The laser idea reminded me of some idle thinking that took place is Finland - perhaps the most mosquito infested place I've ever visited! Large areas of marsh and 8 million reindeer to nourish the little blighters...
Rant over time for the idea:
Essentially omnidirectional mosquito killing
doom in the form of a Tesla coil. Either placed where they are likely to be and simply turned on periodically or triggered by the buzz, or perhaps, a bit of both.
Lasers were considered, but I like my eyes. Partly because of the difficulty involved in growing new ones. A window covering high voltage mesh was also considered. Being both reasonably safe and perhaps effective and achievable, the idea was snuffled to allow the continued look for a more spectacular and violent solution. A window is only 2D. Tesla coils have nice long jagged sparks that are very 3D.
In order to more fully expand the idea beyond simply having a Tesla coil, some other useful aspects should also be mentioned. Mosquito's are mostly found on holiday, leading naturally to a compact unit, supplied in a case with a selection of power adapters. Obviously it's a good idea not to get zapped yourself, so a PIR detector shuts down the unit if it detects anything sizeable moving. An inferred remote control is also included to allow a safe distance between the user and the device of doom.
It is assumed that any mosquito foolish enough to fly near the electrode would provide a slightly better electrical path then air and so unwittingly end up being part of an arc. Thus targeting is not required. Doom is self-induced.
It should be advised that such a machine should only be operated in a ventilated space to avoid ozone build up. It should not be used near electrical equipment, pets, family heirlooms, or on top of mountains in thunderstorms.
A deluxe version doubles as a bed side lamp and includes a small fan and carbon filter to deal with burnt smells and ozone. While the safari equipment version includes rechargeable batteries, a low power lamp to attract moths (sometimes they need killing too) and a 12V lead to charge it off the land rover.