Tunable 30 GHz laser frequency comb for astronomical spectrograph characterization and calibration
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arXiv
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| Format: | Preprint |
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2024
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| author | Sekhar, Pooja Kreider, Molly Kate Fredrick, Connor Ninan, Joe P Bender, Chad F Terrien, Ryan Mahadevan, Suvrath Diddams, Scott A |
| author_facet | Sekhar, Pooja Kreider, Molly Kate Fredrick, Connor Ninan, Joe P Bender, Chad F Terrien, Ryan Mahadevan, Suvrath Diddams, Scott A |
| contents | The search for earth-like exoplanets with the Doppler radial velocity technique is an extremely challenging and multifaceted precision spectroscopy problem. Currently, one of the limiting instrumental factors in reaching the required long-term $10^{-10}$ level of radial velocity precision is the defect-driven sub-pixel quantum efficiency variations in the large-format detector arrays used by precision echelle spectrographs. Tunable frequency comb calibration sources that can fully map the point spread function across a spectrograph's entire bandwidth are necessary for quantifying and correcting these detector artifacts. In this work, we demonstrate a combination of laser frequency and mode spacing control that allows full and deterministic tunability of a 30 GHz electro-optic comb together with its filter cavity. After supercontinuum generation, this gives access to any optical frequency across 700 - 1300 nm. Our specific implementation is intended for the comb deployed at the Habitable Zone Planet Finder spectrograph and its near-infrared Hawaii-2RG array, but the techniques apply to all laser frequency combs used for precision astronomical spectrograph calibration and other applications that require broadband tuning. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_02627 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Tunable 30 GHz laser frequency comb for astronomical spectrograph characterization and calibration Sekhar, Pooja Kreider, Molly Kate Fredrick, Connor Ninan, Joe P Bender, Chad F Terrien, Ryan Mahadevan, Suvrath Diddams, Scott A Optics Instrumentation and Methods for Astrophysics The search for earth-like exoplanets with the Doppler radial velocity technique is an extremely challenging and multifaceted precision spectroscopy problem. Currently, one of the limiting instrumental factors in reaching the required long-term $10^{-10}$ level of radial velocity precision is the defect-driven sub-pixel quantum efficiency variations in the large-format detector arrays used by precision echelle spectrographs. Tunable frequency comb calibration sources that can fully map the point spread function across a spectrograph's entire bandwidth are necessary for quantifying and correcting these detector artifacts. In this work, we demonstrate a combination of laser frequency and mode spacing control that allows full and deterministic tunability of a 30 GHz electro-optic comb together with its filter cavity. After supercontinuum generation, this gives access to any optical frequency across 700 - 1300 nm. Our specific implementation is intended for the comb deployed at the Habitable Zone Planet Finder spectrograph and its near-infrared Hawaii-2RG array, but the techniques apply to all laser frequency combs used for precision astronomical spectrograph calibration and other applications that require broadband tuning. |
| title | Tunable 30 GHz laser frequency comb for astronomical spectrograph characterization and calibration |
| topic | Optics Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2408.02627 |