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Absorption coefficient is plotted vs wavelength following the measurement of transmission and reflection spectra on a single GaP plate.
THz output power was measured vs output wavelength for a single GaP plate. As discussed in the text, the modulations were caused by convolution between Fabry–Perot effect for THz wave and water-vapor absorption.
Output peak power vs wavelength: open circles—single GaP plate; squares—stacked two GaP plates; dots—stacked three GaP plates. For both of the stacked two and three plates, second-order nonlinear coefficients have same sign between adjacent plates.
Output peak power vs wavelength: squares—stacked two GaP plates; open circles—stacked three GaP plates. For both of the stacked two and three plates, second-order nonlinear coefficients have the opposite signs between adjacent plates.
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