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Lasers with well controlled relative frequencies are indispensable for manyapplications in science and technology. We present a frequency offset lockingmethod for lasers based on beat frequency discrimination utilizing hybridelectronic LC filters. The method is specifically designed for decoupling thetightness of the lock from the broadness of its capture range. The presenteddemonstration locks two free running diode lasers at 780 nm with a 5.5 GHzoffset. It displays an offset frequency instability below 55 Hz for timescalesin excess of 1000 s and a minimum of 12 Hz at 10 s averaging, outperforming thebest reported instabilities of methods based on beat frequency discrimination.The performance is complemented with a 190 MHz lock capture range, a tuningrange of up to 1 GHz, and a frequency ramp agility of 200 kHz/$\mu$s.

Laser frequency offset locking at 10-Hz-level instability using hybrid electronic filters