Lasers & Stimulated Emission

LASER SIMULATION

▸ Loading the gain medium (ruby / He-Ne / diode)…

▸ Switching on the energy pump (optical/electrical)

▸ Calibrating atomic energy levels (E₁ ↔ E₂)

▸ Building the optical cavity — 100% & partially reflective mirror

▸ Testing stimulated emission (cloning identical photons)…

▸ Ready — Online. ✅

Laser cavity state

🔴 Stimulated emission

Pump power—

Inversion ΔN—

Mirror reflectivity—

Photons in cavity—

Gain factor—

Emission state—

Notes

LASER = Light Amplification by Stimulated Emission of Radiation. It needs population inversion (more atoms in the excited state than in the ground state) via energy pumping. A passing photon stimulates an atom to emit one more identical photon (same phase · direction · wavelength). A two-mirror optical cavity reflects light back and forth to amplify it → a coherent, monochromatic, collimated beam.

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Turn-on: photons surge past threshold (relaxation oscillations) pumpphoton count