Ruby ring laser subjected to an external signal
A superregenerative amplification scheme was used to obtain unidirectional stimulated emission from a ruby ring laser under free-oscillation and Q-switched conditions. The duration of external control pulses was either tc > L/c or tc < L/c. The carrier frequency of giant pulses could be tuned within a range of 0.25 nm when the spectrum was 6×10–5 nm wide. Reproducible generation of short high-coherence light pulses was achieved.