[en] Of the techniques described and investigated, coherent anti-Stokes Raman scattering (CARS) and laser Raman scattering (LRS) spectroscopies, the latter method proved to be more amenable to routine measurement of hydrogen isotopic species. It is shown that an available LRS instrument, with some improvements, could attain estimated relative standard deviation reproducibilities of 0.1 to 0.3% for major hydrogen components, an order of magnitude improvement over previously reported laser Raman analytical observations. Gases present at less than 0.1% of a sample could be observable with relative precisions as small as 2.4%. A system designed to obtain these results is proposed and discussed in detail