Abstract
A simple arrangement is presented for the improved wavelength tunability, mode recognition and stabilization of commercial single mode laser diodes. A glass plate with or without a partially reflective coating is mounted in front of the laser diode chip. The plate acts as the low-reflectivity mirror of an extended resonator and helps to select particular longitudinal modes within the gain profile even where laser action is not possible without the feedback. Mode selection is performed by piezoelectric tuning of the external cavity. Mode recognition is achieved by the measurement of the reflected intensity from a second very thin glass plate in the laser beam acting as a low-finesse etalon. The intensity pattern from the etalon is used for mode stabilization of the arrangement.
Published Version
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