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Electromagnetically Induced Transparency (Experimental)

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ECDLs are complete laser systems and<br />

that is what adds up to their cost.<br />

The diffraction grating is outside of the<br />

lasing medium and at some distance<br />

from it.<br />

The wavelength is adjusted by varying<br />

the distance of the grating from the<br />

cavity using piezo-electric effect.<br />

So no loss of power during wavelength<br />

variation.

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