Helium-neon laser

F., Campbell, Freeman G., Davidson F., and Hanson K. “FTIR Measurements of Mid-IR Absorption Spectra of Gaseous Fatty Acid Methyl Esters at T=25-500??C”, Journal of Quantitative Spectroscopy and Radiative Transfer, 145 (2014): 57-73. https://doi.org/10.1016/j.jqsrt.2014.04.017.