Fig. 1. Schematic diagram of infrared laser experiment

Fig. 2. Schematic diagram of ultraviolet laser experiment

Fig. 3. Absorption efficiency of Nd∶YVO₄ crystal to pump light at wavelength of 915 nm

Fig. 4. Comparison of infrared laser with different pump wavelengths

Fig. 5. Characteristics of Nd∶YVO₄ crystal. (a) Absorption spectrum of Nd∶YVO₄ crystal at room temperature^[18]; (b) schematic diagram of energy level transition in Nd∶YVO₄ crystal^[13]

Fig. 6. Variation of output power with input power

Fig. 7. Output pulse shape of ultraviolet laser with center wavelength of 355 nm

Fig. 8. Output laser spot of ultraviolet laser with center wavelength of 355 nm

Fig. 9. Power stability test of ultraviolet laser with center wavelength of 355 nm within 6 hours