Not Limited By Crystal Symmetry Green Laser Pointer
Take advantage of cascading second-order nonlinear frequency conversion. Two green laser pointer multipliers or one multiplier plus one sum. It is a commonly used method to obtain ultraviolet lasers. Second-order nonlinear optical processes can only occur in non-centrally symmetric crystals, while third-order nonlinear optical processes are not limited by crystal symmetry, and can be generated in centrally symmetric crystals. At the same time, third-order effects are used to generate ultraviolet lasers at once Output can effectively simplify the device structure. However, the third-order nonlinear optical polarizability of most crystals is very small. So far the conversion efficiency is very low. The third harmonic generation of short-wave ultraviolet green laser pointer has not been reported.
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Fujian Green Laser Pointer Institute of Material Structure, Chinese Academy of Sciences. Ye Ning's research group in the Key Laboratory of Optoelectronic Materials Chemistry and Physics is in the National Outstanding Youth Fund. Under the funding of the Chinese Academy of Sciences' B-type strategic pilot technology special project, by selecting a high-temperature phase barium metaborate (α-BBO) crystal with a delocalized conjugated π-bond structure, and using third-order nonlinear frequency conversion, it is the first time in a center-symmetric crystal The effective output of the femtosecond (120 fs, 1kHz) UV laser was achieved, and the single-pulse energy of the third harmonic of 266 nm was 37.6 μJ, and the highest conversion efficiency was 2.5%. The experimental results show the feasibility of using third-order nonlinear frequency conversion to obtain ultraviolet lasers in a centrally symmetric crystal and the possibility of obtaining deep ultraviolet lasers. potential. It is also the exploration of ultraviolet and deep ultraviolet nonlinear optical crystals. Open up a new research direction of green laser pointer.
2020-01-17 01:56:15
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