Fig. 1. Schematic of LD end pumped and passively Q-switched Nd∶YAG/Cr4+∶YAG microchip laser

Fig. 2. Experimental device of LD end pumped and passively Q-switched Nd∶YAG/Cr4+∶YAG microchip laser

Fig. 3. Output pulse time jitter versus α

Fig. 4. Output pulse time jitters when repetition rate is 100 kHz but for different α. (a) α=0°; (b) α=45°

Fig. 5. Output pulse sequences when repetition rate is 100 kHz but for different α. (a) α=0°; (b) α=45°

Fig. 6. Single pulse waveform when repetition rate is 100 kHz but for different α. (a)α=0°; (b) α=45°

Fig. 7. Output beam quality and far-field beam spot shape of microchip laser

Fig. 8. Output laser extinction ratio versus α

Fig. 9. Structural diagram of three orientations of Cr4+ in Cr4+∶YAG crystal

Fig. 10. Absorption spectrum of Cr4+∶YAG crystal at room temperature