{TAIL ~ The low frequency and d.c. components} of the photo detector output are proportional to {HEAD ~ the average light intensity incident} thereon, and an error signal derived from the comparison thereof with a reference voltage is compensated, amplified, and limited, and applied to a regulator to control the discharge current of a laser light source 
{ TAIL ~ The low frequency and d.c . components } of the photo detector output are proportional to { HEAD ~ the average light intensity incident } thereon , and an error signal derived from the comparison thereof with a reference voltage is compensated , amplified , and limited , and applied to a regulator to control the discharge current of a laser light source
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH