What is the Q value for a krypton laser with given specifications?

[PH^S!C5]

Homework Statement

Calculate the Q value for a krypton laser with λ=0.569 microns, 0.568m cavity and mirror reflectance of 100% for the rear and 52% for the output window.

Homework Equations

For a laser cavity=> Q=(4πL)/(λ(1-R1*R2))

The Attempt at a Solution

Q= (4*π* 0.568m)/((0.569x10^-6)(1-(1)(0.52)) = 2.61x10^7 m

I am not sure if this is correct, can the Q factor be this high? Thanks for your help!

 

[TSny]

Looks good to me. This article gives some values of Q factors for various systems including laser cavities. http://en.wikipedia.org/wiki/Q_factor

 

[TSny]

Just to nit-pick. Q has no units. The units for L and λ cancel.

 

[PH^S!C5]

Hi Tsny,
I was also wondering about the units, thanks for your help!