Gain Switched Cr ~ (4 +): Mg <sub> 2 </ Sub> Of Sio <sub> 4 </ Sub> Laser And Cr ~ (4 +): Yag Laser

With the development of the Cr -doped crystals and the successful working of pertinent lasers, the study of them has become one of the hot pots of the study of the solid tunable lasers. These two crystals such as Cr4+:Mg2SiO4 and Cr4+:YAG will hopefully become the ideal gain medium of tunable lasers in the near infrared wavelengths, and the study of them will be the most important. With the theoretical and experimental methods, the paper studies the time characteristics of gain-switched Cr4+:YAG and Cr4+:Mg2SiO4 laser.Chapter 1: The paper appraises the laser characteristics of Cr4+ ions in several garnet host crystals, especially the important characteristics and the application in laser devices of Cr4+:YAG and Cr4+:Mg2SiO4 and the general research situation.Chapter 2: Pumped by 1.06um Q-switched Nd:YAG laser, gain-switching of Cr4+:Mg2SiO4 laser is realized. And the output energy and the pulse width of the central wavelength of 1.25 um are 0.4mJ, 32ns. By studing the time characteristics of gain-switching of Cr4+:Mg2SiO4 laser with the rate equations theoretically, we calculate the formulas of the pulse width, and the theoretical parameters are consistent with the experimental results approximately.Chapter 3: A theoretical study is devoted to the parameters of the three-mirror cavity. By using ABCD ray transmission matrix, an optimized folding angle is obtained to compensate astigmatism, so. that the beam of the output mirror is ensured to be Guass basic mode, and the stable condition is calculated. Using 1.06um Nd:YAG laser pumping the three-mirror cavity Cr4+:Mg2SiO4 laser, the output energy and the pulse width of the gain-switched 1.44 um laser are 0.46mJ, 28ns.Chapter 4: The dual-wavelength laser is achieved of 1.06um and 1.44um in the designed compound resonator. The Cr4+:YAG is operated as a saturable absorber and a gain medium simultaneously. The output energy and the pulse width of 1.06 um and 1.44um are 6.8mJ, 38ns and 0.04mJ, 21ns respectively. By using the pertinent parameters of Cr4+:YAG crystal, the pulse width of 1.44 um are analyzed theoretically and the results are consistent with the experimental data.