Lasers
Subject:
Physics [1]
Tags:
Physics Lasers [2]
Lasers Light Amplification by Stimulated Emission of Radiation The laser gets energy from electrons, which are transformed, into light. How does an electron accept energy? Illuminate the atom with light radiation of suitable color (frequency) Stimulated absorption The energy of the photon E2 ? E1 = hf What happens after absorption? Spontaneous emission Fluorescence Stimulated emission Increased energy Basic principle of laser Small input, large output Why is a laser very powerful? A laser can produce a narrow beam of coherent light of identical frequency, phase, and colorization Laser light is generally a monochromatic light; yet, there are lasers that emit different wavelengths of light simultaneously Random Source Waves emitted from the source have random phase Ex. Flash light