Er, Yb:phosphate glass
Main features
- Long lifetime of the 4I13/2 erbium energy level
- High Yb to Er energy transfer efficiency
- High absorption and emission cross-sections
- Wide absorption and emission bandwidths
- Custom crystals available upon request
Application examples
- Passively Q-switched lasers for laser rangefinders, LIDAR, and LIBS systems
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- Description
- Properties
- Absorption and emission curves
- Standard specifications
Er3+, Yb3+ co-doped phosphate glass (Er, Yb:phosphate glass) is a well-known and commonly used active medium for lasers emitting in the “eye-safe” spectral range of 1,5-1,6 µm. Phosphate glass combines a long lifetime (~8 ms) of 4I13/2 Er3+ upper laser level with a low (2–3 ms) lifetime of 4I11/2Er3+ level that is in resonance with Yb3+ 2F5/2 excited state. Fast non-radiative multi-phonon relaxation from 4I11/2 to 4I13/2 level greatly decreases the back-energy transfer and up-conversion losses due to the interaction between Yb3+ and Er3+ ions, excited at the 2F5/2 and the 4I11/2 levels, respectively.
| Spectroscopic and thermo-mechanical properties | |
|---|---|
| Absorption peak wavelength | 970 nm |
| Absorption cross-section at a peak wavelength | 1,7×10-20 cm2 |
| Absorption bandwidth at a peak wavelength | 20 nm |
| Laser wavelength | 1534 nm |
| Lifetime of 4I13/2 erbium energy level | 7,9 ms |
| Emission cross-section @1534 nm | 8 × 10-21 cm2 |
| Yb to Er energy transfer efficiency | >90 % |
| Refractive index @1534 nm | 1,52 |
| Crystal structure | - |
| Density | 2,93 g/cm3 |
| Mohs hardness | 6-7 |
| Thermal conductivity | 0,85 Wm-1K-1 |
| dn/dT | -2,1 × 10-6 K-1 |
| Thermal expansion coefficient | 12,4 × 10-6 K-1 |
| Typical doping level | 0,3-1,3 × 1020 cm-3 [Er] 1,7-4 × 1021 cm-3 [Yb] |
| Er, Yb:phosphate glass crystals | |
|---|---|
| Clear aperture | >90% |
| Face dimensions tolerance | +0,0/-0,1 mm |
| Length tolerance | ±0,1 mm |
| Parallelism error | <10 arcsec |
| Perpendicularity error | <10 arcmin |
| Protective chamfers | <0,1 mm at 45˚ |
| Surface quality | 10-5 S-D |
| Surface flatness | <λ/10@632,8 nm |
| Coatings | AR(R<0,5%)@940 nm + AR(R<0,2%)@1535 nm on both faces |
| Laser-induced damage threshold | >10 J/cm2@1535 nm, 10 ns |
| Mount | Unmounted |
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Face dimensions
Length
End faces
Doping
Coatings
SKU
PRICE
QUANTITY
3x3 mm
10 mm
Right angle cut
Yb 20% Er 0,5%
AR/AR@940 nm + 1535 nm
7821
Request
3x3 mm
10 mm
Brewster cut
Yb 20% Er 0,5%
uncoated
7822
Request
3x3 mm
5 mm
Right angle cut
Yb 20% Er 1%
AR/AR@940 nm + 1535 nm
7823
Request
3x3 mm
5 mm
Brewster cut
Yb 20% Er 1%
uncoated
7824
Request
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