What does laser light amplification rely on?

What is stimulated emission?

What does population inversion mean?

A laser transition has energy gap \(2.00\,\mathrm{eV}\). Find the photon frequency.

A laser has wavelength \(633\,\mathrm{nm}\). Find the photon energy in electronvolts using \(hc=1240\,\mathrm{eV\,nm}\).

Name two properties that make laser light different from ordinary lamp light.

Why is a population inversion necessary for laser gain?

What is the role of an optical cavity in a laser?

A cavity of length \(0.300\,\mathrm m\) supports standing waves with \(2L=m\lambda\). If \(\lambda=600\,\mathrm{nm}\), find \(m\).

A transition energy is \(1.55\,\mathrm{eV}\). Find the laser wavelength.

Why does stimulated emission produce coherent light?

Why is pumping required in a laser?

A laser output power is \(2.00\,\mathrm{mW}\) at \(500\,\mathrm{nm}\). Estimate photons emitted per second.

Why is a true two-level laser difficult to operate continuously?

How does a metastable state help laser action?

Derive the laser wavelength from the upper and lower laser-level energies.

Explain why laser amplification does not violate energy conservation.

A cavity supports modes satisfying \(2L=m\lambda\). Derive the spacing between adjacent mode frequencies.

Why does a laser beam have small divergence compared with an ordinary source?

Connect stimulated emission, inversion, and cavity feedback in one laser threshold explanation.