Cesar,
Yes, you'll definitely want to do this with a counter programmed for retriggerable single pulse generation. In that mode, every trigger edge causes the counter to produce a single pulse. Note however that additional triggers which arrive before the pulse completes will be ignored.
Here's a link to an example [link removed; example no longer available]. There's also a little further help here [link removed; article no longer available] regarding some specific details in the timing.
Most multifunction boards have 2 counters available that are able to handle your timing precision without using the CPU. The timing variability for the delay and pulse time should be about 0.05 microseconds or less, and you can have a delay as small as about 0.1 microseconds.
-Kevin P.
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