At the output, we have smaller energy (and longer wavelength). The lasing wavelength of ytterbium is 1030 nm, which corresponds to the frequency and energy of
νo=λoc, Eo=hνo=hλoc.The optical pumping (conditional input) occurs, of course, at higher energy (which is proportional to the frequency), or shorter wavelength of 940 nm:
νi=λic, Ei=hνi=hλic.In laser, the time required to pump and the time required to give that energy out is equal:
t=PiEi=PoEo, hPiλic=hPoλoc, Piλi=Poλo, Po=Piλλio=11030940=0.9126 W.
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