Drafts by Alexis Salazar Chavarría
The linewidth associated to the wavelength of a laser beam is one of the most important parameter... more The linewidth associated to the wavelength of a laser beam is one of the most important parameters that characterizes a laser oscillator. However, frequencies associated to it are usually too high to be measured by conventional electronics. In this experiment, we discuss the implementation of a self-heterodyne technique to estimate the linewidth of an infrared laser diode by using an acousto-optic modulator as a frequency shifter and single-mode optical fibers with different lengths to introduce time delays and break the temporal correlation of two beams from the same laser source, giving the possibility to measure the spectral properties of the laser by using an optical spectrum analyzer. The obtained results by this technique and a future improvement for the proposed experimental setup are presented and discussed. The main result consists in verifying that the optical feedback (back-reflected radiation into the laser diode) does not allow a correct measurement of the radiation parameters.
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Drafts by Alexis Salazar Chavarría