I'm sure you could make a simple recharger that is based on solar technology, the problem is it would either take a LONG time to recharge the batteries, or it would be so big to not be feasible with today's commercially available solar panels.
I think a normal wall charger would be fine to start out with. Use rechargeable batteries and a wall charger so you don't have to take the batteries out to recharge them. 4 hour charge or so and the lighter is fully charged and ready to go.
Perhaps a good idea would be a couple safety features.
Follow me if you will...
First, we have an open gap where the laser beam will be used to light the smoking item in question. The problem I see is that if someone drops this in their purse or pant pocket, there is the risk of some accidental pressing of the ignition button, then we have a high-power laser activated in a pocket/purse. No good can come of that.
So perhaps a guard that snaps down over the gap that must be swung away before use of the laser?
Another feature would be a child lock or some kind of lock on the button to prevent unwanted ignitions.