Think of a cuboidal laser cavity having two mirrors whose reflectivities are equal to 0.2 and 1. The length of the active substance within the laser cavity is 10 cm. The stimulated emission cross-section is 0.3 nanometers squared. Neglecting the distribution loss within the gain medium :
(a) Calculate the threshold value of population inversion if the internal losses per one-way transit of the beam are 0.5 percent and 2 percent each.
(b) Calculate the threshold value of population inversion if the internal losses are totally negligible.
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