A diode side-pumped acousto-optic Q-switched Nd:YAP laser operating at 1.3414 microm has been reported. The stabilities of resonators and the influence of the temperature of cooling water on output power have been experimentally investigated. The average output powers and pulse widths with different couplers and repetition rates have also been measured and analyzed. Under the repetition rate of 5 kHz, a maximum average output power of 47.5 W was obtained with an optical-optical conversion efficiency of 8.6% and a slope efficiency of 20.2%. The peak power and the pulse width were 48.8 kW and 195 ns FWHM. The beam quality factors M(2) directed along the a and c axes were 22 and 28, respectively.

No abstract

The oscillation mechanism of dual-wavelength Nd:YAG Q-switched laser with two-mirror resonator is studied on the basis of the rate equation. The characteristics of the dual-wavelength laser are discussed by analysing the competition process with different transmissivities. Results show that the oscillating time of the Q-switched pulse laser for 1319nm laser is delayed relative to that of 1064nm. The 1319nm Q-switched laser is formed finally from the first relaxation oscillation spike after the Q-switch opening, i.e. it restrains the rest relaxation oscillation spikes. The transmissivity of relatively balanced output energy is theoretically obtained.