Think carefully Fred
Fred,
You need to not only read the text again but think through how the light beam would be affected by the reaction of the material being radiated. Esteban's method is correct and logical.
Now I am skeptical of you Fred. The light beam is being modulated just as if it were hitting a mirror that was shaking. In a way it's similar to the old system of using a long spring to create reverb in a guitar amplifier.
Thank you for being patient Esteban. Keep up the good work.
Randy
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