(a) Explain the construction, working principle, and energy level dia…
Previous year question for Advanced Engineering Physics.
Question
(a) Explain the construction, working principle, and energy level diagram of a He-Ne laser. Discuss the role of helium and neon atoms in achieving population inversion. Also describe its output characteristics and important applications.
(b) A ruby laser emits a $0.05\text{ J}$ pulse of wavelength $694\text{ nm}$. Calculate the minimum number of $\text{Cr}^{3+}$ ions required in the ruby laser.
- Year: 2022
- Subject: Advanced Engineering Physics