(a) State and explain spontaneous emission and stimulated emission. D…
Previous year question for Advanced Engineering Physics.
Question
(a) State and explain spontaneous emission and stimulated emission. Discuss Einstein's co-efficient and derive relation between them. (12)
(b) A ruby laser emits 0.1 J pulses of light of wavelength 720 nm. How many minimum numbers of $\text{Cr}^{3+}$ ion is there in ruby? (8)
- Year: 2022
- Subject: Advanced Engineering Physics