Create short (ns) pulses with a timer/counter

Dear all,

I am currently looking into purchasing equipment for a new test setup.

I will need to create 5 ns long pulses as a sync signal for a laser. The repetition rate will be ~20kHz.

Can I create a 5 ns long pulse with a timer/counter like the PXIe-6614? Or should I use something else.

I need a very reproducable start time of the pulse, this is why I am thinking of a timer/counter.

Any advise in this is much appreciated.