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