12.07.2015 Views

Bab-1. Laser

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Bagaimana probabilitas absorpsi dan emisi ?Assumsikan Ni adalah jumlah molekul/atom persatuan volume yang mendudukitingkat energi ke-i pada waktu t (populasi level-i)2N 2, E 21N 1, E 1<strong>1.</strong> Kasus AbsorpsiLaju transisi 1 → 2⎛⎜⎝dNdt⎞1⎟ = −W12N1⎠aW 12= laju absorpsi= σ 12Fσ 12= penampang absorpsiF = fluks foton (cm -2 det -1 )

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