Potassium Dihydrogen Phosphate (KDP) crystals are commonly used for second harmonic generation of Nd:YAG lasers at room temperature. The fundamental light wavelength is 1.06 microns. Assuming 100% efficiency:
a) Compare the wavelength of light before and after the crystal.
b) Compare the energy of a single photon of the incident beam and SHG beam.
c) Discuss this effect in terms of the energy conservation law.
(10 points) Using two KDP crystals, can one get the following light?
3rd harmonics of the fundamental wave? If yes, how?
What is the wavelength of this light? If not, why not?