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We propose THz-wave real-time imaging system with high resolution based on second harmonic generation in nonlinear organic DAST crystal. The spatial resolution is estimated to be less than ∼3×λTHz.
An ultrathin Terahertz (THz) quarter wave plate with high transmittance by flexible metamaterial is proposed in this paper. The device employs double layers of split ring resonator (SRR) with a polymer as the substrate. Due to the anisotropy of the SRR, it obtains a quarter wave plate with the transmittance of 0.72 and the ellipticity of 0.9994 at 0.854 THz from simulation. The device has a thickness...
A sensitive terahertz (THz)-wave detection based on a nonlinear up-conversion process in MgO:LiNbO3 crystal has been demonstrated by measuring the pulse energy of depleted pump wave. Spectroscopic measurements in the wide frequency range from 1.0 to 2.6 THz were achieved with a single optical detector. This method is independent of the output direction of noncollinear phase-matched up-conversion waves...
Metamaterial device with double layers of split ring resonators (SRRs) on flexible substrate is proposed for building a new terahertz (THz)-wave near-field imaging system with real-time performance. The SRRs work as an array of probes that reserve the object near-field information and transfer it to the detection system, which is based on the frequency up-conversion with nonlinear crystal DAST (4-dimethylamino-N-methyl-4-stilbazolium...
The frequency-doubling of a picosecond vortex fiber laser, formed of a 1-μm picosecond master laser and a large-mode-area fiber amplifier by using a nonlinear LiB3O5, crystal, was performed. A maximum second-harmonic power of 7.7 W was achieved, corresponding to a conversion efficiency of 31 %. The second harmonic had an annular spatial form owing to a phase singularity with a doubled topological...
High-power optical vortex lasers, featuring a doughnut-shaped spatial form and an orbital angular momentum (characterized by a topological charge, L) due to a spiral wavefront, have the potential to provide new technologies, such as the formation of chiral nano-structures [1]. To date, several researchers have demonstrated the production of high-power optical vortex outputs by a laser resonator with...
26.5W of nanosecond vortex laser based on a stressed Yb-doped fiber amplifier was demonstrated. The peak power of 70 kW was obtained, corresponding to optical-optical efficiency of 41 %.
An optical vortex, [1, 2] exhibiting attractive features, such as an annular spatial profile in the far-field and an orbital angular momentum due to a phase singularity, has been attracting much attention. In particular, high-power optical vortex pulses can explore potentially various technologies, including super-resolution microscopes [3] and material processing.
A high-power pico-second vortex output from a mixed-vanadate master laser and a Yb-doped fiber amplifier system was demonstrated. An output power of 25.3 W was achieved, corresponding to a peak power of 37.4 kW.
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