Fire Dome

The famous phrase of the recent days "Iron Dome" and my research on Tritium made me think of a fictional design, "Fire Dome".

Comparably high concentration of hydrogen isotope at a relatively low altitude can be used to light fire at certain altitudes, mainly around 20km. Higher concentration of ozone at those altitudes is also a nice coincidence. I thought if high altitude airship I had proposed could be modified to beam sound waves to concentrate and compress the air at specific location and then lit up by laser remotely to produce an explosion that could damage an enemy missile at close proximity. Most probably the hydrogen concentration would be so low to create such an explosion. Even if this idea worked, it would have one major drawback. It would only work on daytime. Considering the nightly missile attacks it would have limited benefit.