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We study the properties of a soliton crystal, a bound state of several optical pulses that propagate with a fixed temporal separation through the optical fibres of the proposed approach for generation of optical frequency combs (OFC) for astronomical spectrograph calibration. This approach - also being suitable for subpicosecond pulse generation for other applications - consists of a conventional...
Extremely accurate calibration of astronomical spectrographs for Earth-like extra-solar planet detection requires optical frequency combs with mode separation larger than 20 GHz [1]. While mode locked lasers are known to provide very stable combs, the appropriate spacing (>20 GHz) would require an unrealistic laser cavity size of 1 mm. Optical frequency combs (OFC) can also be generated by a cascade...
In this contribution, we present the VIMOS-IFU data analysis of two planetary nebulae: NGC 3242 and NGC 4361. Due to the technical nature of the workshop, we emphasize some specific problems of data reduction and analysis: accuracy in flux calibration, importance of scattered light and improvement of the S/N ratio. We estimate that accuracy of our flux calibration is ∼15% in the spectral range 4200–6100Å...
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