Fig. 1. Schematic diagram of the 1 kHz injection-seeded, Q-switched Er:YAG laser.

Fig. 2. CW output power of the slave laser versus the pump power.

Fig. 3. Average output power of the single-frequency, injection-seeded laser as a function of PRF.

Fig. 4. (a) Heterodyne beating signal and the FFT spectrum of the heterodyne beating signal in injection-seeded output direction. (b) Heterodyne beating signal and the FFT spectrum of the heterodyne beating signal in un-injection-seeded output direction.

Fig. 5. Output energy of the single-frequency, injection-seeded laser with suppression mirror as a function of the pump power.

Fig. 6. Pulse build-up time of the single-frequency, injection-seeded laser with M18 as a function of the pump power.

Fig. 7. (a) Heterodyne beating signal of the single-frequency, injection-seeded laser. (b) FFT of the heterodyne beating signal with self-feedback as a function of the pump power.

Fig. 8. M2 factors of the single-frequency, injection-seeded, Q-switched laser.

Fig. 9. Fluctuation of the output energy at the highest output level.