© COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only. We report on comparative properties in deep UV region of two types of tunable deep UV lasers for applications in resonance Raman lidar. The first type of the tunable deep UV laser is based on frequency doubling of the output of an optical parametric oscillator (OPO) pumped by the third harmonics of a Q-Switched Nd-YAG laser. The second one is based on the generation of the third and fourth harmonics of a Ti:sapphire (Ti:S) laser, which is pumped by the second harmonics of a Q-Switched Nd-YAG laser. Also, we demonstrated the resonance Raman spectroscopic measurements of SO2 gas using these tunable deep UV lasers.