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The effect of a magnetic field on the enhancement of the efficiency of terahertz (THz) generation on the surface of narrow-gap semiconductors is analyzed. A novel small-size THz generator is proposed. It consists of two permanent magnets with opposite magnetization placed on a yoke forming Kittel structure. The construction provides magnetic field concentration in the active zone of a semiconductor placed closely on top of the magnets. Its capabilities of converting femtosecond pulses of the first and second harmonics of an erbium fiber laser are investigated by THz time-domain spectrometer. n-InAs and n-InSb semiconductors in the magnetic field of 0.8 T prove to be the best THz generators at 775- and 1550-nm pump wavelengths correspondingly.
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Antsygin et al. (2015) studied this question.
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