Raman conversion of KrF laser in mixed H2+D2 gas and D2 for tropospheric ozone sounding

UV differential absorption lidar (DIAL) may be used to measure the ozone concentration in troposphere. For this purpose the wavelength in the Hartley band of ozone shorter than 300 nn are commonly used. These DIAL wavelengths have been generated using dye lasers, and Raman shifted quadrupled Nd:YAG or KrF excimer lasers. In the radiation sources for the tropospheric ozone sounding on a base of Raman shifted KrF excimer lasers the commonly used wavelengths are: first Stokes in hydrogen (277 mn), second Stokes in deuterium (292 nn), second Stokes in H₂ (313 nn) and Raman shift in combined D₂ and H₂ cells in series at 302 nn. The authors report for the first time to their knowledge, an efficient Raman conversion of ultraviolet laser in D ₂ and mixed H₂+D₂ gas for tropospheric ozone sounding, respectively. The radiation source was the discharge excimer laser Model 1702(PIC) with an unstable cavity. The output radiation energy for KrF mixture (248 nm) is of 180 mJ and the repetition +ate of 50 Hz. The laser radiation was directed to the Raman cell by the splitter and focused by a 50 cm focal length into the 100 cm long Raman cell filled with hydrogen at 40 atm, deuterium at 44 atm, and mixed (H₂+D₂ GHz:D₂=10:30) gas at 40 atm. The output of Raman cells was directed to the dispersive quartz prisms for spatial separation of the Stokes components