Determine gain-cross sections at the two frequencies


Another laser amplifier gives an output of 5I0 when it receives input intensity I0 tuned to ?0, the centre frequency of the laser transition. When the input radiation istuned to nearby angular frequency ?1, an input intensity of 3I0 is amplified to an output intensity of 7I0.

What is the ratio of the gain-cross sections at the two frequencies?

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Physics: Determine gain-cross sections at the two frequencies
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