Understanding Laser Wavelengths: A Beginner's Guide

[Freakyfemto]

Homework Statement

I was presented with the following problem during my laser course:

What is the peak lasing wavelength (and FWHM value) of a Ti:Saphire laser whos florescence spectrum has a peak wavelength of 800nm and a FWHM of 100 nm?

Relevant Equations

FWHM (lasing) = ?
Lambda (lasing) = ?

I don't know even where to start. In my reasoning peak florescence wavelength should be equal to its peak lasing wavelength. Is it something to do with pulse modulator (amplifier) that is used in Ti:Sapphire lasers? Or cavity length ? (But we were not given any cavity lengths).

Any help would be appreciated.

 

[member 553083]

The peak fluorescence wavelength of a Ti:Sapphire laser is determined by its active medium, which is titanium-doped sapphire. This active medium has an absorption and emission spectrum that determines the peak fluorescence wavelength. The peak lasing wavelength of a Ti:Sapphire laser is determined by the cavity length and the gain medium, which includes the same titanium-doped sapphire active medium. The cavity length affects the resonant frequency of the laser, while the gain medium (which includes the titanium-doped sapphire) affects the amplitude of the laser emission. If the cavity length and the gain medium are matched correctly, then the peak lasing wavelength should be equal to the peak fluorescence wavelength of the titanium-doped sapphire.