Two-colour balanced optical cross-correlator using fibre-coupled PPLN waveguides
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866910980391305216 |
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| author | Christie, Jonathan Henderson, James R. Snedden, Edward W. Corner, Laura |
| author_facet | Christie, Jonathan Henderson, James R. Snedden, Edward W. Corner, Laura |
| contents | We present a two-colour fully fibre-coupled balanced optical cross-correlator (BOXC) based on sum-frequency generation (SFG) between 1560 nm and 800 nm laser pulses using waveguides implemented in type-0 phase-matched periodically poled LiNbO$_{3}$ (PPLN) crystals. The interaction has an effective nonlinear coefficient of $d_{eff}$ = 16.1 pm/V, many times higher than comparable nonlinear crystals used for this SFG interaction such as barium borate (BBO). The resulting sensitivity of the cross-correlator is measured to be 5.11 mV/fs, five times greater than current bulk-optic BOXCs after accounting for differences in transimpedance gain and photodetector responsivity, with the potential for significantly higher sensitivity after optimisations to the cross-correlator design. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_01812 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Two-colour balanced optical cross-correlator using fibre-coupled PPLN waveguides Christie, Jonathan Henderson, James R. Snedden, Edward W. Corner, Laura Optics Accelerator Physics Instrumentation and Detectors We present a two-colour fully fibre-coupled balanced optical cross-correlator (BOXC) based on sum-frequency generation (SFG) between 1560 nm and 800 nm laser pulses using waveguides implemented in type-0 phase-matched periodically poled LiNbO$_{3}$ (PPLN) crystals. The interaction has an effective nonlinear coefficient of $d_{eff}$ = 16.1 pm/V, many times higher than comparable nonlinear crystals used for this SFG interaction such as barium borate (BBO). The resulting sensitivity of the cross-correlator is measured to be 5.11 mV/fs, five times greater than current bulk-optic BOXCs after accounting for differences in transimpedance gain and photodetector responsivity, with the potential for significantly higher sensitivity after optimisations to the cross-correlator design. |
| title | Two-colour balanced optical cross-correlator using fibre-coupled PPLN waveguides |
| topic | Optics Accelerator Physics Instrumentation and Detectors |
| url | https://arxiv.org/abs/2506.01812 |