The active medium in a particular laser that generates laser light at a wavelength of 694 nm is 6.00 cm long and 1.00 cm in diameter. (a) Treat the medium as an optical resonance cavity analogous to a closed organ pipe. How many standingwave nodes are there along the laser axis? (b) By what amount `Deltaf` would the beam frequency have to shift to increase of the travel by one? (c ) Show that `Deltaf` is just the inverse of the travel time of laser light for one round trip back and forth along the laser axis. (d) What is the corresponding fractional frequency shift `Deltaf//f`? The appropriate index of refraction of the lasing medium (a ruby crystal) is 1.75.

Explanation

(a) `3.03xx10^(5)`, (b) `1.43xx10^(9)Hz`, (d) `3.31xx10^(-6)`