Abstract
In the context of developing the diagnostics of hydrogen in gas mixtures by means of coherent anti-Stokes Raman scattering (CARS) in combination with biharmonic laser pumping by means of stimulated Raman scattering (SRS), the effect of laser pumping power on the SRS-CARS signal in compressed hydrogen has been studied. It is established that an increase in the pumping power at the input of the SRS generator leads to a shift of the CARS signal intensity maximum measured as a function of the gas pressure in the cell. This behavior is probably explained by changes in the positions of energy levels, which are caused by a significant modification of populations in the SRS process at high laser pumping powers.
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