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A cylindrical rod of some laser material 5 x 10-2m long and 10-2m in diameter...

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A cylindrical rod of some laser material 5 x 10-2m long and 10-2m in diameter contains 2 1025 ion per m. If on excitation all the ions are in the upper energy level and de-excite simultaneously emitting photons in the same direction, calculate the maximum energy contained in a pulse of radiation of wavelength 6.6 x 10-7m . If the pulse lasts for 10-7 s, calculate the average power of the laser during the pulse A. 33.55 WB. 43.55 WC. 23.55 WD. 29.55 W

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