Laser types

300px|thumb|upright=1.7 |The first prototype ammonia maser in front of its inventor [[Charles H. Townes. The ammonia nozzle is at left in the box, the four brass rods at center are the quadrupole state selector, and the resonant cavity is at right. The 24 GHz microwaves exit through the vertical waveguide Townes is adjusting. At bottom are the vacuum pumps.]] thumb|right|260px|A hydrogen radio frequency discharge, the first element inside a #Hydrogen maser|hydrogen maser (see description below)

equipment using an organic dye to emit coherent light

laser that emits electromagnetic radiation

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propagating atomic wave

any laser not classified as continuous wave

type of laser

A spaser or plasmonic laser is a type of laser which aims to confine light at a subwavelength scale far below Rayleigh's diffraction limit of light, by storing some of the light energy in electron oscillations called surface plasmon polaritons. The phenomenon was first described by David J. Bergman and Mark Stockman in 2003. The word spaser is an acronym for "surface plasmon amplification by stimulated emission of radiation". The first such devices were announced in 2009 by three groups: a 44-nanometer-diameter nanoparticle with a gold core surrounded by a dyed silica gain medium created by re

type of laser

laser whose wavelength can be altered