What does Mode Hop Free (MHF) tuning mean?
Mode hops are caused by internal longitudinal modes competing for available gain within the laser cavity. As the laser tunes across the quantum cascade gain profile, different laser modes become dominant and causes the optical output to “hop” from one mode to another. This “hopping” of the lasers wavelength causes the optical output power to miss certain wavelength bands between the modes. This can cause a spectrometer to miss certain features of an absorption profile. Daylight Solutions’ patented Mode Hop Free (MHF) lasers tune a narrow linewidth continuously across the entire gain band in a way that eliminates mode hopping.
