Transformation and amplification of light modulated by a traveling wave with a relatively low frequency
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arXiv
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866913479615578112 |
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| author | Sumetsky, M. |
| author_facet | Sumetsky, M. |
| contents | The behavior of electromagnetic waves in a medium modulated in time and space, largely investigated decades ago, has recently attracted renewed interest. Here, we solve an intriguing problem of this research: can light with an initial frequency $ω_0$ be amplified in a realistic photonic circuit solely pumped by a traveling wave with a much lower frequency $ω_p \ll ω_0$? Generally, the bandwidth of the modulation-induced optical frequency comb spectrum can be substantially broadened when the phase velocity of the traveling wave, $v_p$, approaches the phase velocity of light, $v_0$. However, in realistic photonic waveguides, the amplification effect remains small due to the unfeasible modulation and waveguide parameters required. In contrast, we demonstrate that modulating an optical resonator with a traveling wave that has a small phase velocity $v_p \ll v_0$ (rather than a synchronous $v_p \approx v_0$) can result in narrow-band light amplification, which is dramatically enhanced near the Brillouin phase-matching condition $ω_p/v_p \approx 2ω_0/v_0$. Our calculations show that the proposed amplifier of light can be realized in a lithium niobate racetrack resonator with millimeter-scale perimeter modulated by a surface acoustic wave with surprisingly small and practically achievable amplitude. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_19117 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Transformation and amplification of light modulated by a traveling wave with a relatively low frequency Sumetsky, M. Optics The behavior of electromagnetic waves in a medium modulated in time and space, largely investigated decades ago, has recently attracted renewed interest. Here, we solve an intriguing problem of this research: can light with an initial frequency $ω_0$ be amplified in a realistic photonic circuit solely pumped by a traveling wave with a much lower frequency $ω_p \ll ω_0$? Generally, the bandwidth of the modulation-induced optical frequency comb spectrum can be substantially broadened when the phase velocity of the traveling wave, $v_p$, approaches the phase velocity of light, $v_0$. However, in realistic photonic waveguides, the amplification effect remains small due to the unfeasible modulation and waveguide parameters required. In contrast, we demonstrate that modulating an optical resonator with a traveling wave that has a small phase velocity $v_p \ll v_0$ (rather than a synchronous $v_p \approx v_0$) can result in narrow-band light amplification, which is dramatically enhanced near the Brillouin phase-matching condition $ω_p/v_p \approx 2ω_0/v_0$. Our calculations show that the proposed amplifier of light can be realized in a lithium niobate racetrack resonator with millimeter-scale perimeter modulated by a surface acoustic wave with surprisingly small and practically achievable amplitude. |
| title | Transformation and amplification of light modulated by a traveling wave with a relatively low frequency |
| topic | Optics |
| url | https://arxiv.org/abs/2402.19117 |