From ultra-noisy to ultra-stable: optimization of the optoelectronic laser lock
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866918259604848640 |
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| author | Nakamura, Takuma Liu, Yifan Jin, Naijun Cheng, Haotian McLemore, Charles Hoghooghi, Nazanin Rakich, Peter Quinlan, Franklyn |
| author_facet | Nakamura, Takuma Liu, Yifan Jin, Naijun Cheng, Haotian McLemore, Charles Hoghooghi, Nazanin Rakich, Peter Quinlan, Franklyn |
| contents | We demonstrate thermal-noise-limited direct locking of a semiconductor distributed feedback (DFB) laser to a sub-1 mL volume, ultrastable optical cavity, enabling extremely compact and simple ultrastable laser systems. Using the optoelectronic laser locking method, we realize over 140 dB suppression of the DFB free-running laser noise at 10 Hz offset, a level we estimate to be ~ 70 dB greater than Pound-Drever-Hall locking can provide, and reach a phase noise level of -120 dBc/Hz at 200 kHz offset. We also demonstrate a new feedforward noise correction method that improves the quality of the heterodyne beat with an optical frequency comb by providing another 60 dB of laser noise rejection - a level that is 15 dB greater than predicted by current models. With feedforward, we transfer the cavity thermal noise limit across the comb spectrum despite the fact that the cavity-locked laser itself is noisy. These results establish a simple, low noise, compact approach to ultrastable laser locking that is compatible with integrated photonics, with applications in low phase noise microwave generation, sensing, and satellite ranging. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_14956 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | From ultra-noisy to ultra-stable: optimization of the optoelectronic laser lock Nakamura, Takuma Liu, Yifan Jin, Naijun Cheng, Haotian McLemore, Charles Hoghooghi, Nazanin Rakich, Peter Quinlan, Franklyn Optics We demonstrate thermal-noise-limited direct locking of a semiconductor distributed feedback (DFB) laser to a sub-1 mL volume, ultrastable optical cavity, enabling extremely compact and simple ultrastable laser systems. Using the optoelectronic laser locking method, we realize over 140 dB suppression of the DFB free-running laser noise at 10 Hz offset, a level we estimate to be ~ 70 dB greater than Pound-Drever-Hall locking can provide, and reach a phase noise level of -120 dBc/Hz at 200 kHz offset. We also demonstrate a new feedforward noise correction method that improves the quality of the heterodyne beat with an optical frequency comb by providing another 60 dB of laser noise rejection - a level that is 15 dB greater than predicted by current models. With feedforward, we transfer the cavity thermal noise limit across the comb spectrum despite the fact that the cavity-locked laser itself is noisy. These results establish a simple, low noise, compact approach to ultrastable laser locking that is compatible with integrated photonics, with applications in low phase noise microwave generation, sensing, and satellite ranging. |
| title | From ultra-noisy to ultra-stable: optimization of the optoelectronic laser lock |
| topic | Optics |
| url | https://arxiv.org/abs/2505.14956 |