{HEAD ~ means} for regulating comprises a transistor circuit for controlling the discharge current from {TAIL ~ the source} of laser light 
{ HEAD ~ means } for regulating comprises a transistor circuit for controlling the discharge current from { TAIL ~ the source } of laser light
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH