Injection-seeded backward terahertz-wave parametric oscillators at 0.3 and 0.5 THz bands for nondestructive imaging applications

Yuma Takida; Kouji Nawata; Takashi Notake; Hiroaki Minamide

doi:10.1117/12.2626827

31 May 2022 Injection-seeded backward terahertz-wave parametric oscillators at 0.3 and 0.5 THz bands for nondestructive imaging applications

Yuma Takida, Kouji Nawata, Takashi Notake, Hiroaki Minamide

Author Affiliations +

Proceedings Volume 12134, Terahertz Photonics II; 121340C (2022) https://doi.org/10.1117/12.2626827
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

We have demonstrated injection-seeded backward terahertz (THz)-wave parametric oscillators (BW-TPOs) based on a slant-strip-type periodically poled lithium niobate (PPLN) crystal with two different poling periods. The BW-TPOs were pumped by sub-nanosecond pump pulses at 1064 nm and designed for generating backward-propagating THz waves around 0.30 and 0.46 THz with PPLN poling periods of 53 and 35 μm, respectively. As a result of an optical injection seeding for the forward-propagating idler wavelength in the BW-TPO process, we achieved over a 1000-fold enhancement in backward-propagating THz-wave output energy, a 63% reduction of the oscillation threshold, and long-term stable operation compared to the unseeded case. Furthermore, we demonstrated that the oscillation frequency of backward-propagating THz waves is continuously tunable in the range of 0.27–0.35 and 0.41–0.52 THz for the poling periods of 53 and 35 μm, respectively, by angle tuning of the PPLN crystal in parallel with seed wavelength tuning. Using the developed injection-seeded BW-TPOs, we also performed the THz-wave imaging test in transmission geometry for various materials, including glass, wood, and liquids.

Conference Presentation

Citation Download Citation

Yuma Takida, Kouji Nawata, Takashi Notake, and Hiroaki Minamide "Injection-seeded backward terahertz-wave parametric oscillators at 0.3 and 0.5 THz bands for nondestructive imaging applications", Proc. SPIE 12134, Terahertz Photonics II, 121340C (31 May 2022); https://doi.org/10.1117/12.2626827

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