Intracavity frequency-doubled Nd:YAG/KLu(WO4)2 Raman laser at 589 nm: A potential source for sodium D2 resonance radiation

An intracavity frequency-doubled Raman laser emitting at 589 nm by using a KLu(WO4)2 Raman medium was realized within a diode-side-pumped Q-switched Nd:YAG laser for the first time. The KLu(WO4)2 crystal generates the first-Stokes laser at 1178 nm, and a KTP crystal frequency doubles the 1178-nm laser to 589-nm laser. Under an incident diode power of 125 W and a pulse repetition rate of 10 kHz, the 589-nm power of 4.33 W was obtained, corresponding to a diode-to-yellow laser conversion efficiency of 3.5% and a minimum pulse width of 38 ns. The linewidth was about 0.2 nm and the M2 factors are measured to be 4.9 and 5.0 in the horizontal and vertical directions, respectively.

► Diode-side-pumped frequency-doubled Nd:YAG/KLu(WO4)2 Raman laser at 589 nm was firstly demonstrated.
► Output power of 4.33 W was achieved at the pulse repetition rate of 10 kHz and pump power of 125 W.
► 38 ns pulse width of 589 nm laser was obtained at the maximum output power.
► Frequency-doubled Nd:YAG/KLu(WO4)2 Raman laser is a potential source for sodium D2 resonance radiation.