Breakthrough in Laser Light Generation
Researchers from Innsbruck and Harvard have developed a new method to generate laser light without the use of mirrors.
This innovation yields highly stable optical references for quantum sensors, clocks, and on-chip devices, and is made possible by passive emitters that significantly enhance light emission.
The achievement, described in Physical Review Letters, was supported by the Austrian Science Fund (FWF) and the European Union, among others.
Conventional vs. Mirrorless Lasers
In traditional lasers, mirrors play a crucial role in bouncing light back and forth, stimulating coherent emission from excited atoms or molecules, resulting in light amplification.
But in the new “mirrorless” concept, the atoms interact directly through their own electromagnetic dipole fields given that interatomic spacing is smaller than the emitted light’s wavelength.
When the system is pumped with enough energy, these interactions cause the emitters to lock together and radiate collectively, a phenomenon known as superradiant emission.
Author's summary: Innsbruck and Harvard researchers develop mirrorless laser technology.
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