Abstract

A simple method for laser frequency stabilizing by a temperature-tuned Fabry–Perot etalon is reported. The etalon is a plano–convex lens that permits tuning the length and refractive index via controlling the temperature for shifting wavelengths in the region of 852 nm, with a transmission spectral linewidth of ${\sim}{72.5}\;{\rm{MHz}}$ and free spectral region of ${\sim}{{16}}\;{\rm{GHz}}$. Using this scheme, arbitrary frequency locking of a laser with an adjustable frequency resolution of $2.34\;{\rm{GHz}}/^\circ {\rm{C}}$ is realized, and MHz-level long-term stability is demonstrated.

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