Question

An Nd-doped YAG laser emits 100 mW at 1064 nm and has an optical gain bandwidth of 80 GHz. The laser medium has a spontaneous decay rate of 200 µs and loss coefficient ???? of 0.2 cm-1 . If the laser is 8 cm long and 1 cm in diameter, and one of its mirrors can be considered perfect, while the other is 95% reflective, find the threshold population inversion density of the Nd ions, the photon cavity lifetime and the photon density in the cavity

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