Physics Unit-4: Laser Basics

What is the acronym for laser stands for?

Who developed the first laser device?

What is the wavelength of light emitted by the Ruby Laser?

What is the wavelength of light emitted by the Helium-Neon laser?

In which year was the theoretical basis for the development of laser provided?

What was the historical precursor to the laser?

What is the probability of spontaneous emission given by?

What is the coefficient of stimulated emission?

What is the Boltzmann distribution law?

How does the frequency of radiation affect the value of B21?

What is the total probability of emission of a photon given by?

What happens to the population of the higher energy state when temperature increases?

What is the minimum number of energy states required to achieve population inversion?

What is the characteristic of a metastable state?

What happens when the population of the higher energy state exceeds that of the lower energy state?

What is the purpose of a metastable state in a laser?

What is the condition for achieving optical gain?

What is the condition required for population inversion to be achieved?

What is the function of the optical resonator?

What type of lasers can be formed depending on the active medium?

What happens to the spontaneous emission from E3 to a metastable state?

What is the purpose of the energy source?

What is the function of one of the mirrors in the optical resonator?

What is the duration of the flash lamp's bright flash of light?

Why is the rod's length made precisely an integral number of half wavelengths long?

What is the effect of the flash lamp stopping its operation?

What is the phenomenon characterized by high-intensity emissions having random amplitude fluctuations of varying duration?

What is the purpose of the two reflecting ends of the ruby rod?

What is the duration of the metastable state according to the level at 2.25 eV?