Abstract
The blue and red light lasers play an important role in data storage, biomedical and full colors display. We can use the nonlinear optic crystals to get the red and blue light lasers by changing the wavelength of the pump lasers. Moreover, the development of quasi-phase matching technology can make the enhancement of the efficiency to get the blue and red lasers.The dissertation was devoted to fabricating the periodically poled lithium niobate, lithium magnesium-oxide-doped lithium niobate and lithium tantalite (PPLT) crystals. Considering about the difficulties in making the materials and the optical damage threshold of crystals, we choose the LT crystal to generate the blue and red lasers. In order to get better cycle ratios, we need to test LT on the coercive field, stabilization time and parameters on other fabrications. After testing under different circumstances, we had succeeded in fabricating 4 cm-long, 5.5 mm-width and 0.55 mm thickness fan out PPLT crystal by change the poling voltage. Therefore, we could change the wavelength of lasers by shifting the position where the pump laser hits into the crystal. When pumped with the 1064 nm and 532nm line, the crystal produces 670 nm and 2592 nm lines through optical parametric generation and 414 nm line through sum frequency generation. When the pump pulse energy is 2 mJ, the conversion efficiency of the red and blue light is 29.5%. and 0.145%. By shifting the position where pump laser hits into the crystal (the temperate of the oven is 80 ℃) the wavelength of the single is from 674.8 nm to 676.8 nm. It is hoped that we could get better efficiency of the blue light lasers in shorten cycle fabrication.