The low frequency and d.c. components of the photo detector output are proportional to {TAIL ~ the average light intensity incident} thereon, and {HEAD ~ 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 
The low frequency and d.c . components of the photo detector output are proportional to { TAIL ~ the average light intensity incident } thereon , and { HEAD ~ 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
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH 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