Abstract

We experimentally evaluated a cadmium-telluride $\left(\mathrm{CdTe}\right)$ crystal as the nonlinear crystal for generation and detection of terahertz (THz) radiation by using a femtosecond-pulse laser. Numerical simulations based on the nonlinear Maxwell equations, including third-order optical dispersion within the spectral width of an optical pulse and absorption in the THz frequency region, well reproduce both the amplitude and phase spectra of the emitted THz wave. Excitation wavelength dependences of the THz radiation from the $\mathrm{CdTe}$ crystal indicate that the phase-matched condition is satisfied at a wavelength of $1000\mathrm{nm}$. We also experimentally demonstrated a THz generation and detection system using a $1045\mathrm{nm}$ Yb-doped ultrashort-pulse fiber laser, and we verified that $\mathrm{CdTe}$ is one of the most suitable nonlinear crystals for a Yb-doped fiber laser.

© 2007 Optical Society of America

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