Multi-line Transition And Selection Of Intra-cavity Frequency Mixing All-solid-state Nd:YAG Yellow Laser

There are four laser lines of Nd:YAG laser crystal at1.1μm band. That are1073.8nm,1112.1nm,1115.9nm and1122.7nm. These lines have relatively betterperformance, and the green and yellow lasers can be obtained from SHG/SFG ofthese fundamental wavelength. But stimulated radiation cross sections andwavelengths are very close to each other among1112.1nm,1115.9nm and1122.7nm. Thus it is easy to be influenced each other in the process ofintra-cavity-SHG/SFG, so that the stability of output power is poor and the outputwavelength can hop easily.The single wavelength green or yellow laser or multi-wavelength yellow lasersof LD-end-pumped Nd:YAG laser crystal are reported. The study works as follows:Theoretically: The laser performance is analyzed based on the multi-levelsystem of lines transition, and according to systematic performance requirement，the film system of cavity is designed to obtain1073.8nm,1112.1nm,1115.9nm and1122.7nm lasers, at first. Furthermore，the roles of etalon, BF and intra-cavity-SHGin laser spectral line suppression are studied。Experimentally：first of all, all solid-state Nd:YAG laser of thermal stability isdesigned，and its output laser spectrum is tested. Secondly，an nonlinear crystal isintroduced into cavity in order to gain multi-wavelength yellow laser. Finally, etalon and BF are inserted into laser cavity respectively in order to obtain SHG laser whichis single spectral line, and SHG/SFG lasers which are double spectral lines.