期刊
TERAHERTZ PHOTONICS II
卷 12134, 期 -, 页码 -出版社
SPIE-INT SOC OPTICAL ENGINEERING
DOI: 10.1117/12.2626827
关键词
Terahertz wave; backward optical parametric oscillator; optical parametric oscillator; terahertz imaging; frequency tunable
资金
- Innovative Science and Technology Initiative for Security, ATLA, Japan [JPJ004596]
We have demonstrated injection-seeded backward terahertz-wave parametric oscillators based on a periodically poled lithium niobate crystal. By optical injection seeding for the forward-propagating idler wavelength, we achieved a significant enhancement in backward-propagating THz-wave output energy and long-term stable operation. Furthermore, the oscillation frequency of backward-propagating THz waves can be continuously tuned by angle tuning of the crystal.
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 mu m, 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 mu m, 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.
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