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We demonstrated backward terahertz-wave parametric oscillation and used optical injection for the forward-propagating idler to increase the output power, reduce the threshold, and stabilize the oscillation.We generated backward-propagating terahertz-wave pulses with a high peak intensity of about 200 W at 0.3 THz.Terahertz-wave imaging was performed using our developed backward terahertz-wave parametric oscillator to confirm its suitability for nondestructive testing applications.Due to the long-time stability of terahertz-wave oscillation, transmission images with good visibility and inside information were obtained by point scanning imaging.As a result of measuring various materials, we found that the system is applicable to versatile nondestructive inspection applications.
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Minamide et al. (2022) studied this question.
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