How far apart should I get Fraxel and Excel V laser resurfacing treatments?

Fraxel is a type of laser resurfacing that influences collagen production.  Excel V is a vascular laser reducing redness.    While these 2 treatments can actually be performed on the same date, there is some possible increased redness and swelling, hence, modest increased downtime.   When alternating these treatments there is less social downtime so treatment timing can be customized per patient.

This is correct.  The two lasers have different skin targets, different depth of penetration.  Two weeks in between should allow enough healing to alternate lasers.  

It is not necessary to space them apart. I routinely do them simultaneously. There might be a bit more swelling but the skin can tolerate both lasers. In fact, I sometimes add a QS laser for the darker pigmented areas as well. Using a LLLT such as Healite afterwards will bring the recovery time down. Sleep upright as well.