Mirrorless Laser: A New Light Source
A team of physicists from the University of Innsbruck and Harvard University has proposed a new way to generate laser light: a laser without mirrors.
Their study shows that quantum emitters spaced at subwavelength distances can synchronize their photon emission to produce a bright, narrow-band light beam, even without an optical cavity.
In conventional lasers, mirrors bounce light back and forth, stimulating coherent emission from excited atoms or molecules, and thus light amplification.
In contrast, the new "mirrorless" concept relies on direct interaction between atoms through their electromagnetic dipole fields, given that interatomic spacing is smaller than the emitted light's wavelength.
The atoms interact directly through their own electromagnetic dipole fields.
Author's summary: Physicists propose a new mirrorless laser concept.
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