8 May 2007 Detection of coherent tunable THz-wave using of stimulated polariton scattering in MgO:LiNbO3
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We report the experimental results of generation and coherent detection of narrow linewidth tunable terahertz radiation at room temperature utilizing a difference frequency generation as a result of stimulated scattering in the nonlinear crystal of MgO:LiNbO3. The terahertz radiation was generated from an all-solid-state tunable injection-seeded THz-wave parametric generator (is-TPG), which emits the monochromatic THz-wave over a wide tunable frequency range from 0.6 THz to 2.4 THz with the linewidth of narrower than 100 MHz. Mixing of terahertz radiation (frequency &ohgr;T ) with a near-infrared intense pump pulse (frequency &ohgr;P ) results in the excitation and amplification of the difference frequency component with frequency &ohgr;i =&ohgr;P -&ohgr;T, which is detected with a InGaAsbased photodiode. We demonstrate this method a fast response and very sensitive THz-wave detection running at room temperature, which is at least three of magnitude faster and two of magnitude more sensitive than a typical Liquid-He cooling Si bolometer for detecting the quasi-cw THz-wave beam. This detection technique is possible for coherent detection, it can measure the THz electric field, not only the intensity. As a result, the phase information is preserved, the real and imaginary parts of a sample's dielectric function may be determined simultaneously with this detection.
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Ruixiang Guo, Ruixiang Guo, Tomofumi Ikari, Tomofumi Ikari, Hiroaki Minamide, Hiroaki Minamide, Hiromasa Ito, Hiromasa Ito, } "Detection of coherent tunable THz-wave using of stimulated polariton scattering in MgO:LiNbO3", Proc. SPIE 6582, Nonlinear Optics and Applications II, 65820Z (8 May 2007); doi: 10.1117/12.722990; https://doi.org/10.1117/12.722990

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