Investigation on 447.3nm blue-violet laser by extra-cavity frequency doubling of a diode-pumped cesium vapor laser

447.3nm blue-violet lasers are investigated by extra-cavity single-pass second harmonic generation (SHG) of diode-pumped cesium vapor lasers (Cs-DPALs) using a LBO crystal. Two types of 894.6nm Cs-DPAL are constructed, and the beam quality factors are Mx2=1.02, My2=1.13 and Mx2=2.13, Mx2=2.66, respectively. The maximum output powers for the two types of Cs-DPAL operating in pulsed mode are 0.692W and 2.6W, and the corresponding maximum second harmonics (SH) powers are 9.5μW and 11.2μW at optimal focusing parameter of 1.68, respectively. The relative insensitivity of SH power to the LBO crystal temperature and the influence of Cs laser beam quality on the SHG efficiency are analyzed qualitatively. •447.3nm blue-violet lasers by frequency doubling of Cs-DPALs are demonstrated.•Two types of Cs-DPAL with output powers of 0.692W and 2.6W are constructed.•SH powers of 9.5μW and 11.2μW for the two Cs-DPALs are obtained, respectively.•The insensitivity of SH power to the LBO temperature is qualitatively discussed.•The influence of Cs laser beam quality on the SHG efficiency is analyzed.