ACR MLG WAKE TURB ENCOUNTER IN ICB OFF RWY 17R AT DFW.

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AFTER TAKING OFF OF RWY 17R AT DFW AND PASSING 1200 FT MSL OUR MLG ENCOUNTERED SEVERE WAKE TURB CREATED BY A PREVIOUSLY DEPARTING LGT. THE PF WAS STRUGGLING TO RETAIN ACFT CTL; USING FULL FLT CTL INPUTS TO COUNTERACT THE ROLL RATE. THE WAKE TURB HAD CHANGED THE ACFT'S HDG TO APPROX 155 DEG FROM THE ASSIGNED 170 DEG RWY HDG. AS THE PNF I TOLD DEP CTL THAT WE WERE ENCOUNTERING SEVERE WAKE TURB AND TURNING L NOW TO GET OUT OF IT. DEP CTL RESPONDED 'NEGATIVE ON THE TURN.' I REINFORMED DEP THAT WE HAD NO CHOICE TO WHICH THEY INSTRUCTED THAT OUR TURN MUST BE LIMITED TO NO MORE THAN 10 DEG. STILL IN THE WAKE WE ADVANCED PWR TO MAX AND TOOK AN APPROX 140 DEG HDG AND ESCAPED THE TURB. WE WERE VISUALLY CLR OF ALL OBSTRUCTIONS AND TFC. IT SEEMS AS THOUGH THE TWR CTLR ISSUED TKOF CLRNC WITH LESS THAN NORMAL TIME SEPARATION. ADDITIONALLY; THE DEP CTLR; DESPITE OUR ADVISORY; GAVE INSTRUCTIONS THAT WOULD HAVE FURTHER ENDANGERED OUR FLT BY RESTRICTING OUR TURN. IT MAY BE THAT 1 OR BOTH OF THESE CTLRS WERE UNAWARE OF THE EFFECTS OF WAKE TURB OR FEEL THAT IT'S MORE IMPORTANT TO KEEP ACFT FROM OVERFLYING NOISE SENSITIVE AREAS THAN IT IS TO HAVE THEM OPERATE SAFELY. OUR CREW COULD HAVE ASKED FOR INCREASED SEPARATION FOR TKOF.