written 6.7 years ago by
neeta.vanage
• 860
|
modified 2.7 years ago
by
pedsangini276
• 4.8k
|
Subject :- Applied Physics 2.
Topic :- Laser.
Difficulty :- Medium.
|
written 6.6 years ago by
neeta.vanage
• 860
|
| LED | LASER Diode |
|---|---|
| Low forward bias is required | High forward bias is required |
| Light emission process is spontaneous | Light emission process is stimulated |
| Population inversion is not required | Population inversion is essential |
| Resonant cavity is not required | Resonant cavity is essential. Opposite sides of pn junction are made parallel and reflecting to cause feedback |
| Emitted radiation is incoherent and of low intensity | Emitted radiation is highly coherent, high intensity and monochromatic. |
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