Laser frequency combs can provide thousands of laser lines with precisely known optical frequencies. Such laser frequency combs have already been recognized in the visible wavelength regime as enabling tools for astronomical spectrometer calibration with direct application for the search of extra-solar planets.
The objective of this project is to develop and test a novel broadband, near-infrared frequency comb source providing beyond state-of-the-art calibration to an emerging generation of near-infrared spectrometer (such as NIRPS and SPIROU). Based on electro-optic modulation, the proposed calibration source will intrinsically avoid systematic issues that have been encountered with conventional, mode-locked laser based frequency comb technology (which required spectral filtering). Moreover, the proposed source will be inherently robust and easy to operate as required for on-site astronomical operation.
Continuous spectrum and discrete optical calibration lines as seen by an astronomical spectrometer.[/caption]
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PlanetS involved Projects: 3A (atmosphere at high resolution), 3C (instrumentation high resolution), and 7C (internal structure of exoplanets). Contact in PlanetS: François Wildi, Dr. and François Bouchy, Prof. Dr..
NON-PlanetS partner: Swiss Center for Electronics and Microtechnology (CSEM), Time and Frequency Section. Contacts: Tobias Herr (email) and Steve Lecomte (email), CSEM, Jaquet-Droz 1, CH-2000 Neuchâtel.