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
∼
72.5
M
H
z
and free spectral region of
∼
16
G
H
z
. Using this scheme, arbitrary
frequency locking of a laser with an adjustable frequency resolution
of
2.34
G
H
z
/
∘
C
is realized, and MHz-level long-term
stability is demonstrated.