There are four chemical values of V element: + 2, + 3, + 4 and + 5. The V3 + ions with + 3 valence are commonly used Q-switch and saturable absorbent ions, which are doped into YAG matrix crystals to realize the passive Q-switch and mode-locking of laser. V:YAG crystal is a new material of laser saturable absorber and passive Q-switch in wavelength range of 1.06μm-1.44 μ m. It is especially suitable for neodymium laser of 1. 3 μ m. It is an excellent saturable absorber material in wave band of 1. 3m. In the passively Q-switch solid-state laser, the laser has the advantages of good stability, long lifetime, miniaturization, simplicity and practicality.
| Property | Value |
| Chemical Formula | V3+:Y3Al5O12 |
| Crystal structure | cubic – la3d |
| Orientation | <100> <+/-0.5° |
| Transmittance | 30%-97% |
| Optical density | 0.1-0.8 |
| Atomic transition structure | Two-level system |
| Recovery time | 5~22 ×10-22 s |
| Concentrations | (0.05~0.35) wt% |
| Ground-state absorption cross-section | 7.2 x 10-18 cm2 |
| Excited-state absorption cross-section | 7.4 x 10-19 cm2 |
| Emission bandwidth | 1000-1450 nm |
| Central absorption wavelength | 1300 nm |
| Coatings | Standard coating is AR with R < 0.2%(@1340 nm) |
| Absorption coefficient | 1.0cm-1 – 7.0cm-1 |
| Damage threshold | >500MW/cm2 |
| Property | Value |
| Orientation Tolerence | < 0.5° |
| Thickness/Diameter Tolerance | ±0.05 mm |
| Surface Flatness | <λ/8@632 nm |
| Wavefront Distortion | <λ/4@632 nm |
| Surface Quality | 10/5 |
| Parallel | 30〞 |
| Perpendicular | 15ˊ |
| Clear Aperture | >90% |
| Chamfer | <0.2×45° |
| HR coating | <= 0.2% (@ 1340nm) |
Long upper level life
Excited state absorption
High saturation at 1.3μm
High damage threshold
Short recovery time
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