Explore BrainMass
Share

This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

(a) The He-Ne laser operates on several s --->p transitions in neon, including the 5s --->3P transition at 632.8 nm. Under the operating conditions of the laser, the fluorescence lifetimes of the upper and lower levels are approximately 100 ns and 10 ns respectively for this transition, and the Einstein-A coefficient is 10^7 s^-1. Taking the upper and lower laser levels to have equal degeneracies, determine whether or not it is possible, in principle, for continuous-wave laser oscillation to be observed on this transition.

(b) Repeat the calculation for the 3d^10 delta p 2^P_3/2 ---> 3d^9(delta)s^2 2^D_5/2 transition at 510 nm in the copper-vapour laser, given that the Einstein A coefficient is 2 x 10^6 s^-1 and the fluorescence lifetime of the lower laser level is approximately 10 us.

Solution Summary

Steady-state laser oscillation for a He-Ne laser is examined. The solution determines is continuous wave laser oscillation is observed on the transition.

\$2.19