Optical
Optical
Section titled “Optical”| Laser | LED | |
|---|---|---|
| Radiative medium, specificity? | Identical medium with radiative transitions | Identical medium with radiative transitions |
| Cavity | Yes | No |
| Coherence length | from cm to km | < cm |
| Linewidth | from nm to pm | a few 10nm |
| Preferred type of emission | Stimulated | Spontaneous |
| Threshold presence | Yes | No |
| Quantum efficiency | 2*10^-2 | 2*10^-3 |
- http://www.sosryko.fr/ - Optics material