Diode-laser Double-end-pumped Cavity-dumped1.06μm Laser

Diode-Laser pumped high repetition rates and short pulse width solid-state lasershave advantages as high peak power and good beam quality. So they have a broadapplication in many fields, such as military, medical treatment, precision machining andmany other areas and become the focus in the scientific research. The thermal load of879nm LD is smaller than808nm, so it can reduce the thermal effects of the crystal.With high repetition rate, cavity-dumped can obtain the short pulse width output whichhas no relation with the gain and the repetition rate. Double-end-pumped can increasethe incident pump power, so that it can obtain high output power. Based on the abovetheories, this paper studies on the characteristics of diode-laser double-end-pumpedcavity-pumped1.06μm laser, including the end-pumped Acousto-Optic (A-O)Q-switched, the double-end-pumped A-O Q-switched, and the double-end-pumped A-Ocavity-dumped.Based on the Q-switched rate equation, the paper educed the parameter expressionsof peak power, pulse energy and pulse width and simulated the relationship betweeninitial invertion population density and pulse parameters. Additionally, the paper educedthe expressions of temperature gradient and thermal stress distribution, and simulatedthe relationship between the pump beam waist, power and the temperature gradient.Besides, the paper used LASCAD to simulate the thermal load, temperature and stressand then obtained the conclusion that using the879nm LD and double-end-pumped canreduce the thermal effects of the crystal and improve the incident pump power.In the experiments, the paper researched on the output laser characteristics under879nm LD end-pumped and double-end-pumped A-O Q-switched. In the end-pumpedA-O Q-switched experiment, the continuous output power is20.7W, at the repetitionrate of10kHz, the pulse width is9.3ns, the corresponding peak power is68.0kW. Atthe repetition rate of100kHz, the average output power is14.9W. In thedouble-end-pumped A-O Q-switched experiment, the continuous output power is26.0W, at the repetition rate of10kHz, the pulse width is8.5ns, the corresponding peakpowers is115.3kW. At the repetition rate of100kHz, the average output power is21.1W. Comparing the two experiments, the paper obtained that doubled-end-pumped isbetter than end-pumped. It can improve the continuous output power, average outputpower and compress the pulse width. In addition, the paper researched on the output laser characteristics under879nmLD double-end-pumped A-O cavity-dumped. In the double-end-dumped A-Ocavity-dumped experiment, at the repetition rate of10kHz, the average output power is2.0W; the pulse width is13.5ns. At the repetition rate of100kHz, the average outputpower is4.2W; the pulse width is16.3ns. With the repetition rate increasing, theaverage output power is improving, but the pulse width is almost unchanged. This resultcan show that the cavity-dumped have excellent performance in high-repetition-rateoperation.