Many papers about random lasers mention the Q-factor of random lasers. Since a random laser has multiple peaks close to each other like shown in the figure. Does each of these peaks correspond to a unique random lasing mode, or is it just a single mode?

Randmom peaks during random lasing

Similarly what is the right way to calculate the Q-factor of this random laser (example plot shown below) : Should it be wavelength at Peak1 divided by FWHM at (blue line) or wavelength of Peak1 divided by FWHM at (red line) ?

Q-factor calculation in a random laser

Should the Q-factor be calculated at -3db or FWHM?


I haven’t looked to see what the random laser practitioners do, but if it were me, I would fit the combined peak as the sum of two individual peaks and get the line widths from the fitting parameters. Then you just report what you did.

| cite | improve this answer | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.