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This work describes the measurement of the frequency response of the wavelength modulation in a laser diode, for application in a closed-loop interferometer. The wavelength modulation is derived by the measurement of the interferometric phase, while the frequency response is estimated by means of frequency-domain model identification techniques.
A new method for characterizing the wavelength/frequency response of tunable lasers is presented. The wavelength dependence on a driving signal is measured by means of a simple self-mixing interferometric setup, just made by the laser itself and a photodiode. An example of extended-cavity laser-diode characterization is presented, and the results obtained with the new measurement method are in good...
An extended-cavity laser diode was used to perform high resolution spectroscopy of molecular absorption lines of hydrogen iodide. For the first time, this laser source was frequency locked to an HI transition at 1.5 mum using the wavelength modulation technique. Preliminary measurements of the closed-loop error signal provided a relative frequency stability of' 2times10-9 in a 10 Hz acquisition bandwidth
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