Highly efficient diode-pumped passively Q-switched Nd:YVO₄/KGW Raman lasers at yellow and orange wavelengths

Abstract

Efficient diode-pumped passively Q-switched Nd:YVO4 yellow and orange lasers are developed with the pulse pumping scheme and the intracavity stimulated Raman scattering (SRS) and second harmonic generation (SHG). A Np-cut KGW is exploited in the SRS process to generate the yellow 579 nm laser or the orange 589 nm laser in a selectable way. The high efficiency is achieved by designing a compact resonator to include a coupled cavity for intracavity SRS and SHG and to provide a focused beam waist on the saturable absorber for reaching an excellent passive Q-switching. The output pulse energy and peak power can reach 0.08 mJ and 50 kW for the orange laser at 589 nm. On the other hand, the output pulse energy and peak power can be up to 0.10 mJ and 80 kW for the yellow laser at 579 nm.

Anisotropic Raman spectral analysis and laser output based on large-sized scheelite bismuth molybdate tungstate mixed crystals

“…The anisotropy of distorted lowsymmetrical structures also makes the crystals superior platforms for designing novel devices with new and composite functions, such as controlling the laser emission through selecting appropriate crystal sample orientations, and simultaneous multi-wavelength Raman laser output. [24][25][26][27] By using molybdate or tungstate as Raman crystals, plentiful achievements have been obtained in generating multi-band lasers and simultaneous multi-wavelength laser output. 26,[28][29][30][31] Meanwhile, rare earth ion doped molybdate or tungstate crystals can also be regarded as laser host media, indicating that the doped crystals have great potential in selfexcited Raman crystals as well.…”

Top-seeded solution growth, spectral analysis and laser properties of a novel Nd-doped Bi2Mo2.66W0.34O12 crystal

“…[22][23][24][25][26][27] Besides, crystals in this family were also observed to have large third-order nonlinear susceptibility for stimulated Raman scattering (SRS) and have been demonstrated as efficient Raman shifters, examples can be seen in molybdates, like SrMoO 4 , 28 CaMoO 4 , 28 and PbMoO 4 , 28,29 and tungstates, like BaWO 4 , [30][31][32][33] SrWO 4 , 34 and KGd(WO 4 ) 2 . [35][36][37][38][39][40][41] Combining both the outstanding performances as laser host and Raman laser materials, rare-earth doped scheelite crystals can be used for generating self-stimulated Raman lasers. 42 In addition, crystals of this family are usually very prone to fracture along a specific crystallographic plane, making the crystals in this family promising materials for microchip lasers.…”