Correction of broadband terahertz electro-optic sampling with GaSe crystals
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915417396609024 |
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| author | Ogawa, Kotaro Kanda, Natsuki Murotani, Yuta Tanaka, Shunsuke Yoshinobu, Jun Matsunaga, Ryusuke |
| author_facet | Ogawa, Kotaro Kanda, Natsuki Murotani, Yuta Tanaka, Shunsuke Yoshinobu, Jun Matsunaga, Ryusuke |
| contents | Gallium selenide (GaSe) is an efficient nonlinear crystal for electro-optic (EO) sampling in the multi-terahertz (THz) frequency range. However, the lattice resonance at several THz frequencies hampers broadband EO sampling, resulting in distorted pulse waveforms. In this work, we experimentally evaluated the frequency-dependent response function in EO sampling, considering the effects of phonons, phase mismatch, and gate pulse waveforms. The phonon effect is described using an effective Faust-Henry coefficient, which was determined to be $-0.21 \pm 0.02$. The corrected field amplitude of multi-THz pulses aligns with additional measurements of average power and a beam diameter. The successful compensation of the frequency characteristics in GaSe will contribute to a more accurate evaluation of multi-THz transients. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_07242 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Correction of broadband terahertz electro-optic sampling with GaSe crystals Ogawa, Kotaro Kanda, Natsuki Murotani, Yuta Tanaka, Shunsuke Yoshinobu, Jun Matsunaga, Ryusuke Optics Gallium selenide (GaSe) is an efficient nonlinear crystal for electro-optic (EO) sampling in the multi-terahertz (THz) frequency range. However, the lattice resonance at several THz frequencies hampers broadband EO sampling, resulting in distorted pulse waveforms. In this work, we experimentally evaluated the frequency-dependent response function in EO sampling, considering the effects of phonons, phase mismatch, and gate pulse waveforms. The phonon effect is described using an effective Faust-Henry coefficient, which was determined to be $-0.21 \pm 0.02$. The corrected field amplitude of multi-THz pulses aligns with additional measurements of average power and a beam diameter. The successful compensation of the frequency characteristics in GaSe will contribute to a more accurate evaluation of multi-THz transients. |
| title | Correction of broadband terahertz electro-optic sampling with GaSe crystals |
| topic | Optics |
| url | https://arxiv.org/abs/2505.07242 |