There are HF lasers
They are molecular lasers- they use vibrational transitions in the HF molecule to get lasing at a frequency of about 2.8 microns.
The reason for the DF lasers is the mass difference betwee H and D. This mass difference leads to a change in the vibrational frequency of the molecule, so DF lasers lase around 3.5 micron- This wavelength travels through air better than the HF frequency, so it preferred for military applications.