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How 'random' lasers work
Date:1/24/2010

om materials that are literally shaken together. These are called random lasers since the emission happens from an uncontrolled configuration" a disordered rather than crystal structure within the "lasing medium" the material used to generate the laser.

"There has been some disagreement how random lasers operate. For an analogy, imagine you are outside a sports stadium and hear the roar of the crowd. Is the noise initiated throughout the stadium at the same time (led by cheerleaders shouting 'Go! go!'), or are people yelling on their own ('Great catch,' 'Yea!')?"

"Our work has shown that the emission from random lasers happens with one emitter at a time, like individuals in the crowd yelling unconnected shouts," Polson says.

Vardeny and Polson conducted the study with first author Abdullah Tulek, who now works in Turkey but was a University of Utah doctoral student at the time. The study was funded by the U.S. Department of Energy and the National Science Foundation.

How Lasers Work

Laser stands for Light Amplification by Stimulated Emission of Radiation. Unlike a bulb, which emits many wavelengths of light in all directions, conventional laser light has one wavelength and moves as a beam in one direction with light waves in lockstep.

Vardeny explains how a laser beam is emitted. First, "you excite a molecule or a chromophore" a dye or other substance that emits light using electricity or another source of light. The excited molecule emits a photon or light particle. The photons travel and stimulate other chromophore molecules to emit additional light.

When a bunch of photons hit chromophores with the right energy to be in resonance with the light the chromophores will emit, the chromophores emit light at the same instant they are hit by the photons. The combined emission is stimulated emission of radiation the "ser" in laser.

As lasers were developed in the 1960s, resear
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Contact: Lee Siegel
leesiegel@ucomm.utah.edu
801-581-8993
University of Utah
Source:Eurekalert  

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