The Recent Development of SRS and SRS SF-Conversion Laser Crystal
Although tungstates posses lower coefficient of thermal conductivity, tungstates doped with active ions have higher quanta efficiency of fluorescence owing to their higher doping concentration of active ions resulted from the higher covalence of WO 4 2− units. Therefore, they are favorable for the medium of low power laser when doped with active ions. On the other hand, they have higher stimulated Raman scattering (SRS) plus in a general way. Therefore, tungstates doped with active ions can serve as a SRS self-frequency conversion multifunctions laser medium. After wide surveys of known research on the growth, crystal structure, and properties including optical and spectra characteristics and laser property, this chapter reviews the recent advances in the development of KGd(WO4)2 and SrWO4 Raman and SRS self-frequency conversion laser crystal. The SRS self-frequency conversion laser technology was dealt with. As a result, the Raman and self-Raman laser outputs with high efficiency at ~1,180 nm wavelength and its frequency-doubling laser outputs at ~590 nm wavelength have been achieved.
KeywordsCrystal growth KGd(WO4)2 and SrWO4 crystals Optical properties Raman and SRS self-frequency conversion laser properties
Some works of this chapter were supported by National Nature Science Foundation of China (No.50902129, 61078076, 91122033), Major Projects from FJIRSM (SZD09001), the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KJCX2-EW-H03), Science and Technology Plan Major Project of Fujian Province of China (Grant No. 2010I0015).
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