The nitrogen-laser-pumped dye laser produces pulses of 2-8 nanoseconds in duration at repetition rates currently up to 500 pulses per second. With such a low duty cycle system, box-car analyzers are often used to amplify the signal from the photodetector. Except for some of the newer, ultra high-speed models, the box-car does not yield information as to pulse shape The technique to be described utilizes the more commonly available, and less expensive lock-in amplifier to measure light pulses. It will be shown that the signal derived with the lock-in is proportional to the total energy per pulse of the incident light. The technology employed to record oscillograms of these short duration pulses using regular side-on and end-on photomultiplier tubes is also discussed.
Elliot F. Wyner,
John A. Sousa,
Joseph F. Roach,
"Application of a Lock-in Amplifier for Detecting Nanosecond Dye Laser Pulses," Optical Engineering 13(2), 132154 (1 April 1974). https://doi.org/10.1117/12.7971690