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Bab-1. Laser

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3. Kasus Emisi TerstimulasiLaju transisi 2 → 1 W 21= laju emisi terstimulasi (det -1 )⎛⎜⎝dNdt⎞2⎟ = −W21N2⎠st= σ 21Fσ 21= penampang emisi terstimulasiProses emisi terstimulasi dicirikan oleh emisi terstimulasi dan absorpsi.Menurut Einstein:g22W2121gg11Wg 1= jumlah degenerasi di tingkatan energi -1g 2= jumlah degenerasi di tingkatan energi -2gσ==σ1212

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