Abstract
An efficient and widely tunable Si-prism-array coupled terahertz-wave parametric oscillator (TPO) with a very narrow linewidth is demonstrated by using a shallow surface cross-pump configuration. The shallow surface cross-pum** form was realized by totally reflect the pump beam at the THz-wave exit surface. Widely THz-wave tuning range of 0.6–3.9 THz is realized with a 1-mm diameter pump, and the high-frequency end even reached 5.5 THz with a 2-mm diameter pump to increase the nonlinear gain length. The measured Stokes linewidth was 0.07 nm, which is compressed by 70% for that of the conventional TPOs. The highest THz-wave output energy of 2.4 μJ was achieved at 2 THz under 15 mJ pum**, corresponding to an energy conversion efficiency of 1.6 × 10−4. The mechanism of the frequency-selection effect in cross-pumped stimulated polariton scatterings was discussed by calculating the single-pass parametric gain for different phase mismatches.
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Funding
This research is supported by the National Natural Science Foundation of China (NSFC) (61905223, 11904327), and the Henan Science and Technology Development Plan Project (182102310616, 202102210318).
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Zhang, R., Geng, L., Zhang, Z. et al. Widely Tunable Terahertz-Wave Parametric Oscillator with a Shallow Surface Cross-pump Configuration. J Infrared Milli Terahz Waves 42, 851–862 (2021). https://doi.org/10.1007/s10762-021-00816-4
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DOI: https://doi.org/10.1007/s10762-021-00816-4