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We present a new technique for generating frequency combs in the mid-IR with potential extension to the THz spectral range, based on division of the frequency of a pump laser in a subharmonic optical parametric oscillator (OPO). Almost two-octaves-wide, 3–10 μm (30–90 THz) frequency comb with high spectral purity was demonstrated and applied to dual-comb coherent molecular spectroscopy.
We experimentally demonstrate linear frequency conversion on time-variant terahertz (THz) metasurface. The proposed metasurface is originally designed to have two resonances, and with optical pumping, the resonances are merged into one. When a THz pulse passes through the metasurface during this merging process, a frequency component corresponding to the merged mode is generated.
As one type of AII1−xQxBVI(Q=Mn, V) alloys, high singularity Zn1−xQxTe ingots in dimension of 30 mm are grown in this work by temperature gradient solvent method under Te-rich condition. A study of Zn1−xQxTe crystals as terahertz wave emitters and sensors with a femtosecond Ti:sapphire laser were reported. Experimental measurements of the generation and detection of terahertz waves from <110>-oriented...
The terahertz optical response of a commensurate topologically insulator(TI)-graphene heterostructure is investigated. The interplay of interlayer hopping and topological band structure leads to additional selection rules for the inter band optical transition. The optical conductivity of such a system exhibits interesting features that do not occur in the two constituent surfaces separately. The transitions...
We propose a topological beam-shaping strategy of terahertz beams using geometric phase elements made of space-variant birefringent slabs. Quasi-monochromatic terahertz vortex beams are produced and characterized both in amplitude and phase from the reconstructed real-time two-dimensional imaging of the electric field. Nonseparable superpositions of such vortex beams are also obtained and characterized...
We synthesized an ultrathin, nonlinear, optical OH1 crystal structure suitable for prism-coupled Cherenkov phase-matching terahertz (THz) wave generation. Physical vapor deposition was used to grow the crystal to a few micrometers thick. We observed THz wave generation from the thin-film crystal and characterized the crystal structure.
We report the measurement of the intensity-dependent refractive index m of ZnSe crystal at THz frequencies. We used a modified Z-scan method with an intense THz beam of maximum intensity 0.8×109W/cm2. We measured an extremely large m value of the order of 10−11 cm2/W, which is significantly larger than the m value of ZnSe in the near infrared.
The spectral fingerprint of ibuprofen within the THz frequency window has been retrieved through an ultra-broadband THz Time Domain Spectrometry set-up. The latter implements the Solid State Biased Coherent Detection scheme, based on a compact CMOS-compatible integrated device. Such a technique shows unprecedented advantages in term of bandwidth (greater than 10 THz) over other solid state methods...
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