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In this communication we have investigated and compared the tuning abilities of an ECDL system, using a grating in Littrow configuration, depending on the laser diode (LD) used. We have achieved experimentally a wide continuous frequency tuning range by applying translation-rotational movement of the grating together with appropriate injection current correction. The fluorescence spectrum of Rb in the vicinity of 780 nm has been recorded in an external absorption cell. The wide mode-hop free frequency tuning gave us the possibility to reach exactly the maximum of each fine component of the Rb D2 line. By scanning the applied magnetic field strength, sub-natural width resonance (SNWR), with FWHM in the kHz range, have been observed in the fluorescence signal and in the transmitted output power. Such resonance is very appropriate for measuring weak magnetic fields.
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Andreeva et al. (2001) studied this question.
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