neoflash
Advanced Member level 1
https://en.wikipedia.org/wiki/Laser_Doppler_vibrometer
In this wiki page, it says that "The initial frequency of the laser is very high (> 1014 Hz), which is higher than the response of the detector. The detector does respond, however, to the beat frequency between the two beams."
This confused me that photodiode response to light intensity, not light's wavelength. Why diode has no response to the reference beam itself?
Thanks,
Neo
In this wiki page, it says that "The initial frequency of the laser is very high (> 1014 Hz), which is higher than the response of the detector. The detector does respond, however, to the beat frequency between the two beams."
This confused me that photodiode response to light intensity, not light's wavelength. Why diode has no response to the reference beam itself?
Thanks,
Neo