Yes, and you can plan your trip with 9292.nl.
During the morning and evening rush hour you can travel three times an hour in approximately 25 minutes from Leiden Central to Unmanned Valley (and back). Line 35 runs between bus stop Duinvallei/N206 and the former naval airbase/bus stop Field Lab Unmanned Valley. During peak hours buses to and from Leiden (bus lines 30, 31, 38 and 221) call at the Duinvallei/N206 stop 15 times an hour.
Outside rush hour you travel once in approximately 45 minutes (including 10 minutes walk) from Leiden Central to Unmanned Valley (get off at the stop 1e Mientlaan, Katwijk).