Abstract
Abstract— We report a terahertz (THz) wave amplifier based onoptical parametric processes in magnesium-oxide-doped lithiumniobate crystals. The amplifier operates atroomtemperatureandhasagainof55dB.Thenon-linearcrystalsused for the purposes of emission and amplification of the THzwaves are pumped separately using a microchip laser, whichleads to an enhancement of the gain in comparison with existingapproaches. Index Terms— Nonlinear crystal, parametric sources, terahertz(THz) wave. I. I NTRODUCTION T HE development of optoelectronics and laser tech-nologies has enabled the generation of terahertz (THz)electromagnetic(EM)waves,andwideavarietyofapplicationshave been demonstrated in the fields including biomedicine,communication, and non-destructive testing [1]–[3]. However,to solve real-world problems by expanding the application ofTHz waves, high-power THz sources and high-sensitivity THzdetectors are required. The emission of high-power THz waveshas received much recent research attention. Various methods,including optical rectification of femtosecond pulses in non-linear inorganic and organic crystals, such as lithium niobateLiNbO or 4-N,N-dimethylamino-4 -N -methyl-stilbazoliumtosylate (DAST), have been reported to generate high-powerTHzwaves[4]–[6].ThesemethodscanproduceTHzEMwaveswith peak electric fields of a few megavolts per centimeter(MV/cm). In addition, injection-seeded parametric generationof THz wavewith apeak powerofa few tens ofkilowatts(kW)hasrecentlybeenreported[7].Thesesourceshavebeenappliedin wide range of research fields, including THz imaging andspectroscopy. Despite the improved performance, it remainsdifficult to obtain THz spectra and transmission-based images
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