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Apodized aperiodically poled LiNbO3 waveguide was fabricated by varying the duty cycle of sampled χ(2) grating. Broadband 3 μm difference frequency generation and gas spectroscopy were demonstrated using the device.
We have succeeded in capturing two-dimensional spatial vector distribution of terahertz electric-feld by the spinning electro-optic sensor method combined with a CCD camera, which is useful for terahertz polarization imaging and terahertz vector beam analysis.
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