2. Calculate the threshold of population inversion ( AN) for ruby laser (2 694.3nm) If the mirrors' reflectivities are RI-R2-0.9 and the life time for spontaneous emission is (r = 3x10s), length of the laser medium is 5 cm and its refractive index is (1.7). Assume the line shape function (g(v) =1.1x10 s) and neglect the coefficient of internal losses. From the result calculate the threshold gain ( Y) if the transition cross section is o = 2.8x10"cm
2. Calculate the threshold of population inversion ( AN) for ruby laser (2 694.3nm) If the mirrors' reflectivities are RI-R2-0.9 and the life time for spontaneous emission is (r = 3x10s), length of the laser medium is 5 cm and its refractive index is (1.7). Assume the line shape function (g(v) =1.1x10 s) and neglect the coefficient of internal losses. From the result calculate the threshold gain ( Y) if the transition cross section is o = 2.8x10"cm
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Transcribed Image Text:2. Calculate the threshold of population inversion ( AN) for ruby laser (2= 694.3nm) If the mirrors
reflectivities are RI=R2-0.9 and the life time for spontaneous emission is (r = 3x10s), length of
the laser medium is 5 em and its refractive index is (1.7). Assume the line shape function
(g(v) =1.1x10 s) and neglect the coefficient of internal losses.
From the result calculate the threshold gain (Yh) if the transition cross section is o= 2.8x10"cm
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