Awesome.
Heavy Magna Cannon should have double the charge recovery rate - so that its sustained DPS is equal to the medium Magna Cannon. Otherwise, it's fine as is.
Incinerator Beam should cost more like 26 ordnance points, rather than 16; it's kindof a niche weapon - but in that niche it's completely unsurpassed. (Yes, it also obliterates pirate ships... but there are plenty of other weapons that will do that too, just slightly less expeditiously; a Drake destroyer with a Heavy Laser Beam is slightly slower at slaying pirates, but no less capable.)
Microlaser: My suggestion is, after some testing: 50% increase in damage, 100% increase in charge recovery rate, reduce charges to 2. That gives a microlaser a burst DPS of 75 - meaning it matches a beamer (until it runs out of charges), with a sustained DPS of 30 (meaning after about 1.5 seconds it's moderately pathetic - but not totally useless.)
Microlaser Array: I'd suggest 50% increase in damage, 150% increase in charge recovery rate. This makes it actually competitive with other medium point defense weapons - it's better at shooting down single digit salvos of missiles than most of them, but significantly inferior for any secondary purpose - the linked beamer is better at support & anti-fighter (due to range & better sustained dps), and the various projectile (alien dual laser, chainblaster, laser cannon, etc) all feature superior range and the ability to deal hard flux.
Microlaser,microlaser,1,1200,500,150,,,0,75,4,2,1,ENERGY,,150,,0,0.2,0.2,,,,,1000000,,,,,PD,268877
Scorcher Beam,scorcher,1,3500,450,500,,,0,16,8,,,HIGH_EXPLOSIVE,,500,1,1,,,,,,,500,,,,,"USE_VS_FRIGATES,STRIKE",773524
Incinerator Beam,incinerator,1,6000,800,500,,,0,8,26,,,HIGH_EXPLOSIVE,,500,1,1,,,,,,,750,,,,,"USE_VS_FRIGATES,STRIKE",7773524
Linked Beamer,hvybeamer,1,1800,800,180,,,,24,10,,,ENERGY,,150,0.5,1,,,,,,,10000,,,,,PD,10140998
Microlaser Array,focuslaser,1,3500,550,450,,,0,60,12,5,1.5,ENERGY,,450,,0,0.2,0.2,,,,,1000000,,,,,PD,2688877
Magna Cannon,magna,1,3500,800,,400,,0,10,12,,,HIGH_EXPLOSIVE,200,,0,2,1,,0,0,0,0,,450,,,,"USE_VS_FRIGATES,STRIKE",104770
Heavy Magna Cannon,hvymagna,2,9000,800,,400,,0,12,20,5,0.5,HIGH_EXPLOSIVE,200,,0,0.25,1,,0,0,0,0,,450,,,,"USE_VS_FRIGATES,STRIKE",10477055
I'd also suggest either greatly increasing the turn rate of the alien beam, or making it not a point defense weapon; right now, it's all but useless at actually hitting missiles, but still tries to target them over actual ships - resulting in it being largely ineffective against anything that uses missiles.