We report a novel application of self-injection locking. A diode laser is i
njection locked to its own frequency-shifted emission. By resonant phase mo
dulation of the fed-back Light, the laser's emission frequency is shown to
swing periodically through the locking range. The laser operates as a sweep
generator driven by resonant self-injection locking. (C) 1999 Optical Soci
ety of America OCIS codes: 140.3520, 140.3490, 060.2430, 060.2310, 060.2630
, 060.5060.