Initially, I had two lasers, both with the same frequency and the stable trace was obtained in an oscilloscope using the ramp of one of the laser as a triggering source. Now, I added another laser having a different wavelength and now I am unable to achieve a stable trace in the Oscilloscope. I also tried to use the ramp of my third laser for triggering but in that case, the actions of the previous two lasers get disturbed.
To be more precise, previously I was using two lasers to obtain an EIT peak using the pump-probe technique by detecting the probe laser and in that case, I triggered my signal in the oscilloscope using the ramp of the probe laser. Now I added one more laser of a different wavelength i.e. now I have two pumps and a probe, now when I record the probe, the interaction probe has with the newly added pump is not triggered. I tried my best to search for this, but I couldn't find any.
One way would be to trigger both via optoisolators that trigger individual MOSFETs to allow current from separate sources to the lasers. Connect the diode of each optoisolator in series, so at the trigger moment, both diodes are producing light which enables the isolated output section, and in turn enables current through each MOSFET and laser. That way, each laser can have a different current as required by the type of laser and output desired.
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