High-resolution, high-efficiency narrowband spectroscopy with an s-p-phased holographic grating in double pass
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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866918061013991424 |
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| author | Jentink, Casper Farret Pepe, Francesco Lovis, Christophe Schwab, Christian Wildi, François Clawson, Andrew |
| author_facet | Jentink, Casper Farret Pepe, Francesco Lovis, Christophe Schwab, Christian Wildi, François Clawson, Andrew |
| contents | High-resolution spectroscopy (R>50,000) in astronomy typically uses echelle-type spectrographs, which excel for exoplanet detection via radial velocity but compromise throughput for atmospheric characterization. We propose and test a novel method to achieve very high spectral resolution with significantly higher throughput within a limited bandpass using a tuned, high fringe-density volume phase holographic (VPH) grating in double pass. Using a wavelength-tunable laser, we measured the dispersion and diffraction efficiency of this setup, finding that our tested VPH grating reaches a diffraction-limited resolving power >140,000 in double pass with a peak diffraction efficiency of 79% for unpolarized light. Based on current manufacturing capabilities, we estimate double-pass diffraction efficiencies >50% with resolving powers >200,000 are achievable from visible to near-infrared wavelengths, limited only by detector size. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_11147 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High-resolution, high-efficiency narrowband spectroscopy with an s-p-phased holographic grating in double pass Jentink, Casper Farret Pepe, Francesco Lovis, Christophe Schwab, Christian Wildi, François Clawson, Andrew Instrumentation and Methods for Astrophysics Earth and Planetary Astrophysics High-resolution spectroscopy (R>50,000) in astronomy typically uses echelle-type spectrographs, which excel for exoplanet detection via radial velocity but compromise throughput for atmospheric characterization. We propose and test a novel method to achieve very high spectral resolution with significantly higher throughput within a limited bandpass using a tuned, high fringe-density volume phase holographic (VPH) grating in double pass. Using a wavelength-tunable laser, we measured the dispersion and diffraction efficiency of this setup, finding that our tested VPH grating reaches a diffraction-limited resolving power >140,000 in double pass with a peak diffraction efficiency of 79% for unpolarized light. Based on current manufacturing capabilities, we estimate double-pass diffraction efficiencies >50% with resolving powers >200,000 are achievable from visible to near-infrared wavelengths, limited only by detector size. |
| title | High-resolution, high-efficiency narrowband spectroscopy with an s-p-phased holographic grating in double pass |
| topic | Instrumentation and Methods for Astrophysics Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2505.11147 |