Optical Frequency Comb as a general-purpose and wide-band calibration source for astronomical high resolution infrared spectrographs
| Autor: | Andrea Tozzi, Ernesto Oliva, Carlo Baffa, Elisabetta Giani, Pablo Cancio Pastor, Giulia Schettino, Massimo Inguscio |
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| Rok vydání: | 2011 |
| Předmět: |
Physics
Optical Frequency Combs (OFCs) Near-IR astronomical spectrographs Spectrometer Infrared business.industry Physics::Optics Astronomy and Astrophysics Dielectric Laser law.invention Optical frequency Combs (OFCs) Near infrared astronomical spectrographs Optics General purpose Space and Planetary Science law Calibration Optoelectronics Wide band Optical frequency comb business |
| Zdroj: | Experimental astronomy 31 (2011): 69–81. doi:10.1007/s10686-011-9232-7 info:cnr-pdr/source/autori:Schettino Giulia [ 1,2 ] ; Oliva Ernesto [ 2 ] ; Inguscio Massimo [ 1,3,4 ] ; Baffa Carlo [ 2 ] ; Giani Elisabetta [ 2 ] ; Tozzi Andrea [ 2 ] ; Cancio Pastor Pablo [ 3,4 ]/titolo:Optical Frequency Comb as a general-purpose and wide-band calibration source for astronomical high resolution infrared spectrographs/doi:10.1007%2Fs10686-011-9232-7/rivista:Experimental astronomy (Print)/anno:2011/pagina_da:69/pagina_a:81/intervallo_pagine:69–81/volume:31 |
| ISSN: | 1572-9508 0922-6435 |
| DOI: | 10.1007/s10686-011-9232-7 |
| Popis: | A spectrally filtered Optical Frequency Comb (OFC) laser is proposed as a versatile calibration source for astronomical spectrometers in the 1-2 mu m spectral range. Such a source overcomes the limitations of current calibration lamps providing a uniform spectrum of equally spaced lines with similar intensity and extremely high long-term frequency stability. We present preliminary studies and results of a system which filters the OFC from a 100 MHz comb spacing to 16 GHz one, an adequate spacing for spectrometers with resolving power Delta lambda/lambda > 30000. The first approach employs two Fabry-Perot cavities in series, made of dielectric coated mirrors, followed by a non-linear optical broadening system. The limitations of such a filtering process are discussed. These can be overcome by the second approach, based on filtering cavities with metallic coated mirrors. |
| Databáze: | OpenAIRE |
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