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| Format: | Preprint |
| Published: |
2025
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| Online Access: | https://arxiv.org/abs/2503.07336 |
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| _version_ | 1866916648331509760 |
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| author | Talukder, Muhammad Anisuzzaman |
| author_facet | Talukder, Muhammad Anisuzzaman |
| contents | Two-photon terahertz (THz) quantum cascade lasers (QCLs) can immensely improve the conventional applications of THz frequency sources and open windows to new applications due to their ability to generate quantum-entangled twin photon beams. The rich intrinsic non-linearity in a two-photon THz QCL arises from cascaded photon transitions, leading to time-resolved and frequency-resolved dynamics that are less predictable. This work investigates the time- and frequency-resolved dynamics of a resonant two-photon THz QCL by numerically solving the coupled Maxwell-Bloch equations. Our findings indicate that the output intensity is significantly higher, and the emission spectra are much broader in a two-photon THz QCL than in a conventional one-photon THz QCL. Additionally, a pronounced Risken-Nummedal-Graham-Haken (RNGH) instability onsets for a resonant two-photon QCL at a smaller pumping current. We also observe an increase in the number of lasing modes, as well as a higher power per line in a resonant two-photon QCL. Furthermore, Rabi splitting is observed in the emission spectra at high pumping currents. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_07336 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Time- and frequency-resolved dynamics of resonant two-photon terahertz quantum cascade lasers Talukder, Muhammad Anisuzzaman Optics Quantum Physics Two-photon terahertz (THz) quantum cascade lasers (QCLs) can immensely improve the conventional applications of THz frequency sources and open windows to new applications due to their ability to generate quantum-entangled twin photon beams. The rich intrinsic non-linearity in a two-photon THz QCL arises from cascaded photon transitions, leading to time-resolved and frequency-resolved dynamics that are less predictable. This work investigates the time- and frequency-resolved dynamics of a resonant two-photon THz QCL by numerically solving the coupled Maxwell-Bloch equations. Our findings indicate that the output intensity is significantly higher, and the emission spectra are much broader in a two-photon THz QCL than in a conventional one-photon THz QCL. Additionally, a pronounced Risken-Nummedal-Graham-Haken (RNGH) instability onsets for a resonant two-photon QCL at a smaller pumping current. We also observe an increase in the number of lasing modes, as well as a higher power per line in a resonant two-photon QCL. Furthermore, Rabi splitting is observed in the emission spectra at high pumping currents. |
| title | Time- and frequency-resolved dynamics of resonant two-photon terahertz quantum cascade lasers |
| topic | Optics Quantum Physics |
| url | https://arxiv.org/abs/2503.07336 |