https://www.analog.com/en/resources/technical-articles/max3740-the-max3740max3795-laser-driver-average-power-monitors-pwrmon.html
MAX3740: The MAX3740/MAX3795 Laser Driver Average Power Monitors (PWRMON) | Analog Devices
The MAX3740 and MAX3795 laser drivers provide monitor output of the average optical power of laser diode using monitor diode current from the laser assembly....
laser driverpower monitors