Generation of Coherent XUV Radiation in Gas Mixture of N2 and H2 using High Power Laser System

High harmonic generation is studied in gas species, namely pure H2, pure N2, and their mixture in 1:1 ratio. Observation of harmonic orders from 17H to 35H orders is well resolved. The harmonic spectrum produced from pure H2 is obtained, and the harmonic signal is weaker compared to that produced from pure N2 and their mixture. On the other hand, harmonic yield in the gas mixture is enhanced compared to that from pure H2. The maximum photon energy that harmonic orders can reach is calculated with the well-known cutoff formula. The experiment and the calculation results are in close agreement. In the mixture of N2:H2, the higher harmonics are enhanced compared to the plateau region harmonics. The enhancement of 35H orders in pure N2 or H2-N2 mixture is observed compared to pure H2.