When a signal of intensity 30kwm-2 is applied at the input, Ask an Expert

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When a signal of intensity 3.0kWm-2 is applied at the input of an amplifier of length 10m, the output signal intensity is 36kWm-2

When the input intensity is reduced to 1.0kWm-2 the output is 20kWm-2

a) Calculate the value of the saturation intensity and the small signal gain coefficient??

Another laser amplifier gives an output of 5I₀ when it receives input intensity I₀tuned to w₀, the centre frequency of the laser transition. When the input radiation istuned to nearby angular frequency w₁, an input intensity of 3 I₀ is amplified to an output intensity of 7 I₀.

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

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