If the raspberry extract is the only flavor, i.e., you're not using raspberry puree or whole raspberries, etc., you really don't need to secondary the beer. Most common practice is to add flavor extracts at bottling, perhaps because it's easier to stir the extract into the beer and take samples to taste in your bottling bucket than a carboy. Also, adding the extract closer to bottling time ensures that none of the aroma will be lost.
"Chill haze is not a flaw. But if you really hate it, try Clarity Ferm. It works!"
Warrior's Ale II (w/exp 6300 hops)
Quadro (quadrotriticale ale)
Black Bat'Leth Stout
Targ's Blood Nut Brown Ale
Battle Cruiser Blonde Ale
Supersecret sour beer experiment v0.5
Supersecret sour beer experiment v1.0
Supersecret sour beer experiment v1.5