Stimulated vibrational-rotational Raman scattering of hydrogen pumped at a 1064-nm laser

A ∼2.1-µm laser is within an atmospheric transmission window and can be used in remote sensing. In this work, a 1064-nm laser was used as the pump source, pressurized hydrogen was used as the Raman active medium, and a dual-wavelength ∼2.1-µm Raman laser was generated. The 2147-nm laser was generated by a combination processes of stimulated vibrational Raman scattering and stimulated rotational Raman scattering, while a 2132-nm laser was generated by stimulated S-branch vibrational Raman scattering. Optimizing experimental conditions yielded a maximum pulse energy of 76.1 mJ, a peak power of ∼9.2M W, and a photon conversion efficiency of 29.8%.

Compact and movable ozone differential absorption lidar system based on an all-solid-state, tuning-free laser source

The differential absorption lidar (DIAL) has been proposed as an effective method for detecting polluted gases in the atmosphere. In this paper, we present a compact and movable ozone differential absorption (O₃-DIAL) based on an all-solid-state and tuning-free laser source. For the first time, solid-state stimulated Raman scattering technology is used in the emitting source of the lidar for wavelength conversion. A high repetition frequency Innoslab laser is used for pumping SrWO₄ crystals to get yellow lasers which can achieve up to 70% light-to-light conversion efficiency. Our results demonstrate that using the SrWO₄ crystal as the Raman frequency-shifting media of the lidar laser source for obtaining the vertical profiles of tropospheric ozone in the Planetary Boundary Layer (PBL) is a suitable choice. As a compact movable lidar system, the results demonstrate the reliability and stability.