Abstract
We directly observed terahertz (THz) waves generated in a cascading manner under noncollinear phase-matching conditions in a THz parametric generator. Although cascading induced by collinear phase matching has been extensively studied, cascading featuring noncollinear phase matching, using devices such as our injection-seeded THz parametric generator (is-TPG), has received less attention. However, an understanding of is-TPG cascading is required not only for the further development of THz-wave sources but also for THz-range parametric detection and amplification; direct observations are essential. Here, we used a high-power seed beam to induce cascading efficiently; when the crystal was tilted, we detected new higher-order THz waves near the end face. To the best of our knowledge, no previous study has described THz waves generated by cascading under noncollinear phase-matching conditions. We present empirical data that will greatly aid the theoretical exploration of parametric TH-wave generation. Our work paves the way toward enhancement of the output powers of THz sources.
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Data Availability
The datasets generated and analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
Authors appreciate the fruitful discussions with Dr. S. Hayashi of NICT.
Funding
This work was partially supported by Japan Science and Technology Agency (JST) FOREST Program (JPMJFR212J); Japan Society for the Promotion of Science KAKENHI (19H02627, 22H00212, 22J20963); Foundation of Public Interest of Tatematsu; The Naito Science and Engineering Foundation; and Konica Minolta Science and Technology Foundation.
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Conceptualization, K.M.; methodology, S.M. and K.M.; formal analysis, S.M.; data curation, S.M. and K.M.; writing—original draft preparation, S.M. and K.M.; writing—review and editing, K.K and K.M.; visualization, S.M. and K.M.; supervision, K.M.; project administration, K.M.; funding acquisition, K.K. and K.M. All authors have read and agreed to the published version of the manuscript.
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Mine, S., Kawase, K. & Murate, K. Cascaded Terahertz Parametric Generation Under Noncollinear Phase-Matching Condition. J Infrared Milli Terahz Waves 45, 116–123 (2024). https://doi.org/10.1007/s10762-023-00962-x
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DOI: https://doi.org/10.1007/s10762-023-00962-x