A cylindrical rod of some laser material \[5\times {{10}^{-2}}m\] long and \[{{10}^{-2}}\] m in diameter contains \[2\times {{10}^{25}}\] ions \[6.6\times {{10}^{-7}}m.\] per m3. 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 \[6.6\times {{10}^{-7}}m.\] If the pulse lasts for\[{{10}^{-7}}s\]. the average power of the laser during the pulse is

A cylindrical rod of some laser material \[5\times {{10}^{-2}}m\] lo

1.	A cylindrical rod of some laser material \[5\times {{10}^{-2}}m\] long and \[{{10}^{-2}}\] m in diameter contains \[2\times {{10}^{25}}\] ions \[6.6\times {{10}^{-7}}m.\] per m3. 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 \[6.6\times {{10}^{-7}}m.\] If the pulse lasts for\[{{10}^{-7}}s\]. the average power of the laser during the pulse is
A.	532 MW
B.	352 MW
C.	235MW
D.	325 MW
Answer» D. 325 MW