Generation Of Q-switched Nd Research Articles

Noncritically Phase Matched Second Harmonic Generation and Wedged face Third Harmonic Generation of Q-switched Nd:YVO4 Laser Radiation

Noncritically Phase Matched Second Harmonic Generation and Wedged face Third Harmonic Generation of Q-switched Nd:YVO₄ Laser Radiation

PM567-Doped solid dye lasers based on PMMA

Polymers are a kind of attractive hosts for laser dyes due to their high transparency in both pumping and lasing ranges and superior optical homogeneity. In this paper solid dye samples based on polymethyl methacrylate (PMMA) doped with different concentrations of 1, 3, 5, 7, 8-pentamethyl-2, 6-diethylpyrromethene-BF2 (PM567) are prepared. The absorption, fluorescence and lasing spectra of the samples are obtained. Wide absorption and fluorescence bands are obtained and a red shift of the maxima of the lasing emission spectra is observed. With the second-harmonic generation of Q-switched Nd:YAG laser (532 nm, ~20ns) pumping the samples longitudinally, the slope efficiencies of the samples are obtained. There is an optimal dye concentration for the highest slope efficiency when the pumping energy is lower than some typical value (~250 mJ), and the highest slope efficiency 35.6% is obtained in the sample with a dye concentration of 2 × 10−4 mol/L. Pumping the samples at a rate of 10Hz with a pulse energy as high as 200 mJ (the fluence is 0.2 J/cm2), the output energy drops to one-half of its initial value after approximate 15500 pulses and the normalized photostability is 5.17 GJ/mol. A kind of solid dye laser which could have some applications is built.

Efficient second harmonic generation of Q-switched Nd:YAG laser radiation using LiNbO3 with 2 mol% MgO doping

Abstract A noncritically phase-matched second harmonic generation (SHG) of 532 nm radiation from 1064 nm radiation in LiNbO3 doped with 2 mol% MgO has been investigated by using a Q-switched Nd:YAG laser with a pulse duration of 52 ns. SHG conversion efficiencies of 50% were typically achieved with a 10.3 mm long crystal and a fundamental peak-power density of 32 MW/cm2. It was found that any optical index inhomogeneities were not induced for more than 2 h operation of SHG under the fundamental power density of 32 MW/cm2.

High power LD pumped solid-state laser and the second harmonic generation(SHG) of a Q-switched solid-state laser pumped with LD.

Using a “multiple-facet end-pumped” (MFEP) structure, we efficiently obtained high power from an LD-pumped Nd: YAG laser, the maximum output power of 5.4W at a pumping power of 16W. With an end-pumped structure, the second harmonic generation of Q-Switched Nd: YAG and Nd: YLF lasers with KTP, BBO, and LBO crystals is also described. The maximum average power of 110mW was obtained for the second harmonics of an Nd: YLF laser in BBO at a pumping power of 840mW.