive properties of physicochemical properties, so Yb:YAG has become one of the most attractive solid-state laser media.
LD-pumped high-power Yb:YAG solid-state lasers have become a new research hotspot, and are regarded as a major direction for the development of high-efficiency, high-power solid-state lasers.
Yb:YAG(Ytterbium-doped Yttrium Aluminum Garnet) is a material that suitable for diode-pumping high power lasers. Yb3+:YAG crystals have 950 μs lifetime of 2F5/2 ytterbium energy level and quantum defect of only ~9%. Yb:YAG crystals also have a broad pump band at near 940 nm that is more than 10 times broader than the 808 nm pump line of Nd:YAG crystals. It makes Yb:YAG systems less sensitive to thermal shift of pump diodes wavelength. Yb:YAG lasers emit typically at either 1030 nm (strongest line) or 1050 nm. It is often used in powerful and efficient thin-disk lasers.
Advantages:
- High slope efficiency
- Broad absorption bands, about 8nm@940nm
- Conveniently pumped by reliable InGaAs diodes at 940nm
or 970nm - Very low fractional heating, less than11%
- Broad absorption bands, about 8nm@940nm
- High thermal conductivity and large mechanical strength
- No excited-state absorption or up-conversion
- Yb:YAG is expected to take the place of Nd:YAG for high power diode-pumped lasers.
| wdt_ID | Attributes | Values |
|---|---|---|
| 1 | Yb dopant | 0.5%~25% at% |
| 2 | Orientation | ＜111＞ ±5° |
| 3 | Dimension | φ2~φ20mm, length: up to 150mm |
| 5 | Flatness: | λ/10@632.8nm |
| 6 | Surface Quality: | 10/5(MIL-O-13830A) |
| 7 | Parallelism: | ≤10” |
| 8 | Perpendicularity: | ≤5’ |
| 9 | Wavefront distortion: | ≤0.125λ/inch |
| 10 | Barrel finish: | Ground Finish with 400# Grit |
| 11 | Extinction Ratio | ≥28dB |
| 12 | Coating: | AR/AR@1030nm; R ≤0.25% |
| 13 | Damage threshold | 500MW/cm²10ns 1Hz at 1064nm |
| 14 | Laser wavelength | 1030nm |
| 15 | Pump wavelength of diode | 940nm or 970nm |
| 16 | Pump Absorption band width | 8 nm |
| wdt_ID | Attributes | Values |
|---|---|---|
| 1 | Crystal Structure | Cubic |
| 2 | Laser Transition | ²F₅/₂ → ²F₇ ⁄₂ |
| 3 | Photon Energy | 1.93x10⁻¹⁹J |
| 4 | Emission Line width | 9nm |
| 5 | Emission Cross Section | 2.0 x 10⁻²⁰0cm² |
| 6 | Flourescence lifetime | 1.2 ms |
| 7 | Refractive Index | 1.8197@1030nm |
| 8 | Lattice Parameters | 12.01Å |
| 9 | Melting Point | 1970°C |
| 10 | Hardness | 8.5 |
| 11 | Density | 4.56g/cm³ |
| wdt_ID | Attributes | Values |
|---|---|---|
| 1 | Chemical Formula | Yb3⁺:Y₃AI₅O₁₂ |
| 12 | Thermal Expansion Coefficient | [111]7.8×10⁻⁶/℃(0~250℃) |
| 15 | Thermal Expansion Coefficient | [110]7.7×10⁻⁶/℃(0~250℃) |
| 17 | Thermal Expansion Coefficient | [100]8.2×10⁻⁶/℃(0~250℃) |
| 18 | Thermal conductivity | 14W/m/K(@20℃), 10.5W/m/K(@100℃) |
| 19 | Thermal Optical Coefficient (dn/dT) | 7.3x10⁻⁶/K |
| 24 | Thermal Shock Resistance | 790W/m |
| 25 | Solubility | Water Insoluble |
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Materials processing, micromachining, welding, cutting
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Efficient high power thin-disk lasers
| wdt_ID | SKU | Type of crystals | Dimensions, mm | Coatings, nm |
|---|---|---|---|---|
| 1 | YB0101 | Yb:YAG | 3.5X1.5 | Non-coating |
| 39 | YB0102 | Yb:YAG | 8X1.5 | Non-coating |
| 40 | YB0103 | Yb:YAG | 1.3X4 | AR/AR@1030&940nm |
| 41 | YB0104 | Yb:YAG | 1.3X4 | AR/AR@1030&940nm |
| 42 | YB0105 | Yb:YAG | 5X5X0.1 | S1:AR@1030&940; S2:AR@1030(R＜0.5%)&HR@940nm |
| 43 | YB0106 | Yb:YAG | 4X4X12 | AR/AR@1030(R＜0.2+/-5%)&938(R＜0.3+/-5%) |
| 44 | YB0107 | Yb:YAG | 6X2 | Non-coating |
| 45 | YB0108 | Yb:YAG | 3X10 | AR/AR@930-940nm（R＜0.3%）&1030nm（R＜0.5%） |
| 46 | YB0109 | Yb:YAG | 10X1.0 | S1(∧):HR@1030(R＞99.8%)&HT@968(T＞90%)nm; S2:AR@1030(R＜0.25%)nm |
| 47 | YB0110 | Yb:YAG | 5x5X15 | AR/AR@1030nm(R＜0.2%)&940nm(R＜0.5%) |
| wdt_ID | Part No. | Dimension(mm) | Dopant | S1 Coating | S2 Coating |
|---|---|---|---|---|---|
| 1 | Yb:YAG_1 | 2x2x30 | 1% | AR1030nm+AR940nm | AR1030nm+AR940nm |
| 2 | Yb:YAG_2 | 3x3x4 | 1% | HR1030nm+AR940nm | HR1030nm+AR940nm |
| 3 | Yb:YAG_3 | 3x3x5 | 1% | HR1030nm+AR940nm | AR1030nm, R＜0.25% |
| 4 | Yb:YAG_4 | φ2x30 | 2% | AR1030nm+AR940nm | AR1030nm+AR940nm |
| 5 | Yb:YAG_5 | 5x1x10 | 2% | AR1030nm, R＜0.2% | AR1030nm, R＜0.2% |
| 6 | Yb:YAG_6 | φ1x40 | 1% | AR1030nm+AR940nm | AR1030nm+AR940nm |
| 7 | Yb:YAG_7 | 1x3x10 | 3% | AR1030nm+AR940nm | AR1030nm+AR940nm |
| 8 | Yb:YAG_8 | 3x3x15 | 3% | AR1030nm+AR940nm | AR1030nm+AR940nm |