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We produce tunable (1.3-3THz) narrow-band THz-wave output with >130μW average power in periodically-inverted GaAs inside a near-degenerate type-0 PPLN OPO containing thin YAG etalon for spectral control, synchronously pumped by a 1064-nm 10-ps Yb-fiber laser.
Terahertz (THz) wave generation based on nonlinear frequency conversion is promising way for realizing a tunable monochromatic bright THz-wave source. Such a development of efficient and wide tunable THz-wave source depends on discovery of novel brilliant nonlinear crystal. Important factors of a nonlinear crystal for THz-wave generation are, 1. High nonlinearity and 2. Good transparency at THz frequency...
We have developed a continuous wave (CW) terahertz (THz) wave generation by near infrared laser diode (NIR-LD) pumping based on non-collinear phase-matched difference frequency generation (DFG) in a GaP crystal. The THz output power is improved at suitable length of GaP and NIR beam spot size. By using this generator, we measured spectra with high resolution.
In the present paper, we report the generation of mid-IR short-pulse in spectral range of 10 ~ 40 mum (7.5 ~ 30 THz) using DAST(4- dimethylamino-N-methyl-4-stilbazolium tosylate) crystal and the difference frequency is generated.
Terahertz pulse were generated in periodically poled lithium niobate and lithium tantalate around 1.4 and 0.6 THz with band-width off 20 GHz. The generated intensity was rapidly increased depending on temperature decreasing of the crystal.
Organic nonlinear crystals are most promising materials for efficient THz wave generation using DFG as well as TDS. Two kinds of organic crystals : 4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) and N-benzyl-2-methyl-4-nitroaniline (BNA) are investigated for ultrawide THz-wave generation. New THz applications will be presented using frequency-agile THz sources.
We investigated methods for improvement of continuous-wave (CW) terahertz (THz) output power by laser diode (LD) pumping in noncollinear phase-matched difference frequency generation (DFG). The effects of interaction length and beam spot size of input lasers (near-IR) in GaP crystals were studied. The THz wave power dependence on various sizes of GaP crystals was investigated and it was observed that...
We present calculations concerning the generation of terahertz waves by difference frequency generation (DFG) using mid-infrared (MIR) radiation. We investigate phase matching conditions using a waveguide design for semiconductor materials like GaAs, GaP, InP or InAs which are transparent for both MIR and THz radiation and exhibit a large nonlinear coefficient.
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