Ba(NO3)2 external resonator Raman laser excited by 532 nm laser

Barium nitrate crystal was proposed as one of the perspective Raman materials due to its intense symmetrical vibrations with the frequency of 1 047 cm-1 and comparative high Raman gain. A harmonic of Nd:YAG laser (532 nm) pumped barium nitrate crystal in external resonator and excited stimulated Raman laser. Experimental setup adopted the Raman shifter consisted of external cavity and two prisms spectrometer. The external cavity was composed of diachronic mirrors with optimal reflectivity for Stokes components. Barium nitrate crystal was grown by the aqua-solution cooling method with the size of 48 mm×10 mm×10 mm. When the pump laser energy is 65 mJ, the output energy of first Stokes laser (563 nm) and that of second Stokes laser (599 nm) were measured as 21 mJ and 16 mJ respectively. Th