Dual-Core Optical Fibers for Efficient Mid-Infrared Generation via Third Order Frequency Mixing and Coupling-Length Phase Matching
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866909206794207232 |
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| author | Su, Jing Biaggio, Ivan |
| author_facet | Su, Jing Biaggio, Ivan |
| contents | Appropriately designed dual-core fibers using coupling-length phase matching (CLPM) allow for phase-matched frequency downconversion over wide frequency intervals using the third-order optical nonlinearity of glass. By tuning the distance between the two cores, CLPM allows continuously tunable phase matching for widely different wavelengths for the process in which a pump wave at a frequency $ω_2$ generates or amplifies two waves with frequencies $ω_3>ω_2$ and $ω_1 = 2 ω_2 - ω_3$. The intensity-dependent correction that accounts for nonlinear phase-modulation is derived in general. In addition, a specific CLPM configuration is found to be insensitive to phase-modulation, and can achieve 100\% theoretical quantum yield for pump wave injection in one core. Fiber-based frequency converters can thus be designed for large differences between pump wavelengths and generated wavelengths, with the phase-matched interaction enabling the use of meter-long fibers to compensate for low third-order susceptibilities. Examples of fiber designs for pump wavelengths at 1.3 and 1.55 $μ$m, to generate radiation with wavelengths longer than 2 $μ$m, are discussed for silica and fluoride fibers. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2405_11090 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Dual-Core Optical Fibers for Efficient Mid-Infrared Generation via Third Order Frequency Mixing and Coupling-Length Phase Matching Su, Jing Biaggio, Ivan Optics Appropriately designed dual-core fibers using coupling-length phase matching (CLPM) allow for phase-matched frequency downconversion over wide frequency intervals using the third-order optical nonlinearity of glass. By tuning the distance between the two cores, CLPM allows continuously tunable phase matching for widely different wavelengths for the process in which a pump wave at a frequency $ω_2$ generates or amplifies two waves with frequencies $ω_3>ω_2$ and $ω_1 = 2 ω_2 - ω_3$. The intensity-dependent correction that accounts for nonlinear phase-modulation is derived in general. In addition, a specific CLPM configuration is found to be insensitive to phase-modulation, and can achieve 100\% theoretical quantum yield for pump wave injection in one core. Fiber-based frequency converters can thus be designed for large differences between pump wavelengths and generated wavelengths, with the phase-matched interaction enabling the use of meter-long fibers to compensate for low third-order susceptibilities. Examples of fiber designs for pump wavelengths at 1.3 and 1.55 $μ$m, to generate radiation with wavelengths longer than 2 $μ$m, are discussed for silica and fluoride fibers. |
| title | Dual-Core Optical Fibers for Efficient Mid-Infrared Generation via Third Order Frequency Mixing and Coupling-Length Phase Matching |
| topic | Optics |
| url | https://arxiv.org/abs/2405.11090 |