Voluma is placed in the deep fat and much lower than the depth that an ablative laser will penetrate so you should be safe. My only advice is to consider Renuvion which is much more effective than CO2 or Erbium. A skype or facetime consultation with a Vaser specialist would be helpful.
Controversial - some do immediately, I separate one week apart due to swelling of filler and reports of increased infection (not studies - just case reports) of filler and laser. No right answer, depends on the skill level of the Specialist. If you are in CA, Dr Emer is skilled in this procedure. All the best, Dr Davin Lim. Australia.