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1) Determine the wavelength for which the spontaneous emission for equal to that of stimulated emission...

1) Determine the wavelength for which the spontaneous emission for equal to that of stimulated emission at room temperature with Thermal equilibrium condition .

2) calculate the Quality factor Q for a He-Ne laser that contain front mirror with 95% Reflexivity and the length of optical resonator is 1 m , them calculate the Emission line of the wavelength λ is 632.8 nm and the mirror Reflexivity is 99% , then calculate the Longitudinal patterns for the optical resonator.

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