Generation of high-frequency terahertz waves in periodically poled LiNbO3 based on backward parametric interaction

摘要

Backward terahertz pulses at high frequencies are generated in multi-period periodically poled LiNbO3 using ultrafast pulses of a regenerative amplifier. The highest frequencies generated by us are centered at 4.8 THz at the poling period of 7.1 μm, corresponding to the output wavelength of 62.5 μm. Enhancement factors as large as 61 in the output powers are achieved and analyzed due to resonance-enhanced nonlinear optical coefficients.