Yb:YAG crystals
Main features
- Simple electronic structure excludes excited-state absorption and also a variety of detrimental quenching processes
- Broad absorption band at 940 nm
- Long lifetime of the 2F5/2 ytterbium energy level
- Low quantum defect
- Custom crystals available upon request
Application examples
- Material processing, micromachining, welding, cutting
- Efficient high power thin-disk lasers
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- Description
- Properties
- Absorption and emission curves
- Standard specifications
Yb3+:YAG crystals feature a 950 us lifetime of the 2F5/2 ytterbium energy level and a quantum defect of only ~9%. Yb:YAG crystals also possess 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.
| Spectroscopic and thermo-mechanical properties | |
|---|---|
| Absorption peak wavelength | 942 nm |
| Absorption cross-section at peak wavelength | 7,7 × 10-21 cm2 |
| Absorption bandwidth at peak wavelength | 18 nm |
| Laser wavelength | 1030 nm |
| Lifetime of 2F5/2 ytterbium energy level | 950 μs |
| Emission cross-section @1030 nm | 2,1 × 10-20 cm2 |
| Refractive index @632,8 nm | 1,83 |
| Crystal structure | Cubic |
| Density | 4,56 g/cm3 |
| Mohs hardness | 8,5 |
| Thermal conductivity | ~13 Wm-1 K-1 |
| dn/dT | 7,8 × 10-6 K-1 |
| Thermal expansion coefficient | 6,2 × 10-6 K-1 |
| Typical doping level | 1-20 at. % |
| Yb:YAG crystals | |
|---|---|
| Orientation | [111] |
| Extinction ratio | >28 dB |
| Clear aperture | >90% |
| Face dimensions tolerance | +0,0/-0,1 mm |
| Length tolerance | ±0,1 mm |
| Parallelism error | <20 arcsec |
| Perpendicularity error | <10 arcmin |
| Protective chamfers | <0,15 mm at 45˚ |
| Surface quality | 10-5 S-D |
| Surface flatness | <λ/10@632,8 nm |
| Wavefront distortion | λ/4@632,8 nm |
| Coatings | AR(R<0,5%)@940 nm + AR(R<0,2%)@1030 nm on both faces |
| Laser induced damage threshold | >10 J/cm2@1030 nm, 10 ns |
| Mount | Unmounted |
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Face dimensions
Length
End faces
Doping
Coatings
SKU
PRICE
QUANTITY
5x5 mm
1 mm
Right-angle cut
10%
AR/AR@940+1030 nm
6659
540 €
5x5 mm
2 mm
Right-angle cut
5%
AR/AR@940+1030 nm
6660
540 €
5x5 mm
10 mm
Right-angle cut
1%
AR/AR@940+1030 nm
6661
540 €
5x5 mm
1 mm
Brewster cut
10%
uncoated
6662
500 €
5x5 mm
2 mm
Brewster cut
5%
uncoated
6663
500 €
5x5 mm
10 mm
Brewster cut
0,7%
uncoated
6664
500 €
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