Mode-locked operation has been observed in a Q-switched, ruby laser using a quartz crystal as the passvie mode-locking element and a laser cavity length which is a whole fraction of that which is commensurate in mode-frequency spacing with the lowfrequency stimulated Brillouin scattering (lf S BS) in the crystal element. In addition, high-bit-rate operation has been observed, suggesting that the passive modulation of the lf S BS process is sufficiently strong to maintain a fixed-phase relation between several neighboring oscillating modes of the laser.
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Mangla, B.S., Cassedy, E.S. Passive mode locking of a ruby laser using a birefringent crystal and a fractional-commensurate cavity length. Appl. Phys. 11, 171–174 (1976). https://doi.org/10.1007/BF00920599