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Terahertz generations were demonstrated in periodically poled lithium niobate and lithium tantalate crystals around 1-2 THz. Different forward and backward terahertz radiations are possible in periodically poled structures via difference frequency generation within the ultra-broad pump laser. The generated THz pulses could be controlled by the quasi-phase matching structures.
An effective means of achieving a portable, ultrafast blue-light source using a variety of nonlinear media is demonstrated. We investigate the relative merits of aperiodically-poled bulk and waveguide nonlinear crystals in comparison to periodically-poled structures.
Summary form only given. To develop a simple technique for imaging hidden objects embedded in or behind a scattering medium is challenging for many applications (e.g. biomedicine). One of the promising techniques developed is to use short pulse Raman gating in hydrogen for detection of unscattered photons, which carry the least degraded image information. For practical purposes however, Raman imaging...
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