Stimulating Emission: the Principles of the Maser and Laser

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Stimulating Emission: The Principles of the Maser and Laser Matt Henderson Maser-Laser ● Microwave or Light Amplification through the Stimulated Emission of Radiation ● First functioning laser completed in 1960 ● Innumerable uses in modern society The Beginning: Einstein's Thermodynamics ● In 1917, Einstein investigated the black body law dI/dt = ANb - BINa + B'INb ● A-Spontaneous Emission ● B-Spontaneous Absorption ● B'-Stimulated Emission Spontaneous Emission/Absorption ● Spontaneous Emission: random emission of a photon due to upper to lower energy level transition ● Spontaneous Absorption: absorption of a photon causing a transition from lower to upper energy levels Stimulated Emission ● When an electron is 'stimulated' by a passing photon to decay into a lower energy level The Beginning: Einstein's Thermodynamics ● Boltzmann's Law Nb=Na*e^(-W/kT) ● Nb must be less than Na at any Temperature The Beginning: Einstein's Thermodynamics ● However, if Nb>Na dI/dt = ANb - BINa + B'INb ● Then dI/dt will be positive, and the radiation will be amplified The Theory: Population Inversion ● For the radiation to be amplified, Nb > Na ● Most common method for lasers is with the use of four energy levels The First Maser ● Created by Charles H. Townes in 1953 ● Ammonia is the gain medium The Maser: Applications ● Currently, the maser serves as the best atomic clock ● Maser detection has astrophysical uses The First Laser ● Theodore Maiman operated first functioning laser in 1960 ● Chromium-doped ruby was the gain medium The Laser: Rapid Advances ● "Optical Maser" first theorized in 1958 ● First functional laser (solid-state) in 1960 ● First gas laser (He-Ne) later in 1960 ● First laser diode in 1962 ● First semiconductor laser later in 1962 The Laser: Modern Applications ● "Solution looking for a problem" ● Thousands of problems since the 1960s solved ● Used in nearly every aspect of society; Medicine, Industry, Consumer Electronics, Entertainment, Law Enforcement The Laser: Future Applications ● Igniting nuclear fusion ● Biological lasers ● Current most powerful laser: 1.3 PW (1.3 x 10^15 W) Conclusion ● Since the first laser was built, rapid advancements ● Allowed investigation of many different branches of physics ● One of the most important inventions of the 20th century.

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