  A crucial step towards enabling real-world applications for quantum sensing
devices such as Rydberg atom electric field sensors is reducing their size,
weight, power, and cost (SWaP-C) requirements without significantly reducing
performance. Laser frequency stabilization is a key part of many quantum
sensing devices and, when used for exciting non-ground state atomic
transitions, is currently limited to techniques that require either large
SWaP-C optical cavities and electronics or use significant optical power solely
for frequency stabilization. Here we describe a laser frequency stabilization
technique for exciting non-ground state atomic transitions that solves these
challenges and requires only a small amount of additional electronics. We
describe the operation, capabilities, and limitations of this frequency
stabilization technique and quantitatively characterize measure its
performance. We show experimentally that Rydberg electric field sensors using
this technique are capable of data collection while sacrificing only 0.1% of
available bandwidth for frequency stabilization of noise up to 900 Hz.
