Recent research has revealed an exciting new technique for boosting second harmonic generation in materials. By stacking two layers of strain on top of each other, scientists were able to dramatically enhance second harmonic generation in a sample of lithium niobate. This finding could be used to develop new kinds of optical devices for data transmission, signal processing, and sensing. By applying two layers of strain, scientists were able to produce an effect that was more than twice as strong as what could be achieved with just one layer. This opens up the possibility of using this technique to create even more powerful optical devices.

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source: Phys.org