We describe an intracavity Fabry-Perot etalon for frequency stabilization and tuning of a single-mode quasi-continuous-wave ring laser. Taking into account the pulse duration and the 40-Hz repetition rate of our laser, we achieve stabilization by 266-kHz modulation of 100-V peak-to-peak voltage applied to the electro-optic crystal. Tuning is ensured by the presence of a gain loop that contains a lock-in amplifier reacting with a multimorphous ceramic by means of 0–300-V dc voltage, which causes slight rotation of the Fabry–Perot etalon. A continuous frequency scan of 6 GHz was made that potentially can be extended to .
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