(c) Determine the phase-matching angle for potassium dihydrogen phosphate (KDP) for second harmonic generation, where an input laser beam of wavelength 1064 nm is propagating at an angle, ̘, to the optic axis, z, of the uniaxial crystal. The laser is linearly polarized along the axis x. Relevant refractive indices for KDP nₒ(1064 nm) = 1.494, nₒ(532 nm) = 1.512 and nₑ(532 nm) = 1.471.