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. 2019 Jan 24;9:726. doi: 10.1038/s41598-018-37068-7

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Measured spectra of pump and idler waves. Blue, green, and red lines show the spectra for the angle α of 64.2°, 67.0°, and 69.8°, respectively. (b) Measured THz-wave intensity through the etalon cavity as a function of scanning distance at angle α of 67.0°. Red and blue solid lines show the experimental and numerical results, respectively. The PPLN with grating period of 53 μm was used for both measurements. (c) Measured pulse widths of the pump, idler, and THz-wave.