i completed:
Light emitting diodes vs. Laser diodes:
LEDs are based on spontaneous emission, and have
1. A broad output beam that is hard to capture and focus
2. A relatively broad spectral profile
3. Low to moderate overall efficiency
4. Moderate to high speed (≈ 1/tmin)
Laser Diodes are based on stimulated emission, and have the opposite characteristics
1. Narrow, highly directed output
2. Sharp, narrow emission spectrum
3. High differential and overall efficiency
4. High to very high speed
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Absorption Rate:
Spontaneous Rate:
stimulated Rate:
for more info in about processes see this link
6.772/SMA5111 - Compound Semiconductors
Lecture 20 - Laser Diodes 1 -Outline
https://ocw.mit.edu/courses/electri...vices-spring-2003/lecture-notes/lecture20.pdf
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