| Blue laser has a prominent future of getting application in underwater communication,due to the low absorption transmission window exists in water. Blue laser also has its application in a wide range of categories, such as high-density information storage, laser cooling of atoms, and medical science, etc. Technologies of manufacturing blue laser are still immature compared with that of green laser or infrared laser. And the immature puts limit on the application of blue laser. Popular ways of generating blue laser including dye laser,optical parameter oscillator, and frequency-doubling of infrared solid laser. Recently,generating blue laser by near-resonating four-wave mixing in rubidium vapor has attracted more and more attentions of researchers. The energy levels 52D5/2?62P3/2 are involved in the four-wave mixing, and the four-wave mixing process can be seen as a kind of mirror-less laser.Nanosecond pulsed 778.1 nm?420.3 nm conversion has been realized in the work of this issue. The conversion is realized in hot rubidium vapor and gives collimated 420.3 nm blue laser beam. The energy conversion efficiency can exceed 1% when a 45 cm, 170 ?heated rubidium vapor cell is applied as the conversion medium. By analyzing the relationship of the output and the pumping wavelengths, and other properties of the output beam, the conversion is attributed to a four-wave mixing mechanism. Coefficients affecting the conversion efficiency such as cell temperature, cell length, buffer gas and pumping pulse energy are studied carefully for optimizing the energy and efficiency of generating blue laser beam. |
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