Efficient extracavity Nd:YAG/BaWO₄Raman laser

Abstract

Abstract:The output properties of an efficient extracavity BaWO4 Raman laser are investigated. An actively Q-switched Nd:YAG laser is used as the pumping source. The pulses have a pulse width of 11.7 ns and an energy up to 80 mJ. The Raman laser cavity is a flat-flat one. Four output couplers with different reflectivities for the first and second Stokes wavelengths are used in the experiment. The relations between the output pulse energy and the pumping pulse energy are measured. With an incident pulse energy of 66.2 mJ, the obtained maximum pulse energy of the first Stocks is 39.9 mJ, the corresponding conversion efficiency is 60.4%. When the pump pulse energy is 64.6 mJ, the obtained maximum pulse energy of the second Stocks is 22.8 mJ, the corresponding conversion efficiency is 35.3%. Dependence of the first Stokes pulse conversion efficiency on the incident pump pulse energy for different output couplers

1240 nm diamond Raman laser operating near the quantum limit

“…The external cavity configuration has the practical advantage of being easily adapted to existing pump laser systems, while it also allows straightforward determination of the efficiency of the Raman conversion step. Conversion of 1064 nm using other Raman crystals in external cavities is well documented, with conversion efficiencies from 1064 nm to the first Stokes in barium nitrate of 60% [5] and in barium tungstate of 62.6% [6]. In diamond, an external-cavity laser pumped in the visible (532 nm) has been shown to have efficiency of up to 65%, slightly higher than the reported efficiencies of other materials despite the slightly higher quantum defect [7].…”

885 nm LD end-pumped 22.7 W high beam quality electro-optical Q-switched Nd:YAG laser

“…It is easy for side pumped Nd:YAG to achieve high power 1064 nm laser, but the o o efficiency in TEM 00 mode operation is relatively low, typically between 10% and 15% [8][9][10][11][12]. In comparison, end pumping can reach higher o o efficiency in TEM 00 mode oper ation.…”

LD-pumped Nd:GdVO4 Raman laser at 1166 nm with LiIO3 crystal

“…In the past few years, the SRS lasers rapidly developed, many crystals such as Ba(NO 3 ) 2 [1], BaWO 4 [2,3], SrWO 4 [4][5][6], KGd(WO 4 ) 2 [7,8], and KLu(WO 4 ) 2 [9] have been widely used in Raman lasers to generate new wavelength lights, which have been proved to be efficient and reliable Raman crystals.…”