Advantages:
- High laser efficiency
- Low laser threshold
- Safe for human eye
- High light conversion
Erbium and ytterbium co-doped phosphate glass has a broad application because of the excellent properties. It is the best glass material for 1535nm laser due to its
eye-safe wavelength of 1535 nm and high transmission through atmosphere. It’s also suitable for medical applications where the need for eye protection may be difficult to manage or diminish or hinder essential visual observation.
Properties:
| Cr14 | CrE5 | WM4 | EAT14 | |
| Lase properties | ||||
| Cross section for stimulated emission(10-20cm2) |
0.8 | 0.8 | 0.75 | 0.8 |
| Fluorescent lifetime(ms) | 7.7-8.0 | 7.7-8.2 | 7.7-8.2 | 7.7-8.0 |
| Center lasing wavelength (nm) | 1535 | 1535 | 1535 | 1535 |
| Optical properties | ||||
| n (1535nm) | 1.530 | 1.533 | 1.528 | 1.524 |
| nd | 1.539 | 1.541 | 1.536 | 1.532 |
| Abbe value | 64 | 63.6 | 66 | 66 |
| dn/dT(10-6/℃) (20~100℃) | -5.2 | -6.8 | -3.0 | -1.72 |
| Coeff of linear thermal expansion (10-7/℃) (20~100℃) |
103 | 80.5 | 82 | 87 |
| Thermal coeff of optical path length(10-7/℃) (20~100℃) |
3.6 | —- | 14 | 29 |